HCPCS code Q4103: Oasis Burn Matrix billing, coverage, and reimbursement

Key takeaways

HCPCS code Q4103 is Oasis Burn Matrix, billed per square centimeter of product applied to the wound

Q4103 is an add-on code, so it must be listed separately alongside the primary skin substitute application procedure

Oasis Wound Matrix is a different product that bills under Q4102, and swapping the two codes is an auditable error

From January 1, 2026, Medicare pays non-biologic skin substitutes as incident-to supplies at a single rate per square centimeter

Practice management software like Pabau pairs Q4103 with its primary code, checks modifiers, and cuts denials

HCPCS code Q4103 is a Level II Healthcare Common Procedure Coding System (HCPCS) Q-code maintained by the Centers for Medicare and Medicaid Services (CMS). Its official long descriptor is “Oasis burn matrix, per square centimeter (add-on, list separately in addition to primary procedure).”

The code identifies one specific skin substitute product and the quantity of it applied to the wound. That add-on wording is not decorative. Q4103 reports a supply, so it only belongs on a claim next to the application procedure code it goes with.

The product itself is Oasis Burn Matrix. Do not confuse it with Oasis Wound Matrix, which bills under Q4102. The two descriptors differ by a single word in the middle of the string. That similarity is the most common source of Q4103 coding errors.

The descriptor is the safest way to confirm you have the right code. Verify it against the AAPC HCPCS Level II code database before you build Q4103 into a charge template. CMS can update Q-code descriptors quarterly without a formal rulemaking cycle.

What Q4103 covers: Oasis Burn Matrix and its clinical use

Q4103 covers Oasis Burn Matrix, a natural extracellular matrix derived from two layers of porcine small intestinal submucosa. Despite the name, its cleared indications reach well beyond burns.

The product is indicated for partial- and full-thickness wounds, second-degree burns, and a broad set of chronic wounds. Wound care teams encounter this code most often in outpatient hospital departments and physician offices.

• Burn indications: second-degree burns, donor sites, and grafts. It is not indicated for third-degree burns
• Chronic wound types: diabetic ulcers, venous ulcers, chronic vascular ulcers, pressure injuries
• Other wound types: trauma wounds, surgical wounds, tunneled or undermined wounds, draining wounds
• Care settings: physician office, hospital outpatient department, ambulatory surgical center
• Product form: sheet matrix, applied directly to the wound bed
• Measurement basis: billed per square centimeter (cm²) of matrix actually applied, not the size of the wound

Billing Q4103 per square centimeter means the units must reflect the area of product applied. Billing the wound size instead of the product size is a common and auditable error.

Document the exact cm² of product used in the procedure note before submitting the claim. Recording that measurement in the room is more reliable than reconstructing it from the packaging later.

Q4103 or Q4102: Telling the two Oasis codes apart

Q4102 and Q4103 both describe an Oasis product, both bill per square centimeter, and both are add-on codes. What separates them on a claim is which product the clinician applied.

Match the code to the product label and lot number recorded in the procedure note. Never pick the code from the wound type. Oasis Burn Matrix is cleared for diabetic, venous, and pressure wounds as well as burns. A diabetic foot ulcer dressed with Burn Matrix still bills under Q4103.

Medicare coverage and eligibility for HCPCS code Q4103

Medicare Part B covers HCPCS code Q4103 subject to the applicable Local Coverage Determination (LCD) issued by the Medicare Administrative Contractor (MAC) for your jurisdiction. Because LCDs are jurisdiction-specific, coverage criteria for Q4103 can differ meaningfully between contractors such as Novitas Solutions and CGS Administrators.

Confirming the active LCD in your MAC region is a prerequisite for billing, not an optional step. Verifying the patient’s eligibility at or before the point of service reduces the risk of retroactive denials.

LCDs governing skin substitute Q-codes generally expect a wound that has failed a documented course of standard care. Most also limit the number of applications per wound per episode. Verify both against the LCD active in your jurisdiction on the date of service, since CMS revises these periodically.

Documentation requirements for Q4103 claims

The medical record has to carry every element the LCD asks for before Medicare will pay for Q4103. The list below is what a MAC reviewer expects to find when a Q4103 line is pulled for audit.

• A chronic or acute wound that meets the LCD’s clinical threshold, usually a set number of weeks without response to standard wound care
• Prior conservative treatment documented in the medical record, such as debridement, moisture-retentive dressings, or offloading for diabetic foot wounds
• A supported ICD-10-CM diagnosis code linked to the wound type (see the related codes section below)
• Wound measurements recorded at each visit where the product is applied, covering length, width, and depth or area in cm²
• The exact square centimeters of Oasis Burn Matrix applied, which is the figure you bill as units
• The product name and lot number from the package, which is what distinguishes a Q4103 claim from a Q4102 claim under audit
• A physician or qualified non-physician practitioner order for the skin substitute application
• The National Drug Code (NDC), if the MAC LCD requires it on the claim line

Keep a record of every skin substitute application, including a photograph of the product packaging. A photo of the label settles a Q4102 or Q4103 question that a typed product name cannot.

Prior authorization requirements for Q4103

Prior authorization requirements vary by payer and by plan. Medicare fee-for-service does not universally require prior authorization for Q4103. Medicare Advantage plans and commercial payers often do impose their own rules. Several treat skin substitutes as a high-cost category with a standing review requirement.

Verify the requirement with each individual payer before the procedure rather than after it. An application performed without an approved authorization is rarely recoverable on appeal, because the product has already been used.

Reimbursement for Q4103 under the 2026 payment rules

Medicare changed how it pays for skin substitutes on January 1, 2026. Products not licensed as biologics under Section 351 of the Public Health Service Act are now treated as incident-to supplies. CMS pays for them separately during a covered application procedure. That applies in non-facility settings under the Physician Fee Schedule and in hospital outpatient settings under OPPS.

For CY2026, CMS finalized a single initial rate of $127.14 per square centimeter, before geographic adjustment. That one rate applies across all three FDA regulatory groupings CMS now recognizes. The groupings are 361 HCT/Ps, 510(k)-cleared devices, and premarket approval products. CMS has said it intends to pay the groups at different rates in later years.

Oasis Burn Matrix is FDA-cleared rather than licensed as a biologic, so it sits inside the group CMS moved onto the single rate. Confirm the current amount against the CMS Physician Fee Schedule lookup tool for your locality before billing. Never carry a prior-year figure into a current claim.

Capturing the product area on the charge sheet at the point of care beats calculating it later. That habit cuts the unit billing errors behind underpayments and recoupment requests.

How to bill HCPCS code Q4103: Claim filing instructions

Submitting Q4103 correctly requires the right combination of primary procedure code, place-of-service code, modifiers, diagnosis codes, and units. Each element is independently validated by the payer’s claim processing system. A single mismatch stops the claim. The panel below shows how those elements sit across the two claim lines.

Practices that run these checks inside wound care billing software can pre-populate modifier and diagnosis rules for skin substitute codes. Errors then surface before the claim leaves the system.

1. Confirm which Oasis product was applied. The package label and lot number decide whether the claim carries Q4103 or Q4102. Record both in the procedure note.
2. Verify coverage and eligibility before the appointment. Confirm the plan covers skin substitute applications and whether a prior authorization is required.
3. Document wound and product measurements at the encounter. Record the wound area in cm² and the exact cm² of product applied. The second figure is what you bill.
4. Bill the primary application procedure. Q4103 is an add-on code, so the claim must also carry the CPT application code for the body site treated.
5. Select the correct ICD-10-CM diagnosis code that matches the wound type and is supported by the active MAC LCD for Q4103.
6. Apply the correct modifiers based on the place of service and any lateralization or distinct-service rules (see the modifiers section below).
7. Enter the units as the number of square centimeters of product applied, rounded per payer instructions. Do not include product you discarded.
8. Include the NDC number on the claim line if the MAC or payer requires it for skin substitute products.
9. Submit via the CMS-1500 form or the applicable electronic 837P transaction, with the supporting documentation attached or available on request.

Modifiers used with Q4103

Modifier requirements for Q4103 depend on the place of service, the LCD attestation your MAC expects, and whether the wound is lateralized. Always verify modifier rules with the applicable MAC LCD and payer policy, since these differ by jurisdiction.

The JW row is worth a second look if your team built its skin substitute rules before 2026. Wastage on a non-biologic skin substitute is no longer payable, so a JW line will not recover the cost of an unused portion. It only invites a denial.

Codes billed alongside Q4103

Q4103 is never billed in isolation. The encounter always involves a procedure code for the application itself, plus one or more ICD-10-CM diagnosis codes that establish medical necessity. On the trunk, arms, or legs that application code is usually 15271.

The table below lists the codes most commonly paired with Q4103. Confirm each one is covered under the active MAC LCD before you submit.

Always use the most specific ICD-10-CM code available rather than an unspecified one. MAC auditors flag claims where a skin substitute Q-code is paired with a non-specific diagnosis while a more specific code sits documented in the record.

When the documented wound type does not match a row in the table above, work from the wider ICD-10-CM code index before you submit.

Common billing errors and how to avoid them

Q4103 claims fail at a higher rate than many other HCPCS codes. The requirements are granular, and the audit risk for skin substitutes is elevated. Nine error patterns account for most of the rejections, and each one is caught by a check the biller can run before submission.

How Pabau keeps Q4103 claims complete before they go out

In many wound care practices the facts that decide a Q4103 claim are captured in the treatment room and re-keyed later. Someone reads the product label, someone measures the graft, and someone else builds the claim from a note written hours earlier.

Each handoff is a chance for Burn Matrix to become Wound Matrix, or for the applied area to become the wound area.

Practice management software like Pabau closes that distance. The product name, lot number, and applied square centimeters go into the clinical note at the point of care. The claims side of the platform then carries those same values straight onto the claim.

Modifier and diagnosis rules for skin substitute codes sit on the charge itself. A missing KX or an unsupported ICD-10-CM code surfaces before submission, not in a remittance advice.

The outcome your billing team feels is a shorter denial queue and fewer claims reworked from memory. The outcome your finance lead feels is a wound care service line that gets paid on the first pass.

Reduce skin substitute claim denials before they happen

Pabau’s claims management software pre-validates modifier rules and links diagnosis codes to skin substitute Q-codes. Wound care and dermatology practices track reimbursement by procedure, so Q4103 claims go out complete the first time.

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Conclusion

Q4103 is one of the easier skin substitute codes to get wrong, and the reasons have little to do with clinical judgment. The descriptor names Oasis burn matrix, not wound matrix.

The code is an add-on, so it never travels alone on a claim. And from January 2026 the payment basis is an incident-to supply rate rather than a product-specific fee, with no allowance for wastage.

Get those three points right at the point of care, not at claim submission. That is what separates a clean Q4103 claim from a recoupment letter. Record the product label, the applied area, and the primary procedure in the same note, on the same visit.

Book a demo to see how Pabau handles skin substitute code validation, modifier rules, and diagnosis-code crosschecks in a live clinical environment.

Continue your research

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Want fewer Q4103 lines coming back for rework? What makes a clean claim walks through the fields payers validate before a claim is accepted on the first pass.

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