Written and maintained by CASRAI Editorial Board
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This page describes products and general use; it is not medical advice.
A CAM boot (controlled ankle motion walker, also called a walking boot) is billed to Medicare under one of four HCPCS codes: L4360, L4361, L4386 or L4387. Which one applies depends on two things the code descriptors spell out: whether the boot is pneumatic and/or vacuum or non-pneumatic, and whether it is an off-the-shelf item or a prefabricated item customized to fit a specific patient by an individual with expertise. This guide is for clinic staff, billers and buyers who need to match a boot to its code. For how the boot is built, see how a walking boot works and what a CAM boot is; for fit, see walking boot sizes.
Which HCPCS code applies to a CAM boot or walking boot?
The Medicare Coverage Database policy article for ankle-foot and knee-ankle-foot orthoses (A52457) states that prefabricated walking boots are coded using L4360, L4361, L4386 or L4387, and that these codes describe complete products. The same four codes answer the searches “hcpcs code for cam boot”, “hcpcs code for walking boot” and “walking boot hcpcs code”: HCPCS has no separate CAM boot code. The four codes form a two-by-two grid built from the published descriptors.
| Code | Pneumatic and/or vacuum, or non-pneumatic | Off-the-shelf, or customized to a specific patient |
|---|---|---|
| L4360 | Pneumatic and/or vacuum | Prefabricated item trimmed, bent, molded, assembled or otherwise customized to fit a specific patient by an individual with expertise |
| L4361 | Pneumatic and/or vacuum | Prefabricated, off-the-shelf |
| L4386 | Non-pneumatic | Prefabricated item trimmed, bent, molded, assembled or otherwise customized to fit a specific patient by an individual with expertise |
| L4387 | Non-pneumatic | Prefabricated, off-the-shelf |
Every descriptor reads “Walking boot … with or without joints, with or without interface material, prefabricated”. The descriptor wording comes from the AAPC code pages for L4360, L4361, L4386 and L4387 (checked 2026-11-01). Policy article A52457 lists L4360 and L4386 among the codes coded as custom fitted, and L4361 and L4387 as their off-the-shelf pairs (checked 2026-11-01).
What does the HCPCS code L4386 represent?
L4386 is a non-pneumatic walking boot, with or without joints and with or without interface material, that is a prefabricated item trimmed, bent, molded, assembled or otherwise customized to fit a specific patient by an individual with expertise. Its off-the-shelf sibling is L4387. In A52457, the line between the two is the extent of fitting work: items requiring minimal self-adjustment are coded as off-the-shelf orthoses, while items requiring more than minimal self-adjustment by a qualified practitioner are coded as custom fitted, which includes L4360 and L4386.
What is the difference between pneumatic and non-pneumatic walking boots?
In coding terms, the difference is in the descriptor. L4360 and L4361 are for “pneumatic and/or vacuum” walking boots; L4386 and L4387 are for “non-pneumatic” walking boots. The descriptors do not define the terms further, so compare the manufacturer’s own product description with the descriptor wording. The walking boot mechanics guide describes the air liner and rocker sole.
Is a CAM boot a fracture boot?
HCPCS does not code by diagnosis. The four walking boot codes describe a product (an ankle-foot orthosis in the Medicare policy article), not a condition such as a fracture. Whether a particular person should wear a boot, and for what, is a clinician’s decision. The A52457 article does state that walking boots used as a brace for an orthopedic condition are coded L4360, L4361, L4386, L4387 or L4631, which is the context in which the codes apply. The code set says nothing about treating any injury.
When a different code applies
- Ulcer or pressure reduction only. A52457 says walking boots must be coded A9283 (foot pressure off-loading/supportive device, any type, each) when used solely for the prevention or treatment of a lower extremity ulcer or pressure reduction.
- Add-on codes. Claims for add-on codes used with walking boots coded L4360, L4361, L4386 or L4387 are denied, because the four codes describe complete products.
- L4631. A52457 lists L4631 together with the four prefabricated walking boot codes for use as a brace for an orthopedic condition; confirm its descriptor in the current HCPCS file before using it.
- Surgical and post-op shoes. These are a different product class; see surgical shoe types, features and sizes.
What to verify before ordering or billing
- The code printed on the supplier’s label or catalogue entry for that exact model, and its descriptor wording (pneumatic and/or vacuum or non-pneumatic).
- Whether the boot is delivered off-the-shelf or fitted by someone with expertise at delivery, since that decides between the L4361/L4387 pair and the L4360/L4386 pair.
- The current payer policy. HCPCS is maintained by CMS and Medicare policy articles are revised, so rely on the current policy article (A52457, checked 2026-11-01) and your payer’s own policy.
- Whether the use is orthopedic or solely ulcer or pressure related, since that moves the claim between the L-codes and A9283.
Common mistakes
- Searching for a CAM boot code by brand name. The code follows the descriptor, not the brand.
- Billing add-on codes with a walking boot code.
- Treating “pneumatic” as marketing language rather than the descriptor term.
FAQ
Is a CAM boot a fracture boot?
The HCPCS codes describe the product, not a diagnosis. Use by a given person is a clinician’s decision.
What does the HCPCS code L4386 represent?
A non-pneumatic, prefabricated walking boot customized to fit a specific patient by an individual with expertise. The off-the-shelf version is L4387.
What is the difference between pneumatic and non-pneumatic walking boots?
L4360 and L4361 are written for pneumatic and/or vacuum walking boots; L4386 and L4387 for non-pneumatic ones. Compare ankle brace types for related product classes.
Sources
- CMS Medicare Coverage Database, Ankle-Foot/Knee-Ankle-Foot Orthoses – Policy Article A52457, https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=52457 (checked 2026-11-01).
- AAPC Codify, HCPCS code pages L4360, L4361, L4386, L4387, https://www.aapc.com/codes/hcpcs-codes/L4386 (descriptor text; checked 2026-11-01).
- Noridian Healthcare Solutions, Ankle Foot Orthoses – Walking Boots Coverage and Coding Issues (archived, last updated December 11, 2023; background only), https://med.noridianmedicare.com/web/jddme/policies/dmd-articles/ankle-foot-orthoses-walking-boots-coverage-and-coding-issues-revised (checked 2026-11-01).
