HCPCS code Q4377: Skin substitute, trigraft, per sq cm2026 Medicare rate & RVUs in Texas
Report Q4377 for Trigraft supplied for wound coverage, measured in square centimeters and billed with the applicable primary application procedure.
Medicare pays $115.80–$134.64 for Q4377 in the office in Texas, from Beaumont, TX to Austin, TX. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
What Q4377 covers
Q4377 identifies the Trigraft product supplied for wound coverage, with reporting based on square centimeters. A wound-care clinician, surgeon, or other treating practitioner may use the product during a wound-care encounter after preparing the wound bed. The HCPCS code identifies the product, not the clinical work of preparing the site or applying the material.
Report the quantity supported by the product used, and document the product identity, wound site, area treated, and associated application procedure. Q4377 is an add-on code: submit it only with a primary procedure, and its payment falls within that procedure’s global period. CMS classifies it as technical-component-only; a separate code covers interpretation. The applicable primary procedure depends on the wound location and treated area, so the product code does not replace the application service.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where Q4377 pays more and less in Texas
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
8 payment localities
$115.80 to $134.64
8 of 8 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Austin, TX | $134.64 | Unavailable |
| Beaumont, TX | $115.80 | Unavailable |
| Brazoria, TX | $126.11 | Unavailable |
| Dallas, TX | $126.75 | Unavailable |
| Fort Worth, TX | $125.48 | Unavailable |
| Galveston, TX | $126.37 | Unavailable |
| Houston, TX | $126.37 | Unavailable |
| Rest of Texas | $120.77 | Unavailable |
How the Q4377 rate is calculated
Each of Q4377’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · Q4377
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense3.81
3.81 RVUs× 1.000 GPCI
Malpractice0.00
0.00 RVUs× 1.000 GPCI
Adjusted RVUs
3.8100
Conversion factor
$33.4009
Medicare rate
$127.26
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for Q4377
The CMS indicators that decide how Q4377 is paid alongside other services.
CMS payment indicators · Q4377
Skin substitute, trigraft, per sq cm
| Rule | CMS value | What it means |
|---|---|---|
| Global period | ZZZ | Add-on code: falls within the primary procedure’s global period. |
| Multiple procedures | 0 | No multiple-procedure reduction. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 3 | Technical component only. |
Q4377 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4378Wound matrixRenew FT, per square centimeter
- Q4378 identifies Renew FT Matrix, while Q4377 identifies Trigraft. Select the code for the product supplied; both descriptors use square-centimeter units.
- Q4379Wound graftAmnioDefend FT, per sq cm
- Q4379 identifies Amniodefend FT rather than Trigraft. The product identity, not the wound’s size alone, distinguishes these codes.
- 15271Skin substitute graftFirst 25 cm², trunk/limbs
- 15271 reports the primary application service for specified wound locations and area; Q4377 identifies the Trigraft product used with a primary procedure.
Q4377 billing questions
How is Q4377 different from another skin-substitute product code?
Q4377 identifies Trigraft specifically. Use the code matching the product actually supplied rather than choosing among product codes based only on wound size or location.
Is Q4377 reported by wound or by square centimeter?
The descriptor is per square centimeter. Document the product quantity used in square centimeters and the area treated.
Can Q4377 be billed by itself?
No. CMS identifies it as an add-on code that must be billed with a primary procedure.
Does Q4377 include the wound application service?
No. Q4377 identifies the Trigraft product. Report the applicable primary application procedure for the clinical service.
How does the global-period rule affect Q4377?
Payment for Q4377 falls within the primary procedure’s global period. Submit it with that primary procedure rather than as a standalone service.
What does the technical-component designation mean here?
CMS classifies Q4377 as technical-component-only, with interpretation covered by a separate code.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
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