78598 Lung perf & ventilat diferentl
Also known as: differential V/Q study
Lung perfusion and ventilation imaging with differential measurement performed to assess asymmetric lung function.
In Plain Language
separate lung breathing and blood flow
Clinical Context
Quantifies relative ventilation and perfusion contribution of each lung in chronic lung disease and post-surgical assessment.
RVU Breakdown
| Work RVU | 0.83 |
| Total RVU | 0.83 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Radiology codes require a written order, clinical indication, and a formal interpretation report. The professional component (modifier -26) and technical component (modifier -TC) may be billed separately.
How This Code Compares
With a work RVU of 0.83, this code ranks in the 52nd percentile among Radiology codes — 1.0x the median (0.81). The highest wRVU in this category is 11.57.
Specialties
Frequently Asked Questions
What is CPT code 78598?
CPT 78598 (Lung perf & ventilat diferentl) is a Radiology code. Lung perfusion and ventilation imaging with differential measurement performed to assess asymmetric lung function.
Who uses CPT code 78598?
CPT 78598 is used by Nuclear Medicine, Pulmonology, Radiology. Quantifies relative ventilation and perfusion contribution of each lung in chronic lung disease and post-surgical assessment.
When is CPT 78598 used?
Quantifies relative ventilation and perfusion contribution of each lung in chronic lung disease and post-surgical assessment.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.