L5665 HCPCS code: Addition to lower extremity, socket insert, multi-durometer, below knee
L5665 is the HCPCS Level II code for addition to lower extremity, socket insert, multi-durometer, below knee. The 2026 Medicare DMEPOS fee schedule pays $626.84 to $1,049.18 depending on the state. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 2 per day on DME suppliers. Medicare volume rose 10% from 2022 to 2024 (348 to 382 services). In 2024, 132 suppliers billed Medicare for L5665 (purchases), serving 296 beneficiaries; New York, California, Massachusetts accounted for 75% of services. Its average fee ranks 42 of 68 L56 codes (family range $55.23–$7,528.87).
Code details
| Field | Value |
|---|---|
| Section | L codes — Orthotic and prosthetic procedures and devices |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 38 — DMEPOS: orthotics, prosthetics, prosthetic devices and vision services |
| BETOS category | D1F — Prosthetic and orthotic devices |
| Added | 1988-01-01 |
| Last action effective | 1996-01-01 |
2026 Medicare DMEPOS fee schedule for L5665
| Modifier | Meaning | Lowest state fee | Highest state fee | Ceiling | Floor |
|---|---|---|---|---|---|
| — | base fee | $626.84 | $1,049.18 | $835.79 | $626.84 |
| State | Modifier | Fee | Rural fee |
|---|---|---|---|
| AK | — | $981.13 | — |
| AL | — | $626.84 | — |
| AR | — | $669.92 | — |
| AZ | — | $835.79 | — |
| CA | — | $835.79 | — |
| CO | — | $626.84 | — |
| CT | — | $835.79 | — |
| DC | — | $626.84 | — |
| DE | — | $626.84 | — |
| FL | — | $626.84 | — |
| GA | — | $626.84 | — |
| HI | — | $1,049.18 | — |
| IA | — | $826.02 | — |
| ID | — | $626.84 | — |
| IL | — | $712.97 | — |
| IN | — | $712.97 | — |
| KS | — | $826.02 | — |
| KY | — | $626.84 | — |
| LA | — | $669.92 | — |
| MA | — | $835.79 | — |
| MD | — | $626.84 | — |
| ME | — | $835.79 | — |
| MI | — | $712.97 | — |
| MN | — | $712.97 | — |
| MO | — | $826.02 | — |
| MS | — | $626.84 | — |
| MT | — | $626.84 | — |
| NC | — | $626.84 | — |
| ND | — | $626.84 | — |
| NE | — | $826.02 | — |
| NH | — | $835.79 | — |
| NJ | — | $626.84 | — |
| NM | — | $669.92 | — |
| NV | — | $835.79 | — |
| NY | — | $626.84 | — |
| OH | — | $712.97 | — |
| OK | — | $669.92 | — |
| OR | — | $626.84 | — |
| PA | — | $626.84 | — |
| PR | — | $666.22 | — |
| RI | — | $835.79 | — |
| SC | — | $626.84 | — |
| SD | — | $626.84 | — |
| TN | — | $626.84 | — |
| TX | — | $669.92 | — |
| UT | — | $626.84 | — |
| VA | — | $626.84 | — |
| VI | — | $626.84 | — |
| VT | — | $835.79 | — |
| WA | — | $626.84 | — |
| WI | — | $712.97 | — |
| WV | — | $626.84 | — |
| WY | — | $626.84 | — |
How the L5665 fee compares
| Measure | Value |
|---|---|
| Rank among 68 L56 codes (lowest = 1) | 42 |
| Family fee range (average of state fees) | $55.23–$7,528.87 |
| Rural fee uplift | — |
Who bills L5665 (2024)
| Measure | Value |
|---|---|
| Suppliers billing rentals | — |
| Suppliers billing purchases | 132 |
| Referring clinicians | 284 |
| Medicare beneficiaries | 296 |
| States with claims | 6 |
| Share of services in top 3 states (New York, California, Massachusetts) | 75% |
| Year | Suppliers | Beneficiaries |
|---|---|---|
| 2022 | 130 | 290 |
| 2023 | 123 | 303 |
| 2024 | 132 | 296 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for L5665, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 348 | 290 | $632.63 | $489.17 |
| 2023 | 378 | 303 | $680.48 | $520.59 |
| 2024 | 382 | 296 | $694.75 | $536.28 |
States with the most L5665 services (2024)
| State | Services | Avg. paid |
|---|---|---|
| New York | 87 | $464.85 |
| California | 52 | $612.52 |
| Massachusetts | 52 | $624.67 |
| Connecticut | 36 | $623.00 |
| New Jersey | 15 | $466.20 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| DME suppliers | 2 | Anatomic Consideration |
| outpatient hospital claims | 2 | Anatomic Consideration |
What changed for L5665
- 2026-01-01: Average state fee rose 2.0%: $692.71 to $706.57
- 1988-01-01: L5665 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 L5665?
L5665 is the HCPCS Level II code for addition to lower extremity, socket insert, multi-durometer, below knee. Short descriptor: "Multi-durometer below knee".
How much does Medicare pay for L5665?
Under the 2026 DMEPOS fee schedule, non-rural state fees are base (base fee): $626.84–$1,049.18. Rural fees can be higher.
Does Medicare cover L5665?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
Did the Medicare fee for L5665 change in 2026?
The average non-rural state fee moved from $692.71 in 2025 to $706.57 in 2026 (+2.0%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.
How many units of L5665 can be billed per day?
2 on DME suppliers; 2 on outpatient hospital claims (NCCI medically unlikely edits).
Related L56 codes
- L5600 — Preparatory, hip disarticulation-hemipelvectomy, pylon, no cover, sach foot, laminated socket, molded to patient model ($5,443.57–$10,073.55)
- L5610 — Addition to lower extremity, endoskeletal system, above knee, hydracadence system ($2,534.66–$3,807.08)
- L5611 — Addition to lower extremity, endoskeletal system, above knee - knee disarticulation, 4 bar linkage, with friction swing phase control ($1,972.47–$2,747.18)
- L5613 — Addition to lower extremity, endoskeletal system, above knee-knee disarticulation, 4 bar linkage, with hydraulic swing phase control ($2,522.22–$4,561.30)
- L5614 — Addition to lower extremity, exoskeletal system, above knee-knee disarticulation, 4 bar linkage, with pneumatic swing phase control ($2,028.06–$2,230.84)
- L5615 — Addition, endoskeletal knee-shin system, 4 bar linkage or multiaxial, fluid swing and stance phase control ($6,603.89–$9,833.55)
- L5616 — Addition to lower extremity, endoskeletal system, above knee, universal multiplex system, friction swing phase control ($1,427.66–$2,216.96)
- L5617 — Addition to lower extremity, quick change self-aligning unit, above knee or below knee, each ($672.42–$739.74)
- L5618 — Addition to lower extremity, test socket, symes ($319.44–$459.08)
- L5620 — Addition to lower extremity, test socket, below knee ($340.36–$483.98)
- L5622 — Addition to lower extremity, test socket, knee disarticulation ($443.82–$1,237.32)
- L5624 — Addition to lower extremity, test socket, above knee ($445.08–$677.51)
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Next steps
- Run a reimbursement report for a device billed under L5665
- Watch L5665 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for L5665
Sources: CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026; 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.