CPT 78709Radiology

K flow/funct image multiple

CPT code 78709 covers kidney imaging tests that use a small amount of radioactive material to evaluate both blood flow to the kidneys and how well they're functioning. This is commonly ordered when doctors need to assess kidney health, transplant viability, or diagnose kidney problems.

Showing rates for

National Average

Base Medicare rate

$321.52

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

1.41

PE RVU (NF)

8.43

MP RVU

0.1

Total RVU

9.94

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

NCCI bundling edits

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Billing tips

Document both flow and function components explicitly in the report to justify 78709 versus lower-paying codes 78701 ($197.88) or 78707 ($247.95)
Impact: Prevents downcoding that could reduce reimbursement by $73.57 to $123.64 per study
Bill radiopharmaceutical separately using HCPCS code A9562 (Tc-99m MAG3) or A9539 (Tc-99m pertechnetate) as these are not included in the CPT technical component
Impact: Recovers $75-150 in additional reimbursement per study depending on dose and payer
Do not unbundle 78709 with same-session bladder residual studies (78730); if both are medically necessary, append modifier 59 with comprehensive documentation
Impact: Prevents automatic denial of bundled codes; ensures payment for both studies when appropriate ($100+ additional revenue)
When Lasix renography is performed, ensure documentation specifies timing of furosemide administration and delayed imaging protocol
Impact: Supports medical necessity and prevents denials for extended imaging time; no separate CPT code for Lasix protocol
For captopril renography, document baseline study and post-ACE inhibitor study separately if two complete acquisitions are performed
Impact: May justify billing 78709 twice with modifier 76 or 59, potentially doubling reimbursement to $643.04 when properly documented
Verify that split renal function calculations (differential percentages) and time-activity curves are included in interpretation report
Impact: Essential documentation to meet CPT descriptor requirements and withstand audits; absence may trigger recoupment demands

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 78709 in 2025?

The 2025 Medicare national average reimbursement for CPT 78709 is $321.52 for both facility and non-facility settings. This rate is based on 9.94 total RVUs multiplied by the 2025 conversion factor of 32.3465. Local rates may vary based on geographic practice cost indices (GPCI).

What is the difference between CPT codes 78701, 78707, and 78709?

CPT 78701 ($197.88) covers kidney imaging for function only without vascular flow assessment. CPT 78707 ($247.95) includes limited vascular flow with function but uses a single imaging agent. CPT 78709 ($321.52) is the most comprehensive, requiring multiple images documenting both detailed vascular flow and complete functional assessment, justifying the higher reimbursement.

Can CPT 78709 be billed bilaterally or with RT/LT modifiers?

No, CPT 78709 is inherently a bilateral procedure that includes evaluation of both kidneys in a single study. The code should be reported once per session regardless of whether one or both kidneys are present. RT/LT modifiers are not appropriate and may trigger claim edits or audits.

Is the radiopharmaceutical included in CPT 78709 reimbursement?

No, radiopharmaceuticals are billed separately using HCPCS codes. Common agents include A9562 for Tc-99m MAG3 or A9539 for Tc-99m pertechnetate. The CPT 78709 payment covers the technical imaging service and professional interpretation, but not the radioactive tracer itself.

How often can CPT 78709 be billed for the same patient?

There is no specific frequency limitation in CPT guidelines, but Medicare and commercial payers typically require medical necessity documentation for repeat studies within 30-90 days. Common valid reasons include transplant monitoring, post-intervention assessment, acute clinical changes, or different clinical indications. Use modifier 76 for same-day repeats.

What documentation is required to bill CPT 78709 versus 78701?

To support CPT 78709, documentation must include both flow phase images (showing arterial perfusion/bolus transit) and functional phase images. The report must explicitly describe vascular flow findings and include time-activity curves with differential function calculations. If only functional images without flow assessment are documented, only 78701 can be billed.

Can CPT 78709 be billed with a kidney ultrasound on the same day?

Yes, CPT 78709 can be billed with ultrasound (76770, 76775) on the same day if both studies are medically necessary and provide complementary information. Nuclear medicine provides functional data while ultrasound provides anatomic detail. No modifier is typically required as these are not bundled codes, but documentation should justify the need for both modalities.