Direct Answer
Radiology billing is structured around the technical component (TC) and professional component (PC) split. The technical component covers the equipment, staff, and facility costs of performing the imaging study. The professional component covers the radiologist's interpretation and report. When a radiologist works in a hospital or independent imaging center (where they do not own the equipment), they bill only the professional component using Modifier 26. When a radiologist owns a freestanding imaging center, they bill the global code (both TC and PC together). Interventional radiology adds a procedural dimension where the radiologist performs image-guided procedures that generate both an imaging and a surgical-equivalent service.
Table of Contents
Technical Component and Professional Component Billing
The TC/PC split is the foundational billing concept in radiology: Technical component (Modifier TC): covers: the equipment (MRI machine, CT scanner, X-ray unit); the facility and room; the technologist's time to perform the study; the supplies (contrast, film, digital storage); billed by: the entity that owns the equipment — typically the hospital, outpatient imaging center, or freestanding radiology group's equipment subsidiary; Professional component (Modifier 26): covers: the radiologist's interpretation of the images; the written report documenting the findings; billed by: the radiologist or radiology group that performs the interpretation; Global billing (no modifier): when the same entity owns the equipment AND employs or contracts the interpreting radiologist, the global code (no modifier) can be billed; common in: freestanding radiology practices that own their equipment; physician office imaging (cardiologist with their own echocardiography equipment interpreting the echo); PC-only radiology groups: hospital-based radiology groups typically bill only Modifier 26 — the hospital bills the TC through the outpatient facility billing system (APC-based); independent radiology groups interpreting hospital studies: Modifier 26 only; Calculating TC and PC payments: Medicare assigns separate RVUs for the TC and PC of each radiology code; the TC RVU is typically 40-60% of the global; the PC RVU is 40-60%; the split varies by modality — MRI has a higher TC proportion due to equipment cost; X-ray has a higher PC proportion relative to TC cost; Radiology report requirements: the written report is the deliverable that justifies the professional component; the report must include: date of study; clinical indication; technique (modality, field strength for MRI, with/without contrast, etc.); findings; impression; radiologist's signature; a report that is dictated but not signed (transcribed/finalized) creates a professional component billing risk.
Diagnostic Imaging CPT Code Families
Each imaging modality has its own CPT code family with specific code selection rules: X-ray: chest X-ray: 71045 (1 view), 71046 (2 views), 71047 (3 views), 71048 (4+ views); extremity X-ray: 73000 series (upper extremity) and 73500 series (lower extremity); CT: CT head without contrast: 70450; with contrast: 70460; without and with contrast: 70470; CT chest without contrast: 71250; with contrast: 71260; PE protocol CTA: 71275; CT abdomen and pelvis: separate codes for abdomen (74150-74178) and pelvis (72192-72194); CT angiography: 70496 (head), 70498 (neck), 71275 (chest), 74175 (abdomen), 73706 (lower extremity); MRI: MRI brain without contrast: 70551; with: 70552; without and with: 70553; MRI spine: cervical 72141-72142-72156; thoracic 72146-72147-72157; lumbar 72148-72149-72158; fMRI: 70555; MR angiography: 70544 (head), 70545 (neck), 71555 (chest), 74185 (abdomen); Ultrasound: abdominal ultrasound: 76700 (complete), 76705 (limited/focused); renal ultrasound: 76770-76775; pelvic ultrasound: 76856 (complete), 76857 (limited); OB ultrasound: 76801-76817 (by gestational age and completeness); duplex ultrasound — see vascular section; Contrast administration: when contrast is used: the code must specify "with contrast"; separately billing contrast administration (A9576 for MRI contrast agent, e.g., gadolinium) is a facility/technical billing item — not a professional component item; Fluoroscopy: 77002-77003 (guidance for needle placement); these are add-on codes to the primary procedure.
Interventional Radiology Billing
Interventional radiology (IR) combines the imaging technical knowledge of radiology with procedural skills: IR billing structure: IR procedures have two separately billable components: the procedural code (the intervention itself) and the imaging supervision and interpretation (S&I) code; some IR procedures bundle the S&I into the primary procedural code; others require separate S&I codes; Vascular access: central venous catheter placement: 36555 (non-tunneled, under 5 years); 36556 (non-tunneled, 5 years and older); 36557 (tunneled, no cuff); 36558 (tunneled, with cuff); 36561 (implanted port); imaging guidance (fluoroscopy or ultrasound): 77001 (fluoroscopy for central vascular access) — add-on code; 76937 (ultrasound guidance for vascular access); Drainage procedures: abscess drainage: 10030 (abscess drainage using ultrasound guidance); 49405-49407 (visceral/retroperitoneal drainage under imaging guidance — image guidance included); 49423 (exchange of percutaneous drainage catheter under radiological guidance); biliary drainage: 47490 (cholecystostomy, percutaneous); 47510-47511 (percutaneous transhepatic biliary drainage); nephrostomy tube: 50432 (percutaneous placement); 50433 (with conversion to nephroureteral catheter); vertebroplasty and kyphoplasty: 22510-22515 (vertebroplasty); 22513-22515 (kyphoplasty); imaging guidance included in these codes; Catheter angiography (diagnostic): 36221-36228 — catheter-based cerebrovascular angiography; these codes include both the catheterization and the angiographic imaging supervision and interpretation; aortic angiography: 75600 (thoracic), 75625 (abdominal); selective catheterization is coded in addition to the aortogram.
Nuclear Medicine and PET Billing
Nuclear medicine and PET imaging have distinct code families and radiopharmaceutical billing: Nuclear medicine codes: 78000-78999 — nuclear medicine diagnostic codes; bone scan: 78300 (limited), 78306 (whole body), 78315 (3-phase); thyroid scan: 78013 (with uptake); cardiac perfusion: 78451-78454 (SPECT); liver/spleen scan: 78216; pulmonary ventilation/perfusion (V/Q scan): 78580 (perfusion), 78582 (ventilation and perfusion); PET imaging: 78816 — PET scan, whole body; 78815 — skull base to mid-thigh; 78814 — limited area; 78813 — whole body (with CT attenuation correction); FDG PET codes: the above codes are used for FDG PET; Radiopharmaceutical billing: the radiotracer is billed separately from the imaging service; Tc-99m (technetium): A9500-A9599 series HCPCS codes; FDG (F-18 fluorodeoxyglucose) for PET: A9552; specific HCPCS codes for each radiopharmaceutical exist; radiopharmaceutical cost is recovered through the HCPCS supply code on the facility/technical claim; PET medical necessity for Medicare: FDG PET is covered for specific indications under NCD 220.6; covered indications include: initial diagnosis of cancer (specific cancers); staging (lung, esophageal, colorectal, lymphoma, melanoma, head and neck); restaging after treatment; brain: Alzheimer's differential diagnosis (NCD 220.6.20); cardiac viability assessment; PET for initial staging of prostate cancer (PSMA PET): covered under NCD 220.6.19 for specific indications; documentation must clearly support the covered indication.
Radiology Denials and RCM
Radiology billing denials cluster around prior authorization, TC/PC billing errors, and NCD/LCD compliance: Common radiology denial patterns: MRI and CT prior authorization: most commercial payers require PA for advanced imaging (MRI, CT, PET); radiology benefit managers (RBMs) such as Carelon (formerly AIM Specialty Health), National Imaging Associates (NIA), and eviCore Healthcare manage PA for imaging on behalf of payers; the ordering physician is responsible for obtaining PA — but the radiology group needs to verify PA was obtained before performing the study; TC/PC mismatch: the radiologist bills Modifier 26 but the hospital also bills the global (without TC modifier) — resulting in overlapping claims; each entity must bill only their component; report not finalized: billing the professional component for a study where the report has been dictated but not signed by the interpreting physician; the professional component is earned when the interpretation is complete and documented; concurrent review (RBM) for advanced imaging: some payers require concurrent review (real-time approval) rather than prospective PA; the ordering physician must engage the RBM before the study; Radiology RCM best practices: PA verification before imaging: implement a check-in workflow that verifies PA authorization number before every scheduled MRI and CT; the authorization number must be on the claim; RBM portal integration: most large radiology groups integrate RBM portal access into the scheduling workflow so that PA status can be checked and initiated at the time of scheduling; report turnaround time management: professional component claims should be held until the report is finalized and signed; tracking finalization status daily and releasing claims promptly after signing minimizes days in AR.
FAQ
When should a radiology group bill Modifier 26 vs. the global code vs. Modifier TC?
The correct modifier selection depends on who owns the imaging equipment and who performs the interpretation: Scenario 1 — Radiologist employed or contracted by a hospital interprets studies on hospital equipment: the hospital bills the technical component (Modifier TC on the radiology code, or through the facility billing system as an APC); the radiology group bills the professional component (Modifier 26); neither entity should bill the global code; Scenario 2 — Radiology group owns a freestanding imaging center and employs its own technologists: the radiology group owns both the equipment (TC) and provides the interpretation (PC); the radiology group bills the global code (no modifier); if the center and the professional billing are separate legal entities, each bills their component separately; Scenario 3 — Cardiologist performs and interprets an echocardiogram in their own office using their own equipment: the cardiologist bills globally (no modifier) for the echo they perform and interpret; this applies to any physician who owns the imaging equipment and personally interprets the study; Scenario 4 — Radiologist reads a CT performed at an outside imaging center (teleradiology): the outside imaging center bills TC; the teleradiology radiologist (or their group) bills Modifier 26; Scenario 5 — Urgent care clinic performs and interprets an X-ray using their own equipment and in-house physician: the urgent care clinic can bill globally — physician performs the study and reads it; however, if a radiologist reads the X-ray later (over-read): the urgent care physician's global claim and the radiologist's Modifier 26 may both be submitted; payers typically pay the interpreting radiologist's Modifier 26 and deny the global claim's PC component, or pay both at reduced rates — payer policy varies; this over-read scenario requires clear communication between the billing parties about who is billing what.
How does the radiology benefit manager (RBM) prior authorization process work and what happens when a study is performed without authorization?
Radiology benefit managers (RBMs) are third-party organizations that commercial payers contract with to manage prior authorization and utilization of advanced imaging services. Understanding their role is essential for radiology and ordering physician billing staff: How RBM prior authorization works: the ordering physician (or their staff) submits a PA request to the RBM through a web portal, phone, or fax; the request includes: the CPT code for the requested imaging; the ICD-10 diagnosis code(s) supporting medical necessity; clinical documentation supporting the indication; the RBM reviews the request against evidence-based appropriateness criteria (often derived from ACR Appropriateness Criteria or similar guidelines); approval generates an authorization number that must be included on the claim; When the RBM denies a PA: the ordering physician can request a peer-to-peer review with the RBM's medical reviewer; peer-to-peer: a clinician-to-clinician conversation where the ordering physician presents the clinical case for why the imaging is appropriate; peer-to-peer reversal rates are significant — many initial PA denials are overturned at peer-to-peer; if the peer-to-peer is denied, an appeal can be filed through the payer's standard appeals process; What happens when imaging is performed without PA: if the study is performed without a required PA: the claim will be denied for "missing authorization"; the radiology group cannot balance-bill the patient for a denial that resulted from the ordering physician's failure to obtain PA; the patient cannot be charged for the denied service in most commercial plan contracts; the radiology group's only recourse is to appeal based on retrospective medical necessity — some payers allow retro-authorization for certain circumstances (emergency imaging, clinical urgency); the financial loss falls on the radiology group or the facility that performed the study; Radiology group's role: while the PA responsibility lies with the ordering physician, the radiology group has a financial interest in verifying PA was obtained before performing the study; a verification workflow at check-in that confirms authorization number, matching CPT code, and matching date of service prevents most missing authorization denials on the radiology group's claim.
Radiology Revenue Cycle Management That Maximizes Professional Component Capture
Valiant Lifecare's radiology billing specialists manage TC/PC modifier accuracy, advanced imaging prior authorization verification, RBM portal integration, interventional radiology procedural and S&I code selection, nuclear medicine and PET NCD documentation, and the full spectrum of radiology denial prevention — ensuring your radiology group captures full reimbursement for every interpretation and intervention.
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