HCPCS code Q4108 – Integra Matrix

Key takeaways

HCPCS Code Q4108 reports Integra Matrix Wound Dressing per square centimeter, as an add-on to a primary skin substitute application code such as CPT 15271–15278.

Q4104 is a separate code for Integra Bilayer Matrix Wound Dressing (BMWD), and Q4105 covers Integra DRT or Omnigraft.

Each unit is one square centimeter of product; follow your payer’s or MAC’s rules for discarded product and fractional units.

From CY 2026, Medicare pays skin substitutes used in a physician office as incident-to supplies under the Physician Fee Schedule.

Pabau, the practice management platform we build, tracks prior authorization on each case and sends US claims through Claim.MD.

HCPCS Code Q4108: Definition, descriptor, and code range

HCPCS Code Q4108 is the Level II code for Integra Matrix Wound Dressing, reported per square centimeter applied to a qualifying chronic wound. It is an add-on code, so it is always reported with a primary skin substitute application procedure. It sits in the Q4100 series of HCPCS codes, the CMS block of temporary codes for skin substitute products.

Codes in the Q4100 series name specific products rather than product categories. That is why Integra’s wound care range spans several separate codes. The code on the claim tells the payer which product was applied, so it must match the product label in the chart.

What Q4108 covers and what it excludes

Q4108 reports Integra Matrix Wound Dressing applied to a chronic wound that meets the payer’s coverage criteria. Coverage depends on the payer, the MAC jurisdiction, and the diagnosis on the claim.

Covered indications

• Diabetic foot ulcers (DFUs) that have not healed with documented standard wound care
• Venous leg ulcers (VLUs) that have not responded to standard compression therapy

Coverage turns on the diagnosis codes on the claim. A type 2 diabetic foot ulcer, for example, is usually coded as E11.621 plus an L97 code for the ulcer’s site and severity.

The MACs withdrew their planned 2026 skin substitute LCDs on December 24, 2025. Coverage now follows your MAC’s active policy or general medical necessity rules, so check both before you apply the product.

Common exclusions

• Cosmetic or elective wound closure procedures
• Acute wounds that do not meet the payer’s chronicity criteria
• Wounds where standard wound care, including debridement where indicated, has not been tried and documented
• Diagnoses outside the covered list in your MAC’s or payer’s active policy

Clinical application and Q4108 documentation requirements

Documentation for Q4108 must establish medical necessity, confirm the product applied, and record the measurements behind the units. A claim that pays without adequate documentation is a future audit liability.

Application steps

1. Wound preparation: Debride the wound bed to viable tissue. Document the debridement procedure and the wound bed condition post-preparation.
2. Wound measurement: Measure wound length and width in centimeters. Record both dimensions and the calculated area (length x width = sq cm) in the clinical note at the time of application.
3. Product selection: Record the product name (Integra Matrix Wound Dressing), lot number, expiration date, and size of the piece applied.
4. Application: Apply the dressing per manufacturer protocol. Document any trimming, the final applied area in sq cm, and any product waste.
5. Post-application note: Record the physician order authorizing application, clinical rationale for skin substitute use, and wound response to date.

Documentation checklist

• Wound measurements (length x width) with calculated sq cm area
• Product name, lot number, and expiration date
• Applied surface area in sq cm (may differ from wound area if trimmed)
• Discarded area in sq cm if unused product is thrown away
• Primary application procedure code (CPT 15271–15278) for the same session
• Physician order for skin substitute application
• Clinical note confirming covered diagnosis and failed prior treatment
• Prior authorization reference number (if required by the payer)

How to calculate and report Q4108 units

Q4108 is reported per square centimeter of Integra Matrix Wound Dressing. Record the wound area, the product sheet size, the area applied, and any product you discard.

Formula: Applied length (cm) x applied width (cm) = square centimeters applied

Payers differ on how to report discarded product and fractional square centimeters. Follow your payer’s or MAC’s unit rules, and keep the measurements in the note to support the units you report.

Because Q4108 is an add-on code, it is never reported alone. Pair it with the application code that matches the wound site and total area. That is CPT 15271 for the trunk, arms, or legs, or CPT 15275 for sites such as the feet and hands.

Q4108 vs. Q4104: How to choose the right code

Q4108 and Q4104 are often confused because both name Integra products and both are reported per square centimeter. They are separate codes for separate products, not versions of one product. Q4108 reports Integra Matrix Wound Dressing, while HCPCS code Q4104 reports Integra Bilayer Matrix Wound Dressing (BMWD). Check the product label in the chart before you choose a code.

If two different Integra products are applied to two separate wounds in one session, document each wound with its own measurements. Then report each product under its own code. Never report one product’s area under another product’s code.

Neighboring codes often billed alongside Q4108

Q4108 always appears with a primary application code, and often with a debridement code such as CPT 97597 or an E&M visit code. Knowing which pairs trigger bundling edits prevents avoidable denials.

Medicare and payer coverage for Q4108

Medicare coverage for Q4108 follows your MAC’s active policy, since no single national policy covers skin substitutes. The 2026 skin substitute LCDs were withdrawn on December 24, 2025, so check what your MAC currently has in force. The MAC also decides which diagnoses it covers and what documentation it expects.

From CY 2026, CMS pays skin substitutes as incident-to supplies under the Physician Fee Schedule (CMS CY 2026 Physician Fee Schedule final rule). That applies when the product is used with a covered application procedure in a non-facility setting. Hospital outpatient payment follows the OPPS instead.

Reimbursement rates for Q4108 vary by geography, place of service, and fee schedule year. CMS updates the Physician Fee Schedule annually; never use a prior-year rate as a current billing estimate. The CMS Physician Fee Schedule lookup provides current payment amounts by HCPCS code and locality.

Common Q4108 claim denial reasons and how to avoid them

Denials for Q4108 follow predictable patterns. Most can be prevented with pre-submission checks rather than resolved through appeals. The table below maps the most common denial reasons to their root causes and prevention steps.

Several of these denials can be caught before the claim goes out. Pabau’s claims management software tracks the prior authorization code, dates, and sessions on each case and warns you when the auth code is missing. US claims go out through Claim.MD as CMS-1500/837P claims, with eligibility checks before the visit.

Place of service and modifier guidance for Q4108

The place of service code on a Q4108 claim affects the payment rules that apply. A POS code that does not match the care setting can lower payment or trigger an audit flag.

Key modifiers for Q4108 claims:

• 59: Distinct procedural service; use on debridement only when it is separate from the application, such as a different wound site
• RT / LT: Right side / left side; identifies the treated side when wounds are on both sides
• 25: Significant, separately identifiable E&M service on the same date as a procedure; apply to the E&M code, not Q4108
• GA: Waiver of liability statement (ABN) on file; use when you expect Medicare to deny the service as not reasonable and necessary
• GY: Item or service statutorily excluded or not a Medicare benefit; no ABN is needed
• GZ: Item or service expected to be denied as not reasonable and necessary; signals an ABN was not obtained

How practice management software supports Q4108 billing

Wound care practices that report Q4108 carry a heavy documentation and prior authorization load. A missed auth, an undocumented measurement, or a missing primary procedure code each sends the claim back for rework.

Pabau keeps the prior authorization on the patient’s case, with the auth code, dates, and sessions in one place. A warning appears when the auth code is missing, so your team can chase it before the visit.

Claims go to US payers through Claim.MD as CMS-1500/837P claims, with eligibility checks before service. Electronic remittance advice (ERA) comes back the same way, so denial reason codes reach your billing team without paper EOBs.

Structured digital forms capture wound measurements, lot numbers, and product details at the point of care. With that documentation in the patient record, the coder has the measurements needed to support the Q4108 units.

See how Pabau supports HCPCS billing for wound care practices

Pabau tracks prior authorizations on each case, warns you when an auth code is missing, and sends US claims through Claim.MD.

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Conclusion

Choose the Integra code from the product label in the chart, and pair Q4108 with the application code for the wound site. Record the applied and discarded areas at the time of application, because those notes are what support the units.

Coverage is the part that moved in 2026. With the skin substitute LCDs withdrawn, check your MAC’s active policy before each new case instead of relying on last year’s rules.

For the wider billing picture, see how revenue cycle management connects authorization, coding, and payment. Book a demo to see how Pabau keeps prior authorizations and Q4108 claim documentation on one case.

Continue your research

Need to understand denial codes on rejected Q4108 claims? Denial codes in medical billing explains the most common CARC codes and how to respond to each one.

Looking for guidance on what a clean claim looks like before submission? Clean claim requirements covers the elements every HCPCS claim must include to pass payer edits.

Want to understand how electronic remittance advice speeds up posting? Electronic remittance advice explains 835 ERA files and how they connect to your billing workflow.

Frequently asked questions