HCPCS code Q4373: Membrane graft, wrap LT, per square centimeter2026 Medicare rate & RVUs in Illinois
Q4373 reports Membrane Wrap LT by square centimeter when this specific wound-covering product is supplied for application with a primary wound-treatment procedure.
Medicare pays $116.19–$130.69 for Q4373 in the office in Illinois, from Rest of Illinois to Suburban Chicago, IL. 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.
Your location
On this page 9 sections
What Q4373 covers
Q4373 identifies the Membrane Wrap LT wound-covering product, reported by the square centimeter supplied for application to a wound. It represents the product, not the clinician’s wound-bed preparation or placement work. A wound-care practitioner may use it in an outpatient office or hospital setting to cover a prepared wound, such as a chronic ulcer. The product name in the clinical and supply records should support choosing Q4373 rather than a code for a different membrane or skin substitute.
Report the product quantity in square-centimeter units with the applicable primary wound-treatment procedure. Documentation should identify the product, treated site, wound dimensions or area, and quantity applied. CMS classifies Q4373 as an add-on paid within the primary procedure’s global period, so it is not paid as a stand-alone service. It is technical-component-only; a separate code covers interpretation. Report the practitioner’s placement work under the appropriate application service, not as part of this product code.
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 Q4373 pays more and less in Illinois
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
4 payment localities
$116.19 to $130.69
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | $127.89 | Unavailable |
| East St. Louis, IL | $117.08 | Unavailable |
| Rest of Illinois | $116.19 | Unavailable |
| Suburban Chicago, IL | $130.69 | Unavailable |
How the Q4373 rate is calculated
Each of Q4373’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 · Q4373
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 Q4373
The CMS indicators that decide how Q4373 is paid alongside other services.
CMS payment indicators · Q4373
Membrane graft, wrap LT, per square centimeter
| 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. |
Q4373 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- Q4372AmchoPlast EXCLPer square centimeter
- Q4372 identifies Amchoplast Excl; use Q4373 for Membrane Wrap LT. Select the product code from the specific product documented, not merely the wound site.
- Q4375Wound graftDuograft AC, per square centimeter
- Q4375 identifies Duograft AC, a different named product. Q4373 is specific to Membrane Wrap LT.
- Q4371Wound productNeoguard, per square centimeter
- Q4371 identifies Neoguard. Do not substitute it for Q4373 when the product record identifies Membrane Wrap LT.
Q4373 billing questions
Can Q4373 be billed by itself?
No. CMS classifies it as an add-on that must be billed with a primary procedure and is paid within that procedure’s global period.
How are units determined?
Report the product quantity in square centimeters. Documentation should connect the quantity to the treated wound and the amount applied.
Does Q4373 include the clinician’s application work?
No. Q4373 identifies the Membrane Wrap LT product; report the applicable wound-treatment or application service separately.
Does this code include interpretation?
No. CMS identifies Q4373 as technical-component-only, with interpretation covered by a separate code.
What documentation supports reporting Q4373?
Record the Membrane Wrap LT product identity, treated site, wound area, and quantity applied. The records should distinguish it from other membrane or skin-substitute products.
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
Fee sheets · Coming soon
Put Q4373 and the rest of your codes on one sheet
Your codes at your locality, with payer contracts beside Medicare.
Join the waitlist