Q4171 HCPCS code: Interfyl, 1 mg
Q4171 is the HCPCS Level II code for interfyl, 1 mg. In 2022 Medicare paid an average of $30.88 per service for Q4171 across 51,876 services. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. In 2022, about 21 clinicians billed Medicare for Q4171 for 239 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 | 2017-01-01 |
| Last action effective | 2017-01-01 |
Who bills Q4171 (2022)
| Measure | Value |
|---|---|
| Clinicians billing (by place of service) | 21 |
| Medicare beneficiaries | 239 |
| States with claims | 4 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for Q4171, 2022–2022
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 51,876 | 239 | $38.99 | $30.88 |
States with the most Q4171 services (2022)
| State | Services | Avg. paid |
|---|---|---|
| Tennessee | 31,200 | $30.90 |
| Minnesota | 10,401 | $30.80 |
| South Carolina | 5,100 | $31.00 |
| North Carolina | 3,900 | $30.77 |
Medicare policy articles for this code
- A58865: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B))
- A58883: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (Palmetto GBA (MAC - Part A, MAC - Part B))
- A58893: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (Wellpoint Federal (MAC - Part A, MAC - Part B))
- A59374: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (CGS Administrators, LLC (MAC - Part A, MAC - Part B))
- A59434: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (WPS Insurance Corporation (MAC - Part A, MAC - Part B))
- A59434: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (WPS Insurance Corporation (MAC - Part A, MAC - Part B))
- A59764: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B))
- A59766: Billing and Coding: Amniotic and Placental-Derived Product Injections and/or Applications for Musculoskeletal Indications, Non-Wound (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B))
What changed for Q4171
- 2017-01-01: Q4171 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 Q4171?
Q4171 is the HCPCS Level II code for interfyl, 1 mg. Short descriptor: "Interfyl, 1 mg".
How much does Medicare pay for Q4171?
In 2022, the average Medicare payment was $30.88 per service (average allowed $38.99).
Does Medicare cover Q4171?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
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- Q4112 — Cymetra, injectable, 1 cc
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 Q4171
- Watch Q4171 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for Q4171
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.