HCPCS code Q4359: Wound matrix, choriply, per square centimeter2026 Medicare rate & RVUs in California

Medicare pays $139.47–$183.51 for Q4359 in the office in California, from Bakersfield, CA to Santa Clara County, CA. 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.

What Q4359 covers

Q4359 identifies the Choriply placental-derived wound matrix supplied for wound treatment; it represents the product, not the clinician’s work to prepare or apply it. Clinicians may use a wound matrix as part of care for a wound such as a chronic ulcer. The treating practitioner documents the wound and performs the associated application procedure in an office, hospital outpatient department, or other appropriate care setting.

Report the product in square-centimeter units and pair it with the applicable primary application procedure; the product code cannot stand alone. Documentation should identify Choriply, the treated wound, the amount supplied or applied in square centimeters, and the related procedure. CMS classifies Q4359 as an add-on paid within the primary procedure’s global period. CMS also classifies it as technical-component-only, with interpretation covered by a separate code when applicable; Q4359 represents the product rather than a professional 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 Q4359 pays more and less in California

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

29 of 29 payment localities

How the Q4359 rate is calculated

Each of Q4359’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.

Payment rules and modifiers for Q4359

The CMS indicators that decide how Q4359 is paid alongside other services.

Q4359 compared with similar codes

How to choose

15271Skin substitute graftFirst 25 cm², trunk/limbs

15271 reports a primary skin-substitute application service for eligible trunk, arm, or leg wounds. Q4359 reports the Choriply product and is paired with an appropriate primary procedure.

15272Skin substitute graftAdditional trunk, arm, or leg area

15272 reports an additional application service when applicable; it is not a product code. Q4359 reports Choriply by square centimeter.

Q4360Amniotic membraneAmchoPlast FD, per square centimeter

Q4360 identifies Amchoplast FD, not Choriply. Select the code for the specific product furnished.

Codes related to Q4359

Related codes aren’t interchangeable: bill the code that matches the service performed.

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

Open CMS sourceHow we calculate rates