94729 Diffusing capacity
Also known as: DLCO test, carbon monoxide diffusing capacity, gas transfer test
Diffusing capacity testing to measure carbon monoxide transfer across alveolar-capillary membrane to assess gas exchange ability.
In Plain Language
lung gas exchange test; oxygen transfer ability test
Clinical Context
Used to detect alveolar-capillary disease including interstitial lung disease, emphysema, anemia, and pulmonary hypertension.
RVU Breakdown
| Work RVU | 0.19 |
| Total RVU | 0.19 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Medicine section codes cover a wide range of non-surgical services. Documentation should include the clinical indication, procedure details, interpretation (if applicable), and any patient-specific findings.
How This Code Compares
With a work RVU of 0.19, this code ranks in the 11th percentile among Medicine codes — 4.1x below the median (0.78). The highest wRVU in this category is 23.92.
Specialties
Frequently Asked Questions
What is CPT code 94729?
CPT 94729 (Diffusing capacity) is a Medicine code. Diffusing capacity testing to measure carbon monoxide transfer across alveolar-capillary membrane to assess gas exchange ability.
Who uses CPT code 94729?
CPT 94729 is used by Pulmonology, Internal Medicine, Occupational Medicine. Used to detect alveolar-capillary disease including interstitial lung disease, emphysema, anemia, and pulmonary hypertension.
When is CPT 94729 used?
Used to detect alveolar-capillary disease including interstitial lung disease, emphysema, anemia, and pulmonary hypertension.
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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.