CPT 78730Radiology

Urinary bladder retention

CPT code 78730 is used for a nuclear medicine test that measures how much urine remains in your bladder after you urinate, helping doctors diagnose urinary retention problems.

Showing rates for

National Average

Base Medicare rate

$64.05

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

0.15

PE RVU (NF)

1.82

MP RVU

0.01

Total RVU

1.98

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

NCCI bundling edits

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Billing tips

Always document both pre-void and post-void bladder images with calculated residual volume in the radiologist's report
Impact: Prevents denials for incomplete procedure; ensures full $64.05 reimbursement rather than reduced payment with modifier 52
Verify authorization requirements before the procedure as many payers require prior authorization for nuclear medicine studies
Impact: Prevents denial of entire $64.05 claim; authorization denials can result in 100% payment loss
Bill global code without modifiers when performing complete study in non-facility setting to maximize reimbursement
Impact: Ensures receipt of full $64.05 global payment rather than split professional/technical components
Document the specific radiopharmaceutical used, dosage, and route of administration in the medical record
Impact: Supports medical necessity during audits; prevents recoupment of $64.05 payment in post-payment reviews
Do not bill separately for catheterization if performed solely to instill radiopharmaceutical for this study
Impact: Avoids unbundling denials; separate catheterization billing could trigger audit and denial of both codes
Ensure diagnosis codes support medical necessity such as urinary retention (R33.9), neurogenic bladder (N31.9), or enlarged prostate (N40.0)
Impact: Lack of appropriate diagnosis may result in medical necessity denial and loss of $64.05 payment

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 78730 in 2025?

The 2025 Medicare national average reimbursement for CPT 78730 is $64.05 for both facility and non-facility settings. This rate is based on 1.98 total RVUs multiplied by the 2025 conversion factor of 32.3465.

How many RVUs is CPT code 78730 worth?

CPT 78730 has 1.98 total RVUs, consisting of 0.15 work RVU, 1.82 practice expense RVU (both facility and non-facility), and 0.01 malpractice RVU according to the 2025 Medicare Physician Fee Schedule.

Can CPT 78730 be billed with an ultrasound bladder scan on the same day?

Generally, billing both a nuclear medicine bladder study (78730) and ultrasound bladder scan (51798) on the same day may face bundling edits or medical necessity challenges. Use modifier 59 if both are medically necessary and distinct, with documentation explaining why both modalities were required for patient care.

What diagnosis codes support medical necessity for CPT 78730?

Common supporting diagnoses include urinary retention (R33.8, R33.9), neurogenic bladder (N31.9), enlarged prostate with obstruction (N40.1), post-operative urinary retention (R33.0), and overflow incontinence (N39.490). Documentation should link symptoms to the ordered study.

Is prior authorization required for CPT 78730?

Prior authorization requirements vary by payer. Many commercial insurers and Medicare Advantage plans require prior authorization for nuclear medicine procedures including 78730. Always verify authorization requirements with the specific payer before performing the study to avoid denial.

What is the difference between CPT 78730 and 51798?

CPT 78730 is a nuclear medicine bladder retention study using radioactive tracers, while 51798 is an ultrasound measurement of post-void residual urine. Code 78730 reimburses at $64.05 while 51798 typically reimburses less. Nuclear medicine provides additional functional information but ultrasound is usually the first-line diagnostic approach.

Can CPT 78730 be billed separately for professional and technical components?

Yes, CPT 78730 can be split into professional component (modifier 26 for physician interpretation) and technical component (modifier TC for equipment and technologist services). However, the combined payment of both components equals the global $64.05 rate. Bill globally without modifiers when the same entity provides both components.