Q4128 HCPCS code: Flex hd, or allopatch hd, per square centimeter
Q4128 is the HCPCS Level II code for flex hd, or allopatch hd, per square centimeter. In 2023 Medicare paid an average of $24.23 per service for Q4128 across 235 services. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. In 2023, about 2 clinicians billed Medicare for Q4128 for 20 beneficiaries.
Code details
| Field | Value |
|---|---|
| Section | Q codes — Temporary codes |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 51 — Drug or biological (priced per ASP/average sales price rules) |
| BETOS category | O1E — Other drugs |
| Added | 2012-01-01 |
| Last action effective | 2022-10-01 |
Who bills Q4128 (2023)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 2 |
| Medicare beneficiaries | 20 |
| States with claims | 1 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for Q4128, 2023–2023
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2023 | 235 | 20 | $30.43 | $24.23 |
States with the most Q4128 services (2023)
| State | Services | Avg. paid |
|---|---|---|
| Connecticut | 226 | $24.24 |
What changed for Q4128
- 2012-01-01: Q4128 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code Q4128?
Q4128 is the HCPCS Level II code for flex hd, or allopatch hd, per square centimeter. Short descriptor: "Flexhd/allopatchhd/sq cm".
How much does Medicare pay for Q4128?
In 2023, the average Medicare payment was $24.23 per service (average allowed $30.43).
Does Medicare cover Q4128?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
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Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under Q4128
- Watch Q4128 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for Q4128
Sources: CMS HCPCS Level II release October 2025; CMS DMEPOS fee schedule; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.