HCPCS code Q4179: Wound product2026 Medicare rate & RVUs in Guam
Report Q4179 for each square centimeter of Flowerderm used as a wound covering with a qualifying primary wound procedure.
Medicare pays $144.69 for Q4179 in the office in Guam (Hawaii, Guam). 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.
On this page 9 sections
What Q4179 covers
Q4179 identifies Flowerderm, a wound-care product reported by the square centimeter. It is used when a clinician applies the product to a wound as part of wound treatment. Wound-care clinicians and surgeons may use it in outpatient wound clinics, physician offices, or hospital settings. The code identifies the product quantity, not the clinical work of assessing or treating the wound.
Report units according to the square centimeters of Flowerderm used, and document the product and treated area. CMS identifies Q4179 as an add-on code: bill it only with a primary procedure, and payment falls within that procedure’s global period. CMS also classifies it as technical-component-only, with interpretation covered by a separate code. Pair it with the appropriate primary wound procedure for the service performed; the product code does not replace that procedure.
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.
Q4179 in Hawaii, Guam
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam | $144.69 | Unavailable |
How the Q4179 rate is calculated
Each of Q4179’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 · Q4179
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 Q4179
The CMS indicators that decide how Q4179 is paid alongside other services.
CMS payment indicators · Q4179
Wound product
| 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. |
Q4179 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4178Wound product
- Q4178 identifies Floweramniopatch, while Q4179 identifies Flowerderm. Match the claim to the product actually applied.
- Q4177Floweramnioflo, 0.1 cc
- Q4177 identifies Floweramnioflo and uses a volume-based unit; Q4179 identifies Flowerderm and is reported per square centimeter.
- Q4186EpiFix material
- Q4186 identifies EpiFix, a different wound-care product. Both codes use area-based units, so product identity distinguishes them.
Q4179 billing questions
How is Q4179 different from Q4178?
Q4179 is for Flowerderm; Q4178 is for Floweramniopatch. Select the code that matches the product used, not just the wound site or product area.
What should support the reported units?
Document the Flowerderm product used and the square centimeters applied. Report the quantity in square-centimeter units.
Can Q4179 be billed by itself?
No. CMS identifies it as an add-on code that must be billed with a primary procedure.
Is interpretation included in Q4179?
CMS classifies Q4179 as technical-component-only and indicates that a separate code covers interpretation.
Does Q4179 have a separate global period?
No separate period is identified here. Payment for Q4179 is within the primary procedure’s global period.
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
Show the CMS file lines behind this rate
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