HCPCS Q4390: Skin substituteMedicare rate & RVUs in Utah
Report Q4390 for the Ascendion wound product by square centimeter when it is furnished with a primary wound procedure.
Medicare pays $119.62 for Q4390 in the office in Utah (Utah). 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 Q4390 covers
Q4390 identifies the Ascendion wound product, measured in square centimeters. It is reported when the product is furnished for wound treatment, such as in an outpatient wound clinic or a podiatry or surgical practice. The product code is separate from the procedure used to prepare the wound and apply the product; for example, the application may be reported with the appropriate skin-substitute application code.
Report the quantity in square centimeters supported by the record and use Q4390 only with a primary procedure. CMS treats it as an add-on code, with payment included within that procedure’s global period. It is a technical-component-only code: a separate code covers interpretation. Documentation should identify Ascendion as the product used and support the quantity reported, along with the wound and the associated primary procedure. The product quantity is not established solely by documenting the wound’s dimensions.
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.
Q4390 in Utah
| Payment locality | Office | Facility |
|---|---|---|
| Utah | $119.62 | Unavailable |
How the Q4390 rate is calculated
Each of Q4390’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 · Q4390
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 Q4390
The CMS indicators that decide how Q4390 is paid alongside other services.
CMS payment indicators · Q4390
Skin substitute
| 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. |
Q4390 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 15271Skin substitute graft
- 15271 reports application work for eligible wounds; Q4390 reports the Ascendion product quantity. They represent different parts of the wound treatment.
- Q4391Wound product
- Q4391 identifies Amnioplast Double, not Ascendion. Select the product code that matches the material furnished.
- Q4392Skin substitute
- Q4392 identifies Grafix Duo, not Ascendion. These product-specific codes are not interchangeable merely because both are reported per square centimeter.
Q4390 billing questions
How is Q4390 different from the Ascendion application procedure?
Q4390 identifies the product by square centimeter. Report the appropriate application procedure separately for the work of applying the product.
Can Q4390 be billed by itself?
No. CMS classifies it as an add-on code that must be billed with a primary procedure.
What quantity should the record support?
Document the Ascendion product and the square-centimeter quantity reported. Wound dimensions alone do not establish the product quantity.
How does the global-period rule affect payment?
Payment for Q4390 falls within the global period of the primary procedure. It is not paid as a separate service outside that procedure’s global period.
Does Q4390 include interpretation?
No. CMS identifies Q4390 as technical-component-only; a separate code covers interpretation.
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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