HCPCS code Q4379: Wound graft, amnioDefend FT, per sq cm2026 Medicare rate & RVUs in Guam
Report AmnioDefend FT by square centimeter when the product is furnished for wound grafting and billed with a primary application procedure.
Medicare pays $144.69 for Q4379 in the office in Guam (Hawaii, Guam, HI). 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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What Q4379 covers
Q4379 identifies the AmnioDefend FT wound graft product, reported by the square centimeter furnished. Wound-care clinicians and surgeons may use it during a procedure to cover a wound bed; the application service is reported separately under the appropriate primary procedure code. The product code identifies the material, not the clinician’s work in preparing the wound or applying the graft.
Report units based on the documented square centimeters of product furnished, and pair Q4379 with the primary procedure. The record should identify AmnioDefend FT, the wound site, the amount used, and the associated application procedure. CMS classifies Q4379 as an add-on code: it is billed only with a primary procedure and paid within that procedure’s global period. CMS also classifies it as technical-component-only; a separate code covers interpretation.
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.
Q4379 in Hawaii, Guam, HI
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam, HI | $144.69 | Unavailable |
How the Q4379 rate is calculated
Each of Q4379’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 · Q4379
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 Q4379
The CMS indicators that decide how Q4379 is paid alongside other services.
CMS payment indicators · Q4379
Wound graft, amnioDefend FT, 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. |
Q4379 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; Q4379 identifies AmnioDefend FT. Use the code matching the product furnished.
- Q4377Skin substituteTrigraft, per sq cm
- Q4377 identifies Trigraft FT rather than AmnioDefend FT. The product name, not the shared per-square-centimeter unit, distinguishes the codes.
- Q4385Wound productApollo FT, per square centimeter
- Q4385 identifies Apollo FT. Report Q4379 only when AmnioDefend FT was furnished.
Q4379 billing questions
Can Q4379 be billed by itself?
No. CMS identifies Q4379 as an add-on code that must be billed with a primary procedure.
How should the units be determined?
Report the square centimeters of AmnioDefend FT furnished, supported by the product amount and wound documentation.
Which procedure is billed with Q4379?
Pair it with the primary wound-graft application procedure appropriate to the wound site and treated area, such as CPT 15271 when applicable.
Does Q4379 include interpretation?
No. CMS classifies Q4379 as technical-component-only and identifies a separate code for interpretation.
What documentation supports Q4379?
Document the product as AmnioDefend FT, the wound site, the square centimeters furnished, and the primary application procedure.
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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