CPT 94729
Global ZZZ ActiveDiffusing capacity
CPT 94729 Billing & Documentation Guide
CPT code 94729 (Diffusing capacity) is classified under Pulmonary with a global period indicator of ZZZ. The 2026 Medicare Physician Fee Schedule assigns a work RVU of 0.19, a non-facility practice expense RVU of 1.69, and a malpractice RVU of 0.02, a total non-facility RVU of 1.9 and facility RVU of 1.9. With the current conversion factor of $33.4009, the national average non-facility reimbursement is approximately $65.96, though rates vary from $55.18 to $88.8 based on MAC locality and Geographic Practice Cost Indices (GPCIs).
When billing 94729, ensure documentation supports medical necessity and the specific components required for the code's level of service. For E/M codes, document MDM (medical decision-making) elements: problems addressed, data reviewed, and risk. For procedural codes, document the indication, technique, and any complications. Always verify NCCI edits before bundling 94729 with related codes; this code has 10 PTP bundling relationships on file (see table below).
Payment Status & Global Period
Active code (paid under MPFS)
Add-on code (global concept does not apply)
MUE Limit (Medically Unlikely Edits)
Submitting more than 1 units of 94729 for the same patient on the same date triggers automatic line denial unless an appropriate modifier and supporting documentation justify the higher quantity.
RVU Breakdown, CPT 94729
| Component | Non-Facility | Facility |
|---|---|---|
| Work RVU | 0.19 | 0.19 |
| Practice Expense RVU | 1.69 | 1.69 |
| Malpractice RVU | 0.02 | 0.02 |
| Total RVU | 1.9 | 1.9 |
| Conversion Factor | $33.4009 | |
2026 Medicare Reimbursement by State, CPT 94729
State-level averages across all MAC localities. Non-facility rates typically apply to office-based services; facility rates apply to hospital outpatient / inpatient.
| State | Non-Facility | Facility | Range (Non-Fac) | Localities |
|---|---|---|---|---|
| California | $73.73 | $73.73 | $68.68 - $88.8 | 29 |
| Florida | $64.28 | $64.28 | $61.31 - $66.8 | 3 |
| Georgia | $61 | $61 | $57.49 - $64.52 | 2 |
| Illinois | $62.19 | $62.19 | $58.93 - $65.55 | 4 |
| Michigan | $60.29 | $60.29 | $58.64 - $61.94 | 2 |
| North Carolina | $59.44 | $59.44 | $59.44 - $59.44 | 1 |
| New York | $70.53 | $70.53 | $60.44 - $75.11 | 5 |
| Ohio | $58.56 | $58.56 | $58.56 - $58.56 | 1 |
| Pennsylvania | $62.41 | $62.41 | $58.8 - $66.02 | 2 |
| Texas | $62.57 | $62.57 | $58.33 - $66.67 | 8 |
Source: CMS PFSRVU 2026 · Updated 2026-04-01. Full locality-level detail available for all 53 states, contact us for custom reports.
NCCI Bundling Edits, CPT 94729
Procedure-to-procedure (PTP) edits. If you bill any of these codes with 94729 on the same date of service, review the modifier indicator and payer policy before submission.
| Partner Code | Relationship | Modifier Allowed | Rationale |
|---|---|---|---|
| 00520 | Column 1 (primary), can be billed with modifier | No | Anesthesia service included in surgical procedure |
| 36591 | Column 1 (primary), can be billed with modifier | No | CPT Manual or CMS manual coding instruction |
| 36592 | Column 1 (primary), can be billed with modifier | No | CPT Manual or CMS manual coding instruction |
| 96523 | Column 1 (primary), can be billed with modifier | No | CPT Manual or CMS manual coding instruction |
| 99201 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 99201 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 99202 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 99202 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 99203 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
| 99203 | Column 1 (primary), can be billed with modifier | Yes | CPT Manual or CMS manual coding instruction |
Frequently Asked Questions, CPT 94729
What does CPT code 94729 mean? +
CPT code 94729 represents: Diffusing capacity. It's in the Pulmonary category with a global period of ZZZ.
What is the Medicare reimbursement for CPT 94729? +
The 2026 Medicare national average non-facility payment for CPT 94729 is $65.96. Rates range from $55.18 to $88.8 across 53 states depending on MAC locality and GPCIs.
What modifiers can I use with CPT 94729? +
Medicine section spans a wide range: therapy services use GP/GO/GN (PT/OT/SLP plans of care) and KX (above cap with documentation). Drug administration uses JW (waste) and JZ (no waste). Professional/technical split applies to some diagnostic codes.
What bundling edits apply to CPT 94729? +
This code has 10 NCCI PTP bundling relationships. See the NCCI Bundling section below for full list.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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