L5637 — Addition to lower extremity, below knee, total contact
L5637 is a HCPCS Level II code for addition to lower extremity, below knee, total contact. It belongs to the Orthotic and Prosthetic Procedures and Devices section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Medically Unlikely Edits — units per day
The most units of L5637 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · CMS Policy
- outpatient
- 2 units MAI 2 — Date of Service Edit: Policy · Anatomic Consideration
- DME supplier
- 2 units MAI 2 — Date of Service Edit: Policy · Anatomic Consideration
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for L5637
- Long descriptor
- Addition to lower extremity, below knee, total contact
- Short descriptor
- Below knee total contact
- Added
- January 1, 1989
- BETOS
- D1F
- Pricing indicator
- 38 — DMEPOS
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Orthotics, prosthetics, prosthetic devices and vision services. Price subject to floors and ceilings.
Codes adjacent to L5637
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If L5637 is not quite right, the correct code is very often within a few positions of it.
- L5626Addition to lower extremity, test socket, hip disarticulation
- L5628Addition to lower extremity, test socket, hemipelvectomy
- L5629Addition to lower extremity, below knee, acrylic socket
- L5630Addition to lower extremity, symes type, expandable wall socket
- L5631Addition to lower extremity, above knee or knee disarticulation, acrylic socket
- L5632Addition to lower extremity, symes type, 'ptb' brim design socket
- L5634Addition to lower extremity, symes type, posterior opening (canadian) socket
- L5636Addition to lower extremity, symes type, medial opening socket
- L5638Addition to lower extremity, below knee, leather socket
- L5639Addition to lower extremity, below knee, wood socket
- L5640Addition to lower extremity, knee disarticulation, leather socket
- L5642Addition to lower extremity, above knee, leather socket
- L5643Addition to lower extremity, hip disarticulation, flexible inner socket, external frame
- L5644Addition to lower extremity, above knee, wood socket
- L5645Addition to lower extremity, below knee, flexible inner socket, external frame
- L5646Addition to lower extremity, below knee, air, fluid, gel or equal, cushion socket
Questions about L5637
What is HCPCS code L5637?
L5637 is a HCPCS Level II code for addition to lower extremity, below knee, total contact. It sits in the Orthotic and Prosthetic Procedures and Devices section.
Does Medicare cover L5637?
The CMS HCPCS file marks L5637 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.