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HCPCS L8420 · Level II · orthotic and prosthetic code

L8420: Prosthetic sock, multiple ply, below knee, each, HCPCS Level II orthotic and prosthetic code

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: HCPCS Level II file: October 2026 (effective October 1, 2026); DMEPOS fee schedule: DME26-D (October 2026) (effective October 1, 2026); NCCI MUE tables: 2026 Q4 (effective October 1, 2026); NCCI PTP edits: v323r0 (2026 Q4) (effective October 1, 2026); OPPS Addendum B: October 2026 (effective October 1, 2026); Medicare Coverage Database LCD export: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: January 1, 2027 (quarterly update) for the HCPCS Level II file and DMEPOS fee schedule and NCCI MUE tables and NCCI PTP edits and OPPS Addendum B; weekly, every Thursday for the Medicare Coverage Database LCD export.

Key facts for L8420

Medicare payment
$23.81 to $31.74
DMEPOS non-rural state fees
Coverage code
D
special coverage instructions apply
DME supplier MUE
24
MAI 3
OPPS status
SI A
Services not paid under OPPS; paid under fee schedule or other payment system
NCCI PTP pairs
0
practitioner file
LCDs and articles
1 / 0

TL;DR

HCPCS Level II L8420 reads "Prosthetic sock, multiple ply, below knee, each" in the October 2026 file; it dates from 1982. The October 2026 DMEPOS fee schedule (category PO, prosthetics and orthotics) sets L8420 at $23.81 in CO, MT, ND and 3 more to $31.74 in AZ, CA, NV (floor $23.81, ceiling $31.74). CMS caps L8420 at practitioner 0 (MAI 3, CMS Policy); hospital outpatient 14 (MAI 3, Clinical: Data); DME supplier 24 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. 1 active LCD lists L8420: L33787 (Lower Limb Prostheses). OPPS status indicator A: Services not paid under OPPS; paid under fee schedule or other payment system. HCPCS record: BETOS D1F (prosthetic/orthotic devices); pricing indicator 38; type of service P (lump-sum purchase of DME, prosthetics or orthotics). 5 other active codes open with "Prosthetic sock"; related codes: L8430, L8470, L8435, L8480.

L8420 descriptor and code status

The October 2026 HCPCS Level II file describes L8420 as “Prosthetic sock, multiple ply, below knee, each”. It sits in the L section (orthotic and prosthetic procedures and devices), listed with the other L codes.

HCPCS file attributes of L8420
FieldValue
Short descriptorProsthetic sock multi ply bk
Added to HCPCS1982-01-01
Last actionN (no maintenance), effective 1999-01-01
Coverage codeD: special coverage instructions apply
Pricing indicator38: DMEPOS orthotics, prosthetics, prosthetic devices and vision services (floors and ceilings)
BETOS categoryD1F: prosthetic/orthotic devices
Type of serviceP: lump-sum purchase of DME, prosthetics or orthotics

Medicare payment for L8420

The October 2026 DMEPOS fee schedule (category PO, prosthetics and orthotics) sets L8420 at $23.81 in CO, MT, ND and 3 more to $31.74 in AZ, CA, NV (floor $23.81, ceiling $31.74). The amounts below are national figures from the October 2026 CMS files; the contractor applies the locality, rural or state adjustment and the beneficiary's cost sharing.

DMEPOS fee schedule (DME26-D)

Jurisdiction D (DME MAC), payment category PO (prosthetics and orthotics). Fees are set per state; AK, HI, PR and VI are not subject to the national ceiling and floor and are listed separately. A rural fee applies only in ZIP codes on the CMS rural ZIP list.

DMEPOS fees for L8420 by modifier
ModifierFloor / ceilingNon-rural state rangeRural rangeAK / HI / PR / VI
none$23.81 / $31.74$23.81 (CO, MT, ND…) to $31.74 (AZ, CA, NV)—AK $32.94, HI $35.23, PR $47.61, VI $27.60

Hospital outpatient (OPPS Addendum B)

Status indicator A (Services not paid under OPPS; paid under fee schedule or other payment system), with no separate OPPS payment rate.

Medically Unlikely Edits for L8420

CMS caps L8420 at practitioner 0 (MAI 3, CMS Policy); hospital outpatient 14 (MAI 3, Clinical: Data); DME supplier 24 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. The DME supplier MUE is a date-of-service clinical edit: units above the limit deny but can be paid on appeal with documentation.

MUE values for L8420 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services03 Date of Service Edit: ClinicalCMS Policy
Facility outpatient hospital143 Date of Service Edit: ClinicalClinical: Data
DME supplier243 Date of Service Edit: ClinicalClinical: Data

The MUE lookup for L8420 shows every setting next to any other code on the same claim.

NCCI edits and add-on rules

No active practitioner PTP pair lists L8420 in v323r0.

L8420 is neither an add-on code nor a designated primary code in the 2026 Q4 NCCI add-on edit file.

Pair counts show exposure, not the answer for one claim. Check L8420 against a second code to see whether the pair bundles and whether a modifier can separate the services.

Medicare coverage policies for L8420

1 active Local Coverage Determination and 0 billing and coding articles list L8420. Each applies only in its contractor's jurisdiction, and the article carries the diagnosis codes that support the item or service.

Denials to expect on L8420

CARC 50 · N115

the diagnosis or documentation does not meet the LCD or billing article that lists L8420

CARC 151 · N362

units of L8420 exceed the DME supplier MUE of 24 per date of service

CARC 4

the modifier reported is inconsistent with the code

CARC 16

the claim lacks information needed to adjudicate the line, such as an order, NPI or required modifier

Where QuickIntell fits for L8420 claims

QuickAuth coordinates the requirement checks and documentation that DME claims for L8420 depend on, with human review of each case, and QuickRCM carries claim readiness and the CARC 50, 151 and modifier denials these items draw.

See QuickAuth for requirement checksSee QuickRCM for denial follow-upBook a meeting

Frequently asked questions: HCPCS L8420

What does HCPCS code L8420 describe?

"Prosthetic sock, multiple ply, below knee, each" (short descriptor "Prosthetic sock multi ply bk"), in the L section (orthotic and prosthetic procedures and devices). Added 1982-01-01; last action N (no maintenance) effective 1999-01-01.

Is L8420 a CPT code?

It is not. L8420 belongs to the L section (orthotic and prosthetic procedures and devices) of HCPCS Level II, the CMS code set, not to AMA CPT.

What does Medicare pay for L8420?

The October 2026 DMEPOS fee schedule (category PO, prosthetics and orthotics) sets L8420 at $23.81 in CO, MT, ND and 3 more to $31.74 in AZ, CA, NV (floor $23.81, ceiling $31.74).

How many units of L8420 can be billed per day?

CMS caps L8420 at practitioner 0 (MAI 3, CMS Policy); hospital outpatient 14 (MAI 3, Clinical: Data); DME supplier 24 (MAI 3, Clinical: Data) units per day in the 2026 Q4 MUE tables. For the DME supplier MUE (MAI 3), units above 24 deny for the day but can be paid on appeal with documentation; denials arrive as CARC 151.

Does Medicare cover L8420?

Coverage code D (special coverage instructions apply). 1 active LCD lists L8420: L33787 (Lower Limb Prostheses).

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

This page is an operational reference compiled from CMS publications: the HCPCS Level II file, the physician, DMEPOS and clinical laboratory fee schedules, OPPS and ASC addenda, NCCI MUE, PTP and add-on edit tables and the Medicare Coverage Database. Amounts are Medicare national figures before locality and state adjustment; Medicaid and commercial payers set their own. CPT codes are shown as numbers only; CPT descriptors are copyright AMA. Nothing here is legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.