HCPCS Q4356: Wound matrixMedicare rate & RVUs in Texas
Report Q4356 for the square-centimeter quantity of AbioMem or AbioHydro material furnished with a primary wound procedure.
Medicare pays $115.80–$134.64 for Q4356 in the office in Texas, from Beaumont to Austin. 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 Q4356 covers
Q4356 identifies AbioMem or AbioHydro wound-covering material, counted by the square centimeter. A clinician may use the material during treatment of a wound in a physician office, hospital outpatient department, or wound clinic. The product code represents the material; the clinician’s wound assessment and application are represented by the associated procedure coding. For example, skin-substitute application procedures may be reported for covered anatomic sites and wound areas.
Report Q4356 only with a primary procedure, not as a standalone service. Document the product used and the square-centimeter quantity furnished, along with the wound and application details supporting the primary procedure. CMS treats this as an add-on code and includes its payment within the primary procedure’s global period. It is also a technical-component-only code; a separate code accounts for 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.
Where Q4356 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 | $134.64 | Unavailable |
| Beaumont | $115.80 | Unavailable |
| Brazoria | $126.11 | Unavailable |
| Dallas | $126.75 | Unavailable |
| Fort Worth | $125.48 | Unavailable |
| Galveston | $126.37 | Unavailable |
| Houston | $126.37 | Unavailable |
| Rest Of Texas | $120.77 | Unavailable |
How the Q4356 rate is calculated
Each of Q4356’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 · Q4356
RVUs × geographic indexes × conversion factor
Swap in your local Medicare rate.
Work 0.00Practice expense 3.81Malpractice 0.00
All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.
Payment rules and modifiers for Q4356
The CMS indicators that decide how Q4356 is paid alongside other services.
CMS payment indicators · Q4356
Wound matrix
| 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. |
Q4356 compared with similar codes
Compare codes
Q4356 vs Q4355 vs Q4363: national Medicare rates
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How to choose
- Q4355Wound material
- Q4355 identifies AbioXPL or AbioXPL Hydro; Q4356 identifies AbioMem or AbioHydro. Select according to the product used, not just the wound area.
- Q4363Amniotic membrane
- Q4363 identifies a different amniotic membrane product. Q4356 applies when the furnished product is AbioMem or AbioHydro.
Q4356 billing questions
How is Q4356 different from Q4355?
Q4356 identifies AbioMem or AbioHydro, while Q4355 identifies AbioXPL or AbioXPL Hydro. Use the code matching the product actually furnished.
Can Q4356 be billed by itself?
No. CMS identifies it as an add-on code that must be reported with a primary procedure.
What does one unit represent?
The code is measured per square centimeter. Report the quantity corresponding to the product area furnished, supported by the application documentation.
Does Q4356 include wound application or interpretation?
Q4356 identifies the material, while the primary procedure represents the associated wound service. CMS classifies Q4356 as technical-component-only, with interpretation represented by a separate code.
What documentation supports Q4356?
Document whether AbioMem or AbioHydro was used, the wound treated, the area of product furnished, and the associated primary 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
Show the CMS file lines behind this rate
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