L3170: Foot, plastic, silicone or equal, heel stabilizer, prefabricated, off-the-shelf, each

Medicare coverage: Special coverage instructions apply

There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.

From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q4-Oct. This states Medicare’s position on the code, not on your particular claim.

Medically Unlikely Edits: units per day

The most units of L3170 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 2026Q4.