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CTA head & neck now bundled when performed together. 46 new IR codes replaced legacy 37220–37235. AI imaging codes promoted to Category I. Imaging guidance bundled into head/neck embolization — 75894/75898 no longer separately reportable with 61624/61626. 2026 Medicare Conversion Factor: $33.40. XMB monitors all updates in real time.
Radiology medical billing is the process of translating every imaging procedure — X-ray, CT, MRI, ultrasound, nuclear medicine, and interventional radiology — into accurate CPT codes paired with the correct ICD-10 diagnosis that justifies the scan. Because most advanced imaging requires prior authorization before the study is performed, and because radiology is unique in producing two separate billable components (Modifier 26 for the radiologist’s interpretation and Modifier TC for the equipment), it is one of the most technically demanding billing specialties in healthcare. XMB provides HIPAA-compliant radiology billing in all 50 U.S. states with a 99.99% clean claim acceptance rate — with certified coders trained on every modality, every modifier, and every 2026 code change.
Radiology Medical
Billing Services
Every imaging procedure must be translated into the precise CPT code that matches the modality, the body part, the contrast used, and the component performed — before a single claim can be submitted. Add prior authorization requirements, medical necessity documentation, NCCI bundling rules, and 2026 CPT changes, and radiology billing becomes one of the most complex revenue cycles in medicine.
How Radiology Billing Works — Professional vs. Technical Component
Unlike any other specialty, a single imaging study routinely produces two simultaneous claims from two different entities. Getting the PC/TC split right is the single most consequential technical decision in radiology billing.
One Imaging Study — Two Billable Components
Example: MRI Lumbar Spine Without Contrast (CPT 72148) at a hospital, interpreted remotely by an independent radiologist
Radiologist Bills →
- Physician image interpretation
- Clinical judgment & findings
- Written diagnostic report
- Report authentication & signature
- Supervision of technical performance
Hospital / Facility Bills →
- MRI scanner & equipment
- MRI technologist labor
- Contrast agent (if IV given)
- Facility overhead & supplies
- PACS image storage
PC/TC Indicator — Must Be Verified Before Every Modifier Application
| Ind. | Meaning & Billing Rule |
|---|---|
| 0 | Physician Service Only — No split allowed. Bill globally only. Appending -26 or -TC causes automatic denial. |
| 1 | PC/TC Split Supported — Global, -26, or -TC can each be billed. The only indicator that permits component billing. |
| 2 | Technical Component Only — No professional component exists. Appending -26 is not valid. |
| 3 | TC Included in Professional Service — No separate TC billing supported. |
| 4 | Global Service Only — Cannot be split. Appending -26 causes denial. Most E&M and surgical codes carry this indicator. |
Always verify the PC/TC indicator in the current CMS Medicare Physician Fee Schedule before appending any modifier. Indicators can change with annual fee schedule updates.
The PC/TC billing split is what makes radiology billing fundamentally different from every other specialty. Component billing errors — billing global when only the professional component was performed, appending -26 to a code with PC/TC indicator that is not “1,” or billing both -26 and -TC on the same claim line by the same provider — account for approximately 20% of radiology claim denials.
A radiologist who inadvertently submits the global code (without -26) in a split-bill setting may receive the full global payment. When the hospital then submits its -TC claim, one is denied — or a post-payment audit demands recovery of the overpayment, creating False Claims Act exposure under CMS guidelines.
The Place of Service (POS) on a -26 claim must reflect where the patient received the technical service, not where the radiologist sat during interpretation. A teleradiologist reading a hospital scan from a home office still bills POS 21 (inpatient) or POS 22 (outpatient hospital) — not POS 11 (office). This POS error is one of the most common and most avoidable Modifier 26 mistakes. Source: CMS.gov · AAPC.
Prior Authorization by Imaging Modality — 2026 Reference
MRI (All Regions — With Contrast)
Most commercial payers and all Medicare Advantage plans. Requires clinical indication, prior conservative treatment, and referring physician documentation.
CT Angiography
CTA head, neck, chest, abdomen, extremities — auth required from most commercial payers. 2026 CTA head/neck now one bundled study; authorization request must reflect the bundled code.
PET Scan / Nuclear Medicine
PET/CT and nuclear cardiology (SPECT, myocardial perfusion) require universal authorization. Must show failed stress test or specific oncologic/cardiac indication.
High-Cost Interventional IR
Embolization, ablation, biopsy, drainage. 2026 territory-specific IR codes may require updated auth criteria — legacy authorization approvals may not cover new code numbers.
Cardiac MRI
Payers frequently require a prior echocardiogram or nuclear stress test before approving cardiac MRI. Documentation of prior testing must be in the authorization request.
X-Ray & CT Without Contrast
Plain radiography and CT without contrast generally do not require prior authorization. Some payers apply Appropriate Use Criteria (AUC) for CT ordering — verify AUC consultation documentation.
Diagnostic Ultrasound
General abdominal, pelvic, and thyroid ultrasound typically do not require authorization. Echocardiography and specialized cardiac ultrasound are more likely to require auth — verify by payer.
MRI Without Contrast
Authorization requirements for MRI without contrast vary significantly by payer and body region. Brain MRI without contrast for headache may require auth from some commercial payers. Maintain a payer matrix.
Mammography — Diagnostic
Screening mammography is a preventive benefit — generally no auth required. Diagnostic mammography (callback from screening or symptomatic) may require auth from select payers.
What Counts as Contrast in Radiology Billing — And What Does Not
The distinction between “with contrast,” “without contrast,” and “with and without contrast” determines the CPT code tier — and therefore the reimbursement rate. One wrong classification systematically overbills or underbills your entire modality volume.
Without Contrast
Base Reimbursement TierNo contrast agent of any kind administered. Study relies solely on native tissue properties for image acquisition and differentiation.
- No IV, oral, or rectal contrast administered
- CT abdomen without contrast: CPT 74150
- MRI lumbar spine without contrast: CPT 72148
- Appropriate for many routine and follow-up studies
With Contrast
Higher Reimbursement TierIntravenous (IV) contrast agent administered. IV contrast is the ONLY type that qualifies for this code tier.
- IV (intravenous) iodinated or gadolinium contrast only
- CT abdomen with IV contrast: CPT 74160
- MRI brain with contrast: CPT 70553
- Oral or rectal contrast = does NOT qualify — see trap below
With & Without Contrast
Highest Reimbursement TierClinically distinct non-contrast AND IV contrast imaging series, each contributing independently to the diagnostic interpretation.
- Non-contrast baseline images AND IV contrast-enhanced images
- Both phases clinically indicated — not routine single-pass protocol
- CT abdomen w/wo contrast: CPT 74170
- Cannot be used for single-pass protocol with IV contrast given
Oral contrast (barium, Gastrografin) is routinely administered before abdominal CT studies to opacify the GI tract. However, oral contrast does not qualify for the “with contrast” CPT tier. A CT abdomen billed as CPT 74160 (“with contrast”) when only oral contrast was given is a systematic coding error producing denials and compliance exposure across the entire abdominal CT volume. The correct code is 74150 (“without contrast”) when no IV contrast was administered. XMB confirms contrast type from the radiology report before every CT code assignment.
Radiology Services XMB Bills — Every Modality, Every Setting
From a plain chest X-ray to a complex interventional oncology procedure, every imaging service requires precise CPT code selection, contrast classification, modifier application, and prior auth management. XMB handles the full spectrum.
Diagnostic X-Ray
Plain radiography coded by view count and body region. XMB applies Modifier 26 for interpretation-only claims, handles bilateral studies with Modifier 50 or payer-specific laterality codes, and verifies view-count documentation before code selection.
Computed Tomography (CT)
Precise IV-only contrast classification, correct body region, and the 2026 CTA head/neck bundling rule applied. XMB verifies prior authorization for CT with contrast before submission and never bills “with contrast” codes when only oral contrast was administered.
MRI
Three-tier contrast structure organized by body region. XMB applies the new 2026 MRI implant/foreign body safety assessment codes (76014 series) and verifies prior authorization before every contrast-enhanced MRI submission. Cardiac MRI coded separately from standard body MRI.
Ultrasound
Complete vs. limited study distinction with full documentation of elements examined. XMB applies 2026 updated descriptors for duplex scans of extremity veins, handles vascular ultrasound with correct laterality, and codes echocardiography separately from standard body ultrasound.
Nuclear Medicine & PET
PET/CT, SPECT, myocardial perfusion imaging, bone scans, and thyroid scans with 2026 nuclear cardiology code revisions applied. Authorization required for all PET and nuclear cardiology studies. Medical necessity must document failed prior stress test or specific oncologic indication.
Mammography
Screening (77067) vs. diagnostic (77065/77066) billing with distinct coverage rules and co-pay obligations. Digital breast tomosynthesis (DBT) coded at the correct tier. XMB applies Modifier 26 for radiologist interpretation in hospital settings and tracks ACA preventive benefit rules for screening claims.
Interventional Radiology (IR)
In 2026, 46 new territory-based codes (37254–37299) replaced legacy lower-extremity revascularization codes 37220–37235. XMB applies territory-specific codes with operative note requirements and enforces the 2026 rule that bundles imaging guidance into head/neck embolization — 75894/75898 no longer separately reportable with 61624/61626.
AI-Assisted Diagnostic Imaging
AI-assisted imaging codes for lung nodule detection, stroke flagging, and automated mammogram comparison were elevated from Category III to Category I in 2026 with established Medicare RVUs. XMB bills these with required documentation showing how AI output was incorporated into the final interpretation.
Fluoroscopy & Special Procedures
GI fluoroscopy (barium swallow, upper GI, small bowel follow-through), fluoroscopic guidance for interventional procedures, and supervision-and-interpretation (S&I) component billing. XMB applies imaging guidance add-on codes where not bundled and handles the S&I component split correctly.
Major Radiology CPT Changes for 2026 — What Every Imaging Practice Must Know
2026 is one of the most significant years for radiology coding changes in recent history. These are not minor updates — several fundamentally alter how the most frequently billed studies are coded.
AI-Assisted Imaging: Category III → Category I
AI tools for lung nodule detection on chest CTs, stroke sign flagging on brain scans, and automated prior mammogram comparison are now Category I CPT codes with established Medicare RVUs — meaning reimbursement is defined rather than carrier-determined. Documentation must show how AI output was incorporated into the final interpretation. Billed separately from the underlying imaging CPT code. Payers may audit AI documentation at any time.
XMB Action: New Category I AI codes added to charge capture with documentation tracking per study.
CTA Head + CTA Neck Now Bundled When Performed Together
CTA head (70496) and CTA neck (70498) performed in the same session are now a single bundled code for most payers — billing both separately violates 2026 NCCI edits. The separate codes remain available when studies are performed independently (not the same session) and for payers that still allow individual reporting. Prior authorizations submitted as separate codes may need to be resubmitted as the bundled study.
XMB Action: CTA head/neck order sets updated. Payer-specific exceptions checked before separate billing.
Territory-Based IR Codes Replace Legacy 37220–37235
New codes 37254–37299 require documentation of specific vascular territory treated. Template operative notes that do not specify vascular territory generate widespread IR claim denials. Each new code distinguishes modality (angioplasty vs. stent), vessel territory, and anatomic level. Legacy codes 37220–37235 are retired. Prior authorizations obtained under old code numbers may not apply to new codes — re-verification recommended.
XMB Action: All 46 new IR codes mapped. Operative note templates reviewed for vascular territory documentation.
6 New MRI Implant / Foreign Body Safety Assessment Codes (76014 Series)
New Category I codes for MRI safety evaluations of patients with implants or foreign bodies — cardiac devices, cochlear implants, metallic fragments. CPT 76014 covers the initial 15-minute assessment with add-on time codes for extended evaluation. These address the growing complexity of MRI safety screening before imaging approval. Documentation must record the implant type, manufacturer, model number, and MRI conditional status.
XMB Action: 76014 series added to charge capture workflows with required implant documentation standards.
Imaging Guidance Bundled into Embolization Codes 61624/61626
All radiological supervision and interpretation, intraprocedural roadmapping, and imaging guidance are fully bundled into head/neck embolization codes 61624 and 61626. Codes 75894 and 75898, while still in the CPT manual, are no longer separately reportable alongside these procedures. Billing them as add-ons constitutes unbundling and causes denial. No modifier allows separate billing of 75894/75898 with 61624/61626.
XMB Action: Embolization charge capture updated — 75894/75898 removed from bundled procedure sets.
2026 Medicare Conversion Factor: $33.40
The 2026 Medicare Physician Fee Schedule conversion factor is $33.40, applied to all radiology CPT codes. Total reimbursement = (Work RVUs + Practice Expense RVUs + Malpractice RVUs) × $33.40 × GPCI locality adjustment. XMB uses current RVU values to set accurate reimbursement benchmarks and flag claims where billed amounts fall outside expected payment ranges based on the 2026 fee schedule.
XMB Action: All radiology fee schedules updated with 2026 CF and revised RVU values effective January 1.
The 6 Key Modifiers in Radiology Billing — Correctly Applied Every Time
Modifier errors account for a significant share of radiology denials. Each modifier has a specific clinical and billing trigger — using the wrong one, or omitting the required one, creates both revenue loss and compliance exposure.
Professional Component
Applied when the radiologist provides only interpretation and written report for an imaging study on equipment owned by a separate facility. PC/TC indicator “1” required. Must appear in modifier position 1. POS reflects the patient’s scan location — not the radiologist’s reading location.
Example: Teleradiologist interprets a hospital MRI → bill CPT-26 with POS 22 (outpatient hospital), not POS 11 (office).
Technical Component
Applied by the facility owning the equipment to bill for scanner, technologist, supplies, and overhead — without the professional interpretation. PC/TC indicator “1” required. One provider cannot bill both -26 and -TC for the same patient on the same date.
Example: Hospital performs MRI; radiologist bills -26 → hospital bills the same CPT-TC. Combined payments = global rate.
Distinct Procedural Service
Indicates two same-day procedures are separate, distinct services not subject to NCCI bundling edits. Used in radiology when multiple imaging studies have genuinely independent clinical indications and are not part of the same diagnostic session.
Example: Chest CT and abdominal CT for unrelated clinical indications on the same day → Modifier 59 on the second study with independent clinical documentation.
Bilateral Procedure
Applied when the same imaging study is performed on both sides of the body in the same session. Medicare generally accepts Modifier 50; many commercial payers require separate line items with -RT and -LT instead. Verify payer preference before submission.
Example: Bilateral knee X-rays → bill with Modifier 50 for Medicare. Commercial payers may require two separate line items with -RT and -LT.
Repeat by Another Physician
Applied when an imaging study is performed a second time on the same date by a different physician than the original. Prevents automatic duplicate claim denial. In position 2 when -26 is also present, since -26 must always appear in position 1.
Example: Same-day second radiologist interpretation → bill CPT-26 in position 1, -77 in position 2.
Reduced Services
Applied when a service is partially reduced at physician discretion. In radiology, used when a multi-view study is completed with fewer views than the code descriptor specifies, or when an imaging session is clinically interrupted before completion.
Example: Four-view chest series billed but only three views obtained → bill the four-view CPT with Modifier 52 and document clinical reason for reduced views.
Top 7 Radiology Billing Denial Reasons & CPT Code Reference
Top 7 Radiology Billing Denial Reasons
The patterns responsible for the majority of radiology claim rejections in 2026 — and how XMB prevents each one.
- 1Missing or Incorrect Modifier 26 / TCBilling global when only the professional component was performed; appending -26 to a code with PC/TC indicator not “1”; billing -26 and -TC on the same claim line by the same provider. Accounts for ~20% of radiology denials and creates False Claims Act exposure when global is billed incorrectly in split-bill settings.
- 2Contrast Misclassification — Oral Counted as IVBilling “with contrast” codes (74160, 70553, etc.) when only oral or rectal contrast was administered. Systematic oral contrast miscoding creates both denial exposure and OIG compliance risk across the full abdominal CT billing pattern.
- 3Missing Prior Authorization for Advanced ImagingNo authorization obtained before MRI with contrast, CT angiography, PET scan, or nuclear medicine study. Full claim denial with no recovery path without formal appeal. The most preventable and most financially damaging radiology denial cause.
- 42026 NCCI Bundling ViolationsCTA head (70496) and CTA neck (70498) billed separately in the same session. Codes 75894/75898 billed alongside 61624/61626. Legacy IR codes 37220–37235 submitted instead of the new territory-based 37254–37299. Each violation triggers automatic denial.
- 5Non-Specific ICD-10 Codes Failing Medical NecessityUsing unspecified codes (R91.8 — other abnormal lung findings) when specific codes exist (R91.1 — solitary pulmonary nodule). The ordering diagnosis must match the clinical scenario and justify why imaging — rather than a less expensive workup — is appropriate.
- 6Modifier Sequencing ErrorsModifier -26 or -TC must appear in position 1 when multiple modifiers apply. Placing these in position 2 behind other modifiers causes payment reductions or denials depending on the payer’s sequential adjudication logic.
- 7POS Mismatch on Modifier 26 ClaimsPlace of Service must reflect the patient’s scan location, not where the radiologist sat during interpretation. A teleradiology read of a hospital inpatient scan billed as POS 11 (office) triggers automatic denial or underpayment across all payers.
Radiology CPT Code Quick Reference (2026)
| Code | Description |
|---|---|
| Chest X-Ray | |
| 71046 | Chest X-ray, 2 views (PA and lateral) |
| 71047 | Chest X-ray, 3 views |
| 71048 | Chest X-ray, 4 or more views |
| CT — Head/Neck (2026) | |
| 70450 | CT head/brain — without contrast |
| 70460 | CT head/brain — with IV contrast only |
| 70471 | CTA head and neck combined 2026 Bundle |
| CT — Abdomen/Pelvis | |
| 74150 | CT abdomen — without contrast |
| 74160 | CT abdomen — with IV contrast only |
| 74177 | CT abdomen and pelvis — with contrast |
| 74178 | CT abdomen and pelvis — without and with contrast |
| MRI (2026 Updates) | |
| 70551 | MRI brain — without contrast |
| 70553 | MRI brain — without and with contrast |
| 72148 | MRI lumbar spine — without contrast |
| 76014 | MRI implant/foreign body safety assessment New 2026 |
| Ultrasound & Mammography | |
| 76700 | Ultrasound abdomen — complete |
| 76536 | Ultrasound soft tissue neck (thyroid/parathyroid) |
| 93880 | Duplex scan carotid arteries — bilateral |
| 77067 | Screening mammography, bilateral |
| 77066 | Diagnostic mammography, bilateral |
| Nuclear Medicine & PET | |
| 78452 | Myocardial perfusion SPECT — multiple studies |
| 78816 | PET scan — skull base to mid-thigh |
| Interventional Radiology (2026) | |
| 37254–37299 | New territory-based lower extremity revascularization New 2026 |
| 61624 | Head/neck embolization — imaging guidance bundled |
| 77012 | CT guidance — needle placement/biopsy |
Source: AAPC · CMS MPFS 2026 · Radiology Today 2026. Verify current PC/TC indicators in MPFS before every modifier application.
How XMB Handles Radiology Billing — Step by Step
From your first onboarded day to your monthly performance report, here is exactly how XMB manages the radiology revenue cycle.
Free Practice Assessment
XMB audits your Modifier 26/TC usage, contrast classification, prior authorization workflows, 2026 bundling patterns, and denial history before the first claim is submitted.
RIS/EHR Integration
Integration with your radiology information system — Epic, PowerScribe, Merge, Ambra, Intelerad — with no disruption to radiologist workflow or reporting processes.
Modality-Accurate Coding
Certified coders verify PC/TC indicator before every modifier application, confirm contrast type from the radiology report (IV only), apply 2026 bundling rules, and sequence modifiers with -26/-TC in position 1.
Prior Auth Management
Authorization verified through eviCore, AIM Specialty Health, Carelon, and payer portals before advanced imaging dates of service. Auth numbers documented and expiration dates tracked.
Denial Management & Appeals
All denied claims worked within 48 hours. Appeals drafted with clinical indication, AUC documentation, and NCCI compliance evidence. Monthly denial trend analysis provided.
Radiology Billing: In-House Staff vs. XMB
Radiology billing demands technical knowledge — from PC/TC indicator verification to 2026 bundling changes — that generalist billing staff typically lack. The financial gap is measurable.
| Factor | In-House / Generalist Biller | XMB — Xecta Medical Billing |
|---|---|---|
| Modifier 26 / TC Accuracy | PC/TC indicator not verified — wrong modifier or global billed in split-bill settings | PC/TC indicator verified in MPFS before every modifier application |
| Clean Claim Rate | 79–86% (radiology specialty average) | 99.99% |
| Contrast Classification | Oral contrast miscounted as IV — systematic “with contrast” overcoding | Contrast type confirmed from radiology report — IV only qualifies |
| Prior Authorization Management | Manual tracking — authorizations missed for advanced imaging before DOS | Pre-service auth verified through eviCore/AIM/Carelon before every advanced imaging date |
| 2026 Bundling Compliance | Legacy codes and separate billing patterns cause 2026 NCCI denials | CTA bundled, new IR codes, embolization guidance bundled — all 2026 changes implemented |
| POS on Modifier 26 Claims | POS 11 (office) used for teleradiology reads of hospital studies | POS always reflects patient scan location, not radiologist reading location |
| Modifier Sequencing | -26/-TC placed in position 2 — triggers payment reduction or denial | -26/-TC always in modifier position 1 on every claim |
| 2026 AI Imaging Category I Codes | New codes not yet captured — revenue left on the table | All new Category I AI imaging codes added with documentation tracking |
| Monthly Billing Cost | $5,000–$8,000+/mo salary + benefits | Performance-based % of collections only |
| Long-Term Contract Required | N/A | No fixed contract — cancel any time |
Who XMB’s Radiology Medical Billing Is For — And Who It Is Not For
XMB Is Right For Your Practice If You Are:
- A radiology practice, imaging center, teleradiology group, or hospital radiology department in any U.S. state
- Experiencing a denial rate above 5% or incorrect reimbursements from Modifier 26/TC errors
- Not confident your contrast classification distinguishes IV from oral contrast for every CT code
- Still using legacy IR codes 37220–37235 instead of the 2026 territory-based 37254–37299
- Losing prior authorization denials for advanced imaging because auth wasn’t obtained pre-service
- A teleradiology group billing POS 11 instead of the patient’s scan location on -26 claims
- An interventional radiologist navigating the 2026 embolization bundling changes
- Any imaging center that hasn’t yet added the new 2026 AI-assisted Category I codes to charge capture
XMB May Not Be the Right Fit If You:
- Operate exclusively under DRG-based facility payments that cover all imaging globally
- Need in-person, on-site billing staff embedded at your physical imaging facility
- Are looking for a one-time billing audit only — not ongoing billing management
- Are seeking a RIS or billing software product rather than a full-service billing company
Radiology Medical Billing — Questions Radiology Practices Ask XMB
What is the difference between Modifier 26 and Modifier TC in radiology billing?
Modifier 26 (Professional Component) is appended when a radiologist provides only the interpretation and written report of an imaging study performed on equipment owned by a separate facility. The facility simultaneously bills Modifier TC (Technical Component) for the equipment, technologist, and overhead. Both payments combined must equal — but not exceed — the global rate. If one entity provides both components, the global code is billed without any modifier. Before appending either modifier, the CPT code’s PC/TC indicator must be verified in the CMS Medicare Physician Fee Schedule — only codes with indicator “1” support component billing. A radiologist who inadvertently submits the global code instead of -26 receives the full global payment; when the hospital then submits -TC, one claim is denied or a post-payment audit demands recovery, creating False Claims Act exposure. See our medical billing services.
What counts as contrast for radiology billing purposes in 2026?
For CPT coding, contrast means intravenous (IV) contrast agent only. Oral contrast (barium, Gastrografin) and rectal contrast do NOT qualify for the higher-paying “with contrast” code tier, regardless of how frequently they are used in abdominal imaging protocols. A CT abdomen billed as CPT 74160 (“with contrast”) when only oral contrast was given is a systematic coding error that produces denials and compliance exposure across the entire abdominal CT billing volume. The correct code is 74150 (“without contrast”) when no IV contrast was administered. When both non-contrast baseline images and IV contrast-enhanced images are obtained as clinically distinct series in the same session, the “without and with contrast” code tier applies — but this cannot be used simply because a standard protocol includes both phases as a single scan pass with IV contrast given.
Which radiology procedures require prior authorization in 2026?
Most commercial payers and all Medicare Advantage plans require prior authorization for MRI with contrast (all body regions), CT angiography, PET/CT, nuclear cardiology (SPECT, myocardial perfusion), cardiac MRI, and high-cost interventional procedures. CT without contrast and general ultrasound generally do not require authorization. Authorization requests are processed through Radiology Benefit Management companies — eviCore, AIM Specialty Health, and Carelon — each with distinct clinical criteria. The 2026 CMS rule requires Medicare Advantage plans to respond within 72 hours for standard requests and 24 hours for expedited requests. Missing or expired authorization before imaging is one of the fastest and most complete causes of full claim denial in radiology. XMB manages pre-service authorization for every advanced imaging study. See our Revenue Cycle Management services.
What were the major radiology CPT code changes for 2026?
The major 2026 radiology CPT changes include: (1) CTA head and CTA neck bundled into a single code when performed together — billing 70496 and 70498 separately in the same session is now an NCCI violation; (2) 46 new territory-based interventional radiology codes (37254–37299) replaced legacy lower-extremity revascularization codes 37220–37235; (3) AI-assisted diagnostic codes elevated from Category III to Category I with established Medicare RVUs for lung nodule detection, stroke flagging, and automated mammogram comparison; (4) 6 new MRI implant/foreign body safety assessment codes (76014 series); and (5) imaging guidance bundled into head/neck embolization codes 61624/61626 — codes 75894 and 75898 are no longer separately reportable with these procedures. Source: Radiology Today 2026 Coding Update · AAPC.
What are the most common radiology billing denial reasons?
The top radiology denial causes in 2026 are: (1) missing or incorrect Modifier 26/TC — billing global when only one component was performed, or appending -26 to a code without PC/TC indicator “1”; (2) contrast misclassification — oral contrast counted as IV; (3) missing prior authorization for advanced imaging before the date of service; (4) 2026 NCCI bundling violations — CTA head/neck billed separately, 75894/75898 billed alongside 61624/61626, legacy IR codes 37220–37235 still submitted; (5) non-specific ICD-10 codes that fail medical necessity review; (6) modifier sequencing errors — -26 or -TC must appear in position 1; and (7) POS mismatch on Modifier 26 claims — POS must reflect the patient’s scan location, not the radiologist’s reading location. XMB’s radiology-specific billing workflow is engineered to prevent all seven before any claim is submitted.
Radiology Billing Demands 2026 Code Precision and Pre-Service Auth — Not Last Year’s Workflow
Get a free, no-obligation practice assessment. XMB will audit your Modifier 26/TC usage, contrast classification accuracy, prior authorization compliance, 2026 bundling adherence, and denial patterns — and show you exactly where your practice is exposed, starting within 14 days.