CPT 74363Radiology

X-ray bile duct dilation

CPT code 74363 covers an x-ray examination performed during or after a procedure to widen (dilate) a bile duct, typically when the duct is narrowed or blocked. This imaging helps doctors confirm the dilation was successful and the bile duct is open.

Showing rates for

National Average

Base Medicare rate

$38.17

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.88

PE RVU (NF)

0.24

MP RVU

0.06

Total RVU

1.18

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Always verify if 74363 is bundled into the primary therapeutic procedure code (such as 47555 or 43277) before billing separately
Impact: Prevents 100% denial for bundling violations; saves time on appeals and reduces accounts receivable aging
Document the number of images obtained, specific stricture location, pre- and post-dilation measurements, and balloon inflation pressure in the interpretation report
Impact: Strengthens medical necessity defense against audits and reduces denial rate by approximately 25-40%
When performed with ERCP, confirm whether the radiological supervision is separately billable or included in the ERCP code based on approach and documentation
Impact: ERCP codes often include fluoroscopy; billing 74363 without proper justification results in denials; proper coding captures legitimate $38.17 when truly separate
Use modifier 26 consistently in hospital settings where you do not own the equipment to avoid overpayment recoveries
Impact: Prevents compliance issues and overpayment clawbacks that can exceed thousands of dollars in aggregate audits
Link to specific ICD-10 codes indicating biliary stricture, obstruction, or dilation necessity (K83.1, K91.89, C24.0) rather than generic symptoms
Impact: Improves first-pass payment rate by 15-30% and reduces medical necessity denials
Bill on the same date of service as the dilation procedure with appropriate time documentation if multiple sessions occur
Impact: Ensures proper chronological linking and prevents date-of-service mismatches that cause processing delays

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 74363 in 2025?

The 2025 Medicare national average reimbursement for CPT 74363 is $38.17 for both facility and non-facility settings. This rate is based on 1.18 total RVUs multiplied by the 2025 conversion factor of 32.3465.

Can CPT 74363 be billed with ERCP codes?

CPT 74363 may be billed with ERCP codes, but many payers consider fluoroscopic guidance bundled into ERCP procedures. You must document that the bile duct dilation supervision was a distinct service beyond routine ERCP fluoroscopy and may need modifier 59 to indicate a separate service. Verify payer-specific policies before billing.

What is the difference between CPT 74363 and 74300?

CPT 74363 is for radiological supervision during active bile duct dilation (therapeutic), while CPT 74300 is for diagnostic cholangiography imaging of the bile ducts. Code 74363 involves real-time imaging during balloon inflation and therapeutic intervention, whereas 74300 is purely diagnostic visualization.

Do I need modifier 26 when billing CPT 74363 in a hospital?

Yes, you typically need modifier 26 when billing CPT 74363 in a hospital setting if you are billing only for the physician interpretation and the hospital owns the equipment. The hospital bills the technical component separately with modifier TC. Omitting modifier 26 can result in overpayment and subsequent recoupment.

What are the RVU values for CPT code 74363?

CPT 74363 has a work RVU of 0.88, practice expense RVU of 0.24 (both facility and non-facility), and malpractice RVU of 0.06, totaling 1.18 RVUs for 2025.

What diagnosis codes support medical necessity for CPT 74363?

Common supporting diagnosis codes include K83.1 (obstruction of bile duct), K91.89 (postprocedural bile duct complications), C24.0 (malignant neoplasm of extrahepatic bile duct), K80.5 (calculus of bile duct), and K83.0 (cholangitis). The diagnosis must clearly indicate a biliary stricture or obstruction requiring therapeutic dilation.

Is CPT 74363 bundled with percutaneous transhepatic cholangiography?

CPT 74363 may be separately billable when performed with percutaneous transhepatic biliary drainage (47510, 47511) if the dilation is a distinct service beyond initial catheter placement. However, some payers bundle radiological supervision into the primary procedure code. Check NCCI edits and use modifier 59 with clear documentation when billing both codes together.