HCPCS Q4318: Wound graftMedicare rate & RVUs in Guam
Q4318 reports E-Graft by square centimeter when supplied for wound treatment and billed with the applicable primary procedure.
Medicare pays $144.69 for Q4318 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 Q4318 covers
Q4318 identifies E-Graft, a product used as wound coverage during wound treatment. A wound-care clinician may use it in an outpatient wound clinic or hospital outpatient department as part of a procedure addressing a chronic or complex wound. The code represents the product quantity, not the clinician’s evaluation or the work of applying it.
Report Q4318 only with an applicable primary procedure; it is not a stand-alone service. The primary procedure depends on the wound’s location and the service performed. Document the product used and the square-centimeter quantity reported, along with the wound and the associated procedure. CMS treats Q4318 as an add-on paid within the primary procedure’s global period. It is 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.
Q4318 in Hawaii, Guam
| Payment locality | Office | Facility |
|---|---|---|
| Hawaii, Guam | $144.69 | Unavailable |
How the Q4318 rate is calculated
Each of Q4318’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 · Q4318
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 Q4318
The CMS indicators that decide how Q4318 is paid alongside other services.
CMS payment indicators · Q4318
Wound 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. |
Q4318 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4317Vitograft
- Q4317 identifies Vitograft, while Q4318 identifies E-Graft. Select the code for the product actually supplied.
- Q4319Wound graft
- Q4319 identifies Sanograft rather than E-Graft. The per-square-centimeter unit does not make the products or codes interchangeable.
- Q4310Procenta, per 100 mg
- Q4310 identifies Procenta and uses a per-100-mg unit; Q4318 identifies E-Graft and is reported per square centimeter.
Q4318 billing questions
Can Q4318 be billed by itself?
No. CMS identifies it as an add-on code that must be billed with a primary procedure. Its payment falls within that procedure’s global period.
How should the quantity be determined?
Use the square-centimeter unit specified for Q4318 and document the E-Graft quantity associated with the wound procedure.
Which primary procedure should accompany Q4318?
Use the applicable wound-treatment procedure for the service and anatomical site. For example, skin-substitute application codes such as 15271 or 15275 may be relevant, depending on the site.
Does Q4318 include interpretation?
No. CMS classifies Q4318 as technical-component-only; a separate code covers interpretation.
Can another wound product code be substituted for Q4318?
No. Report the HCPCS code identifying the product actually used. Similar units or wound uses do not make product-specific codes interchangeable.
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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