HCPCS code Q4376: Wound graft, duoGraft AA, per square centimeter2026 Medicare rate & RVUs in California
Report DuoGraft AA by the square centimeter when this specific wound-graft product is supplied with a primary wound application procedure.
Medicare pays $139.47–$183.51 for Q4376 in the office in California, from Bakersfield, CA to Santa Clara County, CA. 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 Q4376 covers
Q4376 represents the DuoGraft AA wound-graft product by the square centimeter, rather than the clinician’s work applying it. It is reported when this specific product is placed on a wound during a graft application, such as treatment of a chronic wound. Wound-care clinicians, surgeons, and podiatrists may use the product in outpatient clinics or hospital outpatient departments. Select the code by the product used, not by the wound diagnosis alone.
Report the square centimeters of DuoGraft AA represented by the units, supported by documentation of the product identity, treated site, and area applied. Q4376 is an add-on code: submit it only with a primary procedure, and CMS pays it within that procedure’s global period. CMS classifies the code as technical-component-only, with interpretation covered by a separate code. Pair it with the applicable skin-substitute application procedure; that procedure is selected according to the wound site and treated area.
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 Q4376 pays more and less in California
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
29 payment localities
$139.47 to $183.51
29 of 29 payment localities
| Payment locality | Office | Facility |
|---|---|---|
| Bakersfield, CA | $139.47 | Unavailable |
| Chico, CA | $139.47 | Unavailable |
| El Centro, CA | $139.47 | Unavailable |
| Fresno, CA | $139.47 | Unavailable |
| Hanford, CA | $139.47 | Unavailable |
| Los Angeles, CA | $150.55 | Unavailable |
| Madera, CA | $139.47 | Unavailable |
| Marin County, CA | $179.43 | Unavailable |
| Merced, CA | $139.47 | Unavailable |
| Modesto, CA | $139.47 | Unavailable |
| Napa, CA | $167.73 | Unavailable |
| Oxnard, CA | $150.42 | Unavailable |
| Redding, CA | $139.47 | Unavailable |
| Rest of California | $139.47 | Unavailable |
| Riverside, CA | $139.47 | Unavailable |
| Sacramento, CA | $148.00 | Unavailable |
| Salinas, CA | $147.49 | Unavailable |
| San Benito County, CA | $183.51 | Unavailable |
| San Diego, CA | $152.20 | Unavailable |
| San Francisco, CA | $179.43 | Unavailable |
| San Luis Obispo, CA | $144.95 | Unavailable |
| Santa Clara County, CA | $183.51 | Unavailable |
| Santa Cruz, CA | $154.62 | Unavailable |
| Santa Maria, CA | $148.38 | Unavailable |
| Santa Rosa, CA | $156.27 | Unavailable |
| Stockton, CA | $139.47 | Unavailable |
| Vallejo, CA | $167.73 | Unavailable |
| Visalia, CA | $139.47 | Unavailable |
| Yuba City, CA | $139.47 | Unavailable |
How the Q4376 rate is calculated
Each of Q4376’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 · Q4376
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 Q4376
The CMS indicators that decide how Q4376 is paid alongside other services.
CMS payment indicators · Q4376
Wound graft, duoGraft AA, per square centimeter
| 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. |
Q4376 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4375Wound graftDuograft AC, per square centimeter
- Q4375 identifies DuoGraft AC, while Q4376 identifies DuoGraft AA. Use the product code that matches the documented graft supplied.
- Q4377Skin substituteTrigraft, per sq cm
- Q4377 identifies Trigraft FT, a different wound-graft product. It is not interchangeable with DuoGraft AA based only on wound site or diagnosis.
- 15271Skin substitute graftFirst 25 cm², trunk/limbs
- CPT 15271 reports the qualifying application procedure for a trunk or limb wound; Q4376 identifies the DuoGraft AA product used with a primary procedure.
Q4376 billing questions
Can Q4376 be submitted without a primary procedure?
No. CMS identifies Q4376 as an add-on code that must be billed with a primary procedure.
What does one unit represent?
The code is reported per square centimeter. Document the amount of DuoGraft AA applied to the wound.
Does Q4376 include the clinician’s application work?
No. Q4376 identifies the DuoGraft AA product; report the applicable primary procedure for the wound application.
How is Q4376 different from Q4375?
Both identify DuoGraft products, but Q4376 is for DuoGraft AA and Q4375 is for DuoGraft AC. Report the code matching the product used.
How does CMS classify the code’s components?
CMS classifies Q4376 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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