CPT 78579Radiology

Lung ventilation imaging

CPT code 78579 covers lung ventilation imaging, a nuclear medicine test that uses inhaled radioactive gas or aerosol to create images showing how air moves through the lungs. This diagnostic test helps doctors detect blood clots, chronic lung disease, and airflow problems.

Showing rates for

National Average

Base Medicare rate

$163.67

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

0.49

PE RVU (NF)

4.52

MP RVU

0.05

Total RVU

5.06

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

NCCI bundling edits

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Billing tips

Always verify radiopharmaceutical type and dose are documented in the procedure report, as missing documentation is the leading cause of denials
Impact: Prevents up to 30% of initial denials and eliminates resubmission delays averaging 45-60 days
Bill 78579 separately from perfusion scan (78580-78598) when both are performed; use modifier 59 on the lower-paying code to prevent bundling
Impact: Ensures full reimbursement for both studies totaling approximately $320+ versus bundled payment of $163.67
Document all three phases (wash-in, equilibrium, wash-out) when performed, as incomplete phase documentation may justify only reduced payment with modifier 52
Impact: Protects full $163.67 reimbursement versus 50% reduction ($81.84) for incomplete study
Verify pre-authorization requirements for non-Medicare payers within 48-72 hours of scheduling, as many commercial plans require prior authorization for nuclear medicine studies
Impact: Prevents 100% payment denial and eliminates average $163.67 write-off per unauthorized study
When billing split components (26/TC), ensure both claims include identical diagnosis codes and procedure dates to facilitate payer matching
Impact: Reduces claim processing delays by 40% and prevents partial payment issues
For hospital outpatient settings, verify technical component is billed on UB-04 with appropriate revenue code (0346 for nuclear medicine) to align with professional claim
Impact: Ensures proper payment coordination and prevents duplicate claim denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 78579 in 2025?

The 2025 Medicare national average reimbursement for CPT 78579 is $163.67 for both facility and non-facility settings. This rate is based on 5.06 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary based on geographic locality adjustments.

Can CPT 78579 be billed with a lung perfusion scan on the same day?

Yes, CPT 78579 (ventilation) can be billed with perfusion scans (78580-78598) on the same day as they represent distinct diagnostic procedures commonly performed together for pulmonary embolism evaluation. Use modifier 59 on the lower-paying code to prevent inappropriate bundling and ensure separate payment for both services.

What radiopharmaceuticals are used for CPT 78579 lung ventilation imaging?

Common radiopharmaceuticals for 78579 include Xenon-133 gas (most traditional), Tc-99m DTPA aerosol, and Tc-99m Technegas. The specific agent used must be documented in the procedure report along with the dose administered. The choice of radiopharmaceutical does not change the CPT code or reimbursement.

How many RVUs is CPT code 78579 worth in 2025?

CPT 78579 has a total of 5.06 RVUs in 2025, consisting of 0.49 work RVUs, 4.52 practice expense RVUs, and 0.05 malpractice RVUs. The practice expense RVU is the same (4.52) for both facility and non-facility settings, which is why the reimbursement rate is identical at $163.67.

What diagnosis codes support medical necessity for CPT 78579?

Common ICD-10 codes supporting 78579 include I26.x (pulmonary embolism), R06.0x (dyspnea), J44.x (COPD), R91.8 (abnormal chest imaging findings), and J43.x (emphysema). The diagnosis must justify the need for ventilation imaging specifically, with documentation explaining why alternative testing is insufficient.

Do I need prior authorization for CPT 78579 ventilation imaging?

Medicare typically does not require prior authorization for 78579, but many commercial payers and Medicare Advantage plans do require pre-authorization for nuclear medicine studies. Always verify authorization requirements 48-72 hours before scheduling to prevent denials. Some payers require radiology benefits management (RBM) approval.

What is the difference between CPT 78579 and 78580?

CPT 78579 is for lung ventilation imaging only (evaluating airflow), while 78580 is for lung perfusion imaging only (evaluating blood flow). They are often performed together as a V/Q scan to diagnose pulmonary embolism. Each code is billed separately when both studies are performed, with appropriate modifiers to prevent bundling.