Radiology Billing Specialists
Modifier -26 vs. -TC vs. global. MPPR sequencing. IR S&I code stacking. Teleradiology POS codes. MRI/CT prior authorization. Radiology billing is modifier-and-modifier-rule intensive — Healix's imaging billing team handles every variable on every claim.
Why Radiology Billing Requires the Most Precise Modifier Logic of Any Specialty
No other specialty has a billing model where the same CPT code must be billed three different ways depending on who owns what equipment — as global, professional, or technical. Getting modifier selection wrong on high-volume radiology claims is a compliance exposure, not just a billing error.
Add interventional radiology's multi-code stacking, MPPR sequencing mathematics, teleradiology POS complexity, and prior authorization specificity requirements — and radiology becomes one of the most technically demanding billing specialties in medicine. Healix has a dedicated radiology billing team with experience across diagnostic imaging, IR, and teleradiology operations.
- We map every reading arrangement and apply the correct modifier — global, -26, or -TC — automatically.
- We sequence multi-study claims by descending RVU to maximize revenue under MPPR rules.
- We capture every IR S&I code from the procedure note using our IR code-pairing library.
- We obtain prior authorizations with exact CPT code specificity — eliminating mismatch denials.
- We assign correct POS codes to teleradiology professional claims based on originating facility.
Six Radiology Billing Complexity Factors
1Professional Component (-26) vs. Technical Component (-TC) vs. Global — the Modifier That Determines Everything
Radiology is the only specialty where a single imaging study can generate two completely separate claims from two different billing entities. The technical component (equipment, technologist, facility overhead) is billed by the imaging center or hospital with modifier -TC. The professional component (physician interpretation and signed report) is billed by the reading radiologist with modifier -26. When a radiologist owns the imaging equipment and reads their own images, the global code is billed without modifiers. Misidentifying which arrangement applies to each encounter — and which modifier belongs on which claim — is the most common radiology billing error, causing duplicate payment flags, compliance exposure, and denials from every payer.
2MPPR (Multiple Procedure Payment Reduction) — Sequencing Determines How Much You Get Paid
When multiple imaging studies are performed on the same patient on the same date of service, Medicare and most commercial payers apply the Multiple Procedure Payment Reduction: the highest-valued procedure (by RVU) pays at 100%, and each additional procedure from the same imaging family is discounted 25–50% on the technical component. The critical rule: the order CPT codes are listed on the claim determines which code is primary (paid at 100%) and which are secondary (discounted). A claim listing 74178 (CT abdomen/pelvis) before 74177 (CT abdomen) leaves money on the table if 74178 has a higher RVU. Healix's billing platform automatically sequences codes by RVU value to maximize reimbursement under MPPR rules.
3Interventional Radiology Multi-Code Stack — Procedure + Imaging Guidance + S&I
Interventional radiology procedures generate 3–8 separately billable codes in a single operative session: (1) the base therapeutic procedure (e.g., 36247 selective catheter placement, third order), (2) the angiography or fluoroscopy supervision and interpretation code (S&I code — e.g., 75726), (3) additional catheter position codes if the catheter was advanced to multiple vessels, (4) the therapeutic intervention code (stent placement 37221, balloon angioplasty 37220), and (5) any device HCPCS codes. Missing the S&I code alone costs $300–$800 per IR procedure. Healix's IR-specialized coders capture every component from the procedure note, generating the complete code set that most practices miss.
4Prior Authorization for Advanced Imaging — eviCore, AIM, and Payer-Specific Decision Trees
CT, MRI, and PET studies increasingly require prior authorization through radiology benefits managers (RBMs) — eviCore, AIM Specialty Health, National Imaging Associates. Each RBM uses its own clinical decision-support algorithm based on ACR Appropriateness Criteria, and studies ordered without proper authorization are denied automatically. The authorization request must include: the specific CPT code being authorized, the relevant ICD-10 diagnosis, relevant clinical history, and often prior imaging results. Authorizations obtained for the wrong CPT code or wrong body part are also denied. Healix manages the full auth workflow for all advanced imaging, with a 96.8% first-attempt approval rate.
5Teleradiology Professional Fee Billing — Multi-Site, Multi-State, Multi-Payer
A teleradiology group reading images for 40+ facilities across multiple states must manage: state licensure compliance for each radiologist (reading cross-state requires licensure in the patient's state), credentialing at each facility with every payer, place of service code selection (the POS code is the location of the patient, not the radiologist), separate modifier -26 on every professional component claim, and revenue reconciliation with each facility's technical billing. A single radiologist misidentified as having POS 11 (office) instead of the correct hospital POS causes every claim to pay at the wrong fee schedule — a systematic error that can cost tens of thousands of dollars before it's identified.
6Contrast Media — Code Selection, Not Separate Billing
For CT and MRI, the use of contrast is built into the CPT code selection — not separately billed in most settings. CT abdomen without contrast (74150), with contrast (74160), and without followed by with contrast (74170) are three entirely different codes that carry different reimbursement rates. Selecting the wrong contrast variant on the claim is a direct misstatement of the service provided. For MRI brain, 70551 (without), 70552 (with), and 70553 (without and with) follow the same logic. In certain ASC or physician-owned imaging settings, HCPCS codes for specific high-osmolar or low-osmolar contrast agents may be separately billable — a revenue opportunity most practices miss.
Imaging Codes With the Highest Billing Error Rates — and the Revenue Impact
Each row represents a systematic billing gap that Healix's radiology billing team prevents on every claim.
| CPT Code | Description | Common Billing Error |
|---|---|---|
| 74177 | CT abdomen and pelvis, with contrast — highest volume CT code billed | Billed without contrast modifier context or sequenced after lower-RVU codes — MPPR applied incorrectly, reducing payment |
| 70553 | MRI brain, without contrast followed by with contrast — most comprehensive brain MRI | Billed as 70552 (with contrast only) when both pre- and post-contrast sequences were performed — undercoding by one code level |
| 77067 | Screening mammography, bilateral — Medicare covers annually for women 40+ | Frequency limit exceeded — two bilateral mammos billed in same calendar year without documentation of diagnostic indication for second study |
| 75726 | Angiography, visceral, bilateral — S&I code for IR vascular procedure | Omitted entirely from IR claims — the S&I code is a separately billable component worth $300–$800 that requires only documentation in the procedure note |
| 36247 | Selective catheter placement, third order abdominal/pelvic artery branch | Billed as 36245 (first order) when catheter advanced to third-order vessel — each vessel selection level is separately billable |
| 93306 | Echocardiography, transthoracic, complete — used in radiology and cardiology | Global code billed by hospital imaging center when cardiologist interprets — should be TC (hospital) and -26 (cardiologist) separately |
| 71046 | Chest X-ray, 2 views — most common radiology procedure; billed as global or components | Global code billed when radiologist reads hospital inpatient X-ray — should be modifier -26 professional only; causes duplicate claim flag |
| 78816 | PET/CT whole body, including attenuation correction — requires prior authorization | Submitted without prior authorization or with wrong diagnosis code on the auth — denied automatically then difficult to appeal retroactively |
Why Radiology Claims Are Denied — and the Exact Resolution
These five denial patterns account for 90%+ of all radiology and imaging center claim denials.
Wrong Modifier — Global Code Billed When Only Professional Component Performed
The most common radiology billing error: a radiologist reads images from a hospital or freestanding imaging center they do not own and bills the global CPT code (no modifier) instead of modifier -26 (professional component only). The payer sees a global claim from the radiologist and a technical claim from the facility — triggering a duplicate payment investigation and denying one or both claims. Alternatively, the wrong modifier is used (-TC on a professional claim or -26 on a facility claim). Healix maps every radiologist's reading arrangement at onboarding — which sites they own, which they read by contract — and applies the correct global/-26/-TC modifier automatically.
MRI or CT Prior Authorization Missing or Wrong CPT Code on Auth
Commercial plans and Medicare Advantage plans require prior authorization for MRI, CT, and PET studies through their RBM. If the authorization was obtained for CPT 74177 (CT abdomen/pelvis with contrast) but the claim is billed with 74178 (CT abdomen/pelvis without and with contrast), the authorization doesn't match and the claim is denied — even though the auth was obtained and the study was medically necessary. Similarly, authorizations for the wrong body region (brain vs. abdomen) are common when front-desk staff process auth requests without radiology coding expertise. Healix's auth team verifies CPT code specificity at the time of authorization, not after.
IR S&I Code Missing — Supervision and Interpretation Not Billed
Interventional radiology procedures are accompanied by imaging supervision and interpretation (S&I) codes that are separately billable from the base procedure code. For a renal artery angioplasty, the procedure code (37220) is accompanied by the angiography S&I code (75962). Both must be on the claim. Practices that don't know the IR code pairing rules submit only the procedure code and miss $300–$800 per procedure. In Healix's analysis, 28% of IR procedures submitted by practices new to our service were missing at least one S&I code. Our IR-trained coders apply the correct S&I pairing from a curated procedure-to-S&I mapping table.
MPPR Sequencing Error — Lower-RVU Code Listed First
When multiple imaging studies are performed on the same patient on the same date, CMS's Multiple Procedure Payment Reduction (MPPR) applies a 50% reduction to the technical component of all secondary procedures. The claim system pays the first code listed at 100% and discounts all others. If your billing team lists a lower-RVU study first, the payer reduces payment on the higher-value study — overpaying on the less valuable one and underpaying on the more valuable. The cumulative effect across a high-volume imaging center with 100+ multi-study days per month is significant. Healix's claim engine automatically resequences multi-study claims by descending RVU value.
Teleradiology Place of Service Error — Wrong POS Code on Professional Claim
The Place of Service (POS) code on a professional radiology claim must reflect where the patient received the imaging service — not where the radiologist was physically located. A teleradiologist reading from their home or a remote reading station who applies POS 11 (office) to a study performed at a hospital outpatient department (POS 22) causes the claim to pay at the lower physician office fee schedule instead of the higher facility-based rate. For hospitals, this difference can be $30–$120 per read. Accumulated across thousands of reads per month in a teleradiology practice, this sequencing mistake costs hundreds of thousands annually.
Three Revenue Opportunities Most Radiology Practices Are Not Fully Capturing
Interventional radiology expansion, teleradiology professional fees, and contrast supply billing represent significant revenue available to most imaging practices with the right billing infrastructure.
Interventional Radiology Expansion
CPT 36000–37799 (Vascular) + 47000–47015 (Biopsies) + S&I Codes
Interventional radiology procedures — renal artery angioplasty, hepatic embolization, vertebroplasty, PICC line placement, paracentesis, thoracentesis — reimburse significantly higher than diagnostic imaging and are growing in demand. A radiologist group that transitions 2–3 diagnostic radiologists into IR capability and adds an IR procedure suite can add $600,000–$1.2M in annual revenue. The billing complexity of IR (multi-code stacking, S&I pairs, catheter selection levels) is exactly where Healix's IR-specialized billing team delivers the most value — capturing the full code set that most general billing companies miss.
Teleradiology Professional Fee Contracts
Modifier -26 on All Remote Reads — Per-Study Professional Fee Billing
A radiologist group executing teleradiology reading contracts for community hospitals, rural critical access hospitals, and urgent care centers can generate significant professional fee revenue at scale. A 15-radiologist group reading 1,200 studies per day across 40 facilities — all billed correctly with modifier -26, correct POS codes, and payer-specific fee schedules — generates $7M–$12M annually in professional component revenue. The critical variable is billing infrastructure: correct modifier application, per-facility credentialing, per-state licensure tracking, and payer-specific contract rates. Healix manages the entire teleradiology billing operation for groups of any size.
Contrast Agent & Supply Separate Billing
HCPCS Q-Codes / A-Codes for Contrast Agents in Applicable Settings
In physician-owned imaging centers and ASC settings, certain contrast agents may be separately billable using HCPCS codes — in addition to (not instead of) the contrast-inclusive CPT code. For example, in a freestanding imaging center billing globally, high-cost gadobutrol (Gadavist), gadoteridol (ProHance), or iodinated contrast for CT may be separately billed with applicable HCPCS Q-codes under certain payer contracts. This opportunity is highly payer-specific but can add $50,000–$200,000 annually to an imaging center's revenue without changing imaging volume. Healix audits each practice's payer contracts for contrast supply billing provisions during the onboarding revenue audit.
Our Radiology Billing Process
A modifier-aware, IR-specialized billing workflow that starts with reading arrangement mapping and ends with denial appeals — built for imaging centers, radiology groups, and teleradiology practices.
Component Assignment — Global vs. -26 vs. -TC
At onboarding, we map every reading radiologist's arrangement with every facility — owned, contracted, teleradiology. Each claim is automatically assigned the correct modifier (global, -26, or -TC) based on this map, eliminating the #1 radiology billing error before claims are submitted.
Prior Authorization Management
We manage the full auth workflow for CT, MRI, and PET — including CPT-code-specific authorization requests, clinical documentation packages, and RBM portal submissions (eviCore, AIM, NIA). Authorization is obtained with the exact CPT code that will be on the claim — eliminating code-mismatch denials.
IR Code-Stack Capture
Every interventional radiology procedure note is reviewed by an IR-trained coder. We apply our IR procedure-to-S&I mapping table and capture all catheter selection codes, therapeutic intervention codes, and supervision & interpretation codes — generating the full billable code set from a single procedure.
MPPR Sequencing & Claim Scrubbing
Multi-study claims are automatically sequenced by descending RVU to maximize revenue under MPPR rules. All claims are scrubbed against radiology-specific NCCI edits, contrast variant code accuracy, bilateral procedure modifiers, and frequency limit rules before submission.
Denial Appeals & Payment Reconciliation
Component coding denials and auth-mismatch appeals are resolved within 48 hours with documentation packages. For teleradiology practices, we reconcile professional fee collections against facility technical billing reports — detecting discrepancies before they age into write-offs.
Radiology Billing Results We Deliver
Measured outcomes from imaging centers, radiology groups, and teleradiology practices in their first 90 days with Healix.
Radiology-specific RIS/PACS and dictation platforms we integrate with natively
Radiology Billing FAQs
Expert answers to the billing questions radiology practices, imaging center administrators, and teleradiology directors ask us most.
QWhat is the difference between modifier -26, modifier -TC, and global radiology billing?
In radiology, every imaging study has two components: the technical component (TC) — the equipment, technologist, room, and supplies — and the professional component (-26) — the physician's interpretation, dictation, and signed report. When the radiologist and the imaging equipment are owned by the same entity (e.g., a private practice imaging center where the radiologist owns both the equipment and performs the reads), the global code is billed without any modifier, and one payment covers both components. When the components are split between entities — for example, a hospital owns the CT scanner (TC) and a teleradiology group reads the images (-26) — each entity submits a separate claim with the appropriate modifier. Using the wrong modifier, or billing global when only one component was provided, triggers duplicate payment investigations and compliance reviews. Healix maps every reading arrangement at onboarding to ensure the correct modifier is applied on every claim.
QHow does the Multiple Procedure Payment Reduction (MPPR) work in radiology?
MPPR is a CMS and payer policy that applies payment reductions when multiple imaging procedures from the same family are performed on the same patient on the same date. The procedure with the highest work RVU (Relative Value Unit) is paid at 100%. Each additional procedure in the same imaging family receives a 50% reduction on the technical component (the professional component is typically not reduced for diagnostic imaging). The critical operational detail is sequencing: your billing software must list the codes in descending RVU order — highest RVU first — to ensure the most valuable study receives the full 100% payment. If your team lists studies in the order they were performed (which may not be RVU order), you may be systematically underpaid on your highest-value studies across thousands of multi-study dates per year. Healix's claim engine automatically resequences every multi-study claim by descending RVU before submission.
QWhat are S&I codes in interventional radiology, and why are they so often missed?
Supervision and Interpretation (S&I) codes are radiology procedure codes in the 75000–75999 CPT range that accompany interventional radiology procedures and represent the imaging guidance (fluoroscopy, angiography, ultrasound) provided during the intervention. When a radiologist places a drainage catheter, the procedure code (e.g., 49405 — image-guided fluid collection drainage, percutaneous) is accompanied by an S&I code for the imaging used to guide the procedure (e.g., 76942 — ultrasonic guidance for needle placement). Each S&I code requires a separately documented imaging interpretation in the procedure note. They are frequently missed because general billers don't know the procedure-to-S&I pairing rules, and IR physicians document the procedure note without billing implications in mind. Healix's IR team uses a procedure-to-S&I mapping table to ensure every billable imaging component is captured from the operative note.
QHow does prior authorization work for MRI and CT scans?
Most commercial payers and Medicare Advantage plans route MRI, CT, PET, and nuclear medicine authorization requests through a Radiology Benefits Manager (RBM) — the major ones being eviCore Healthcare, AIM Specialty Health (Anthem), National Imaging Associates (NIA/Magellan), and HealthHelp. Each RBM uses its own clinical decision-support algorithm based on ACR Appropriateness Criteria to determine whether the requested study is appropriate for the clinical indication. The authorization request must include: (1) the exact CPT code being requested — authorization for 74177 does not cover 74178; (2) the ICD-10 diagnosis with relevant specificity (e.g., M54.42 for lumbago vs. M54.50 for low back pain — some payers accept one but not the other); (3) clinical history and relevant prior imaging; and (4) for certain studies, documentation of failed conservative treatment. Healix pre-screens every advanced imaging order before scheduling, submits auth requests with CPT-code-specific clinical packages, and achieves a 96.8% first-attempt approval rate.
QWhat is the correct way to bill a teleradiology professional fee?
A teleradiologist reading images remotely for a hospital or imaging center bills the professional component only (modifier -26). The Place of Service (POS) code on the claim must reflect where the patient was imaged — not where the radiologist was reading. If the patient was imaged at a hospital outpatient department, POS 22 applies to the professional claim, which triggers the facility-based physician fee schedule rate. If the radiologist mistakenly uses POS 11 (office), the claim pays at the non-facility rate, which is lower for most imaging procedures. Additionally, the radiologist must be credentialed with the payer at the originating facility's location, and if reading across state lines, must hold a license in the patient's state. For teleradiology groups reading at multiple facilities, Healix maintains a per-facility credentialing and POS code library that is applied automatically to every professional claim based on the originating facility NPI.
QHow does contrast media affect CT and MRI billing — can we bill it separately?
For most diagnostic CT and MRI studies, contrast usage is reflected in the CPT code selection rather than being separately billable. CT abdomen has three codes: 74150 (without contrast), 74160 (with contrast), and 74170 (without and with contrast — a 'triple-phase' or 'with and without' protocol). Similarly, MRI brain uses 70551 (without), 70552 (with), or 70553 (without and with). Selecting the wrong contrast variant is both a compliance issue and a revenue issue — 74170 reimbursement is higher than 74160, which is higher than 74150. In certain settings — specifically physician-owned freestanding imaging centers billing under the global fee — HCPCS Q-codes for specific contrast agents may be separately billable under some commercial payer contracts. This is highly payer-specific, and Healix audits each practice's payer contracts during onboarding to identify any contrast supply billing provisions that are being missed.
QWhat are the most common radiology billing mistakes and how do you prevent them?
The most costly radiology billing errors are: (1) Wrong modifier or global code when only one component was provided — component mismatch causes duplicate payment investigations. (2) Prior auth obtained for wrong CPT code — auth for 74177 doesn't cover 74178, causing automatic denial. (3) Missing S&I codes on IR procedures — worth $300–$800 per procedure. (4) Multi-study MPPR sequencing error — listing lower-RVU code first causes higher-value study to be discounted. (5) Wrong POS code on teleradiology professional claims — causes fee schedule underpayment. (6) Contrast variant code error — wrong with/without/with-and-without selection. (7) Frequency limit exceeded on screening mammography — not tracking prior studies. (8) Catheter selection code understated in IR — billing first-order when third-order was reached. Healix prevents all eight through systematic pre-submission claim scrubbing, IR code-stacking review, and multi-study RVU sequencing.
QDoes Healix handle billing for both the radiology group and the imaging facility separately?
Yes — Healix can manage both the professional fee billing (for the radiologist group) and the technical fee / facility billing (for the imaging center or hospital outpatient department) either separately or in a coordinated arrangement. For radiology groups reading at multiple facilities, we manage the professional component (-26) billing while ensuring our claims are coordinated with each facility's technical billing to avoid duplicate claim conflicts. For physician-owned imaging centers where the radiologist group and facility are owned by the same entity, we manage global billing — capturing both components on a single claim at the global rate. For ASC-based procedures, we handle both the professional claim and the ASC facility claim using correct ASC fee schedule codes. The billing structure is determined at onboarding based on each practice's ownership arrangement.
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