HCPCS code Q4176 – Neopatch and Therion skin substitute billing

Key takeaways

HCPCS code Q4176 bills Neopatch or Therion skin substitute per square centimeter, as an add-on to the application procedure.

Units equal the wound area covered that day, rounded to a whole number under your MAC’s policy.

Every claim pairs Q4176 with a CPT 15271–15278 application code and an ICD-10 diagnosis from the LCD’s covered list.

From January 1, 2026, Medicare pays skin substitutes as incident-to supplies at about $127.28 per square centimeter.

Medicare Advantage and commercial plans often require prior authorization, so confirm it before the first application.

HCPCS code Q4176 is a 2026 add-on code for Neopatch and Therion

HCPCS code Q4176 is an active HCPCS Level II code for Neopatch or Therion skin substitute, billed per square centimeter. The Centers for Medicare & Medicaid Services (CMS) maintains it. In the 2026 code set, its descriptor also marks it as an add-on, listed separately from the primary application procedure.

Because both products share one code, the claim never has to tell them apart. Still, check Q4176 against the current CMS HCPCS Level II code set before you bill. CMS revises Q-code descriptors and assignments on a regular cycle.

Neopatch and Therion are two products billed under one code

Both are tissue-based skin substitutes used to help chronic or complex wounds close. The clinician places the product over a prepared wound bed, where it works as a temporary cover.

• Neopatch: A dehydrated human placental membrane made of both amnion and chorion, as described in its CMS coding application. It’s applied externally as a wound covering, including on diabetic foot ulcers and venous leg ulcers.
• Therion: The second product named in the same descriptor. It’s used for similar wound types and bills on the same per-square-centimeter unit.
• One code for both: CMS gives the two products a single descriptor. So the claim line reads Q4176 whichever product the clinician applied.

The clinical note should still name the exact product. Auditors compare the chart with the claim, and a note naming Neopatch backs up a Q4176 line. Billing either product under a different Q code is a miscoding error. It usually ends in a denial or a later recoupment.

Q4176 pays for the product, never the application work

Q4176 covers the supply of Neopatch or Therion on a wound that meets the payer’s coverage criteria. The application procedure goes on its own CPT line. Here’s a quick way to sort what belongs where.

Covered: The product supply (Neopatch or Therion), billed per square centimeter of wound area treated at the time of application.

Not covered under Q4176:

• Any other skin substitute product, even a clinically similar one. Each product in the Q4100 series has its own Q code.
• Debridement or wound preparation services, which you bill separately with the right CPT debridement code.
• The application procedure itself, which uses a code from the CPT 15271–15278 series.
• Repeat applications beyond payer-approved frequency limits without prior authorization.

The diagnosis has to fit as well. It must match a wound type listed in the applicable Local Coverage Determination (LCD). A diagnosis outside that list is one of the leading denial triggers for this code family.

Units for HCPCS code Q4176 equal the square centimeters you cover

Units for HCPCS code Q4176 equal the wound’s surface area in square centimeters at the time of application. That makes the ruler the most important billing tool in the room. In fact, measurement slips are the most common unit mistake on skin substitute claims.

Work through these five steps at every application visit:

1. Measure the wound: Record the longest length and the widest perpendicular width in centimeters. Use a sterile disposable ruler or a calibrated measuring tool during the visit.
2. Calculate the area: Multiply length by width (L x W = sq cm). For irregular wounds, use the ellipse formula (L x W x 0.785) or planimetry software.
3. Bill the area covered: Bill for the wound area the product covered, not the full graft size before trimming. Billing the larger graft size creates an overpayment risk.
4. Round per payer policy: Most Medicare Administrative Contractors (MACs) round to the nearest whole square centimeter. Confirm your MAC’s rounding rule before you submit.
5. Enter the units: Put the square-centimeter figure in the units field of the Q4176 claim line. Don’t apply any conversion factor.

Next, get the numbers into the note. Auditors often request the progress note to check that billed units match the recorded dimensions. A mismatch counts as a billing error, whatever the intent.

Every Q4176 claim needs an application code and a covered diagnosis

Q4176 covers the product supply only. So every valid claim also carries a CPT application code, such as CPT 15271, plus a supported ICD-10 diagnosis. The table shows where each companion code fits.

Treat the ICD-10 codes above as examples. Covered diagnoses vary by contractor, so confirm them against your MAC’s LCD before billing.

Here’s how one Q4176 claim moves from chart to payment

Take the 3 cm by 4 cm wound from the unit table. Once it’s measured, it turns into three claim lines and one Medicare payment. The flow below follows it from the ruler to the remittance.

At each handoff, one person owns the check. The clinician owns the measurement and the product name. Then the coder matches the diagnosis to the LCD, and the biller confirms prior authorization before the claim goes out.

Q4175 is the neighbor code most often confused with Q4176

Q4175 (Miroderm) is the code billers mix up with Q4176 most often. Both are Q4100-series skin substitutes billed per square centimeter. However, they cover different products, and the wrong one invites recoupment.

So which code do you pick? Read the product label recorded in the chart. If it says Neopatch or Therion, bill Q4176. If it says Miroderm, bill Q4175. No further clinical judgment is needed.

Medicare pays Q4176 at one flat supply rate in 2026

Medicare Part B covers HCPCS code Q4176 when the claim meets the applicable LCD’s coverage criteria. Coverage isn’t automatic, though. Each MAC publishes its own skin substitute LCD, with its own covered indications, diagnosis codes, and frequency limits.

What the 2026 payment looks like

From January 1, 2026, CMS pays skin substitutes as incident-to supplies under the Physician Fee Schedule (PFS). The CY 2026 final rule set a single initial rate of about $127.28 per square centimeter. CMS pays it separately, on top of the application procedure.

As a result, the unit count now drives the whole product payment. A 12 sq cm application pays roughly $1,527, while an 80 sq cm wound pays about $10,182. Check the figure for your year and locality in the CMS Physician Fee Schedule lookup tool.

Keep the invoice even when it doesn’t set the price

Before 2026, some MACs priced skin substitutes from the supplier invoice. With one national rate in place, the invoice matters less for payment. Even so, follow your MAC’s current guidance and keep the paperwork for audits.

• Keep the product invoice and lot number for every Q4176 application in case of audit.
• PDAC (Pricing, Data Analysis and Coding Contractor) verification may be required for certain skin substitute products under Medicare. Confirm current PDAC status for Neopatch and Therion at the CGS Medicare coding verification resource or your MAC’s equivalent page.
• Medicare Advantage (Part C) plans set their own prior authorization and coverage rules, so don’t assume Part B rules apply.

Prior authorization for Q4176 depends on who’s paying

Traditional Medicare doesn’t require prior authorization (PA) for skin substitutes as a national rule. Individual MACs and Medicare Advantage plans often add their own requirements, though. Confirming eligibility and PA before the first application is the surest way to avoid denials after the fact.

Submit PA requests early, especially to Medicare Advantage plans with multi-day reviews. An application done before a required PA is granted becomes a non-covered service. That denial usually can’t be overturned on medical necessity grounds alone.

Your documentation decides whether a Q4176 claim survives an audit

Complete records are what separate a payable Q4176 claim from a denial in pre- or post-payment review. Use the list below as a before-you-submit checklist. Each item should be in the chart before the claim leaves the practice.

• Wound measurements: Length, width, and depth in centimeters at the time of application, with the measuring tool noted.
• Wound photographs: Dated photos taken before application, showing wound location, dimensions, and wound bed status.
• Progress notes: The wound’s current status, the clinical reason for a skin substitute, and the specific product applied (Neopatch or Therion).
• Treatment history: Evidence that conventional wound care was tried without enough healing progress. Most LCDs require a documented period of standard care first.
• Product information: Manufacturer lot number, product size applied, and expiration date. Keep the product label or packaging record.
• Prescribing clinician credentials: Confirm the ordering provider meets the LCD’s provider eligibility requirements.
• ICD-10 diagnosis code: The documented diagnosis must match a code on the LCD’s covered list.

Skin substitute claims are a frequent target for MAC pre-payment reviews and post-payment audits. Incomplete records count as unsupported claims, even when the product was clinically appropriate.

Six denial triggers to catch before a Q4176 claim goes out

Q4176 denials follow predictable patterns, which means you can prevent many of them. Match each denial to its root cause, then build that check into your workflow. That’s far cheaper than working appeals after the payment is held up.

When a remittance comes back, the Claim Adjustment Reason Code (CARC) names the denial category. Our guide to medical billing denial codes explains each one and the fix it points to.

How claims software keeps Q4176 claims complete before they’re sent

Many wound care teams track Q4176 across a paper measurement sheet, a product invoice, and a separate billing system. Details slip between them, and a claim goes out missing a unit count or an authorization number.

Pabau, the practice management platform we build, keeps those pieces in one patient record. Clinicians capture wound dimensions and product details on digital forms during the visit, so billers aren’t chasing notes.

When the claim is built, Pabau’s wound care claims software pre-fills it from the record. You can search HCPCS and ICD-10 code libraries, and required fields such as authorization numbers are checked before submission. US claims then go out through Claim.MD, with eligibility checks and remittance posting built in.

The outcome is fewer claims bounced for missing fields and less time rebuilding a claim from three sources. Pabau won’t choose your diagnosis code for you. Instead, it makes a skipped step easy to spot.

Send complete Q4176 claims the first time

Pabau pre-fills wound care claims from the patient record and checks required fields before submission. Measurement forms sit beside the claim, so billers aren’t chasing notes.

Book a demo

Conclusion

Q4176 rewards practices that treat wound measurement as a billing step as well as a clinical one. With Medicare paying a flat rate per square centimeter in 2026, each unit on the claim now carries a fixed dollar value.

So build the ruler, the product name, and the covered diagnosis into the visit itself. Then the biller’s job becomes a quick check. Leave those details for someone to piece together later, and each audit turns into an argument you’re unlikely to win.

Book a demo to see how Pabau keeps wound measurements, product details, and Q4176 claims in one record for your practice.

Continue your research

Billing the application alongside the product? CPT code 15271 covers the skin substitute graft code that sits on the same claim as Q4176.

Coding a neighboring skin substitute? HCPCS code Q4150 walks through AlloWrap DS billing, the fee schedule, and ICD-10 pairing.

Want prior authorization sorted before the visit? Insurance eligibility verification explains what to confirm with each payer before treatment starts.

Working a pile of skin substitute denials? Denial management in healthcare sets out a workflow for tracking, appealing, and preventing claim rejections.

Preparing for a MAC audit? Medical billing compliance outlines the documentation standards that protect practices during payer reviews.

Frequently asked questions