HCPCS Q4123: AlloSkin graftMedicare rate & RVUs in Washington
Report Q4123 for AlloSkin graft material used during a qualifying application procedure, such as coverage of a prepared lower-leg wound.
Medicare pays $134.00–$156.14 for Q4123 in the office in Washington, from Rest Of Washington to Seattle (King Cnty). 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 Q4123 covers
Q4123 identifies AlloSkin material used to cover a wound during a graft application. A clinician, such as a surgeon or wound-care physician, prepares the wound bed and places the material in a clinic or surgical setting. A lower-leg ulcer requiring graft coverage is a typical context. This code identifies the AlloSkin material, not the clinician’s work of preparing the wound and applying the graft.
Report Q4123 with the primary procedure that describes the application; CMS designates it an add-on code and pays it within the primary procedure’s global period. The record should identify AlloSkin, the wound site, the amount used, and the application performed. Select the application code from the treated body site and wound area rather than from the product name. CMS classifies Q4123 as technical-component-only; a separate code covers interpretation when an interpretation service is reported. Q4115 also carries an AlloSkin short label, so the short descriptor alone cannot resolve which product code belongs on a claim.
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 Q4123 pays more and less in Washington
| Payment locality | Office | Facility |
|---|---|---|
| Rest Of Washington | $134.00 | Unavailable |
| Seattle (King Cnty) | $156.14 | Unavailable |
How the Q4123 rate is calculated
Each of Q4123’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 · Q4123
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 Q4123
The CMS indicators that decide how Q4123 is paid alongside other services.
CMS payment indicators · Q4123
AlloSkin graft
| 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. |
Q4123 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4115Skin substitute
- Both codes have an AlloSkin short label. Do not choose between them from the abbreviated descriptor alone; verify the applicable product coding details.
- Q4121Skin substitute
- Use Q4123 for AlloSkin material and Q4121 for TheraSkin material; select by the product actually applied.
- 15271Skin substitute graft
- Q4123 identifies AlloSkin material. 15271 describes application of a skin substitute graft to a qualifying wound on the trunk, arms, or legs.
Q4123 billing questions
Does Q4123 replace the graft application code?
No. Q4123 is an add-on for AlloSkin material and must be reported with the primary application procedure. CMS pays it within that procedure’s global period.
How should Q4123 be distinguished from Q4115?
Both have an AlloSkin short descriptor in the supplied code list. Confirm the applicable product coding details before choosing between them; the short labels alone do not establish a distinction.
Can Q4123 be used for TheraSkin or Oasis tri-layer wound matrix?
No. Q4123 identifies AlloSkin; Q4121 identifies TheraSkin, and Q4124 identifies Oasis tri-layer wound matrix.
What documentation supports Q4123?
Document that AlloSkin was used, the wound site, the amount of material used, and the procedure in which it was applied.
Does Q4123 include a professional interpretation?
CMS classifies Q4123 as technical-component-only. A separate code covers interpretation when that service is reported.
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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