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HCPCS L3590 · Level II · orthotic and prosthetic code

L3590: Orthopedic shoe addition, convert firm shoe counter to soft counter, 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 L3590

Medicare payment
$64.07 to $66.36
DMEPOS non-rural state fees
Coverage code
D
special coverage instructions apply
DME supplier MUE
2
MAI 2
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

CMS describes HCPCS L3590, added in 1986, as "Orthopedic shoe addition, convert firm shoe counter to soft counter". DMEPOS fees for L3590, a PO (prosthetics and orthotics) item, run $64.07 in AZ, CA, CT and 17 more to $66.36 in CO, MT, ND and 3 more (floor $58.65, ceiling $78.20) in the October 2026 file. Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 2 (MAI 2, Anatomic Consideration); DME supplier 2 (MAI 2, Anatomic Consideration). 1 active LCD lists L3590: L33641 (Orthopedic Footwear). 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 00; type of service P (lump-sum purchase of DME, prosthetics or orthotics). 10 other active codes open with "Orthopedic shoe addition"; related codes: L3560, L3540, L3500, L3595.

L3590 descriptor and code status

The October 2026 HCPCS Level II file describes L3590 as “Orthopedic shoe addition, convert firm shoe counter to soft counter”. It sits in the L section (orthotic and prosthetic procedures and devices), listed with the other L codes.

HCPCS file attributes of L3590
FieldValue
Short descriptorO shoe convert to sof counte
Added to HCPCS1986-01-01
Last actionN (no maintenance), effective 1999-01-01
Coverage codeD: special coverage instructions apply
Pricing indicator00: not separately priced by Part B
BETOS categoryD1F: prosthetic/orthotic devices
Type of serviceP: lump-sum purchase of DME, prosthetics or orthotics

Medicare payment for L3590

DMEPOS fees for L3590, a PO (prosthetics and orthotics) item, run $64.07 in AZ, CA, CT and 17 more to $66.36 in CO, MT, ND and 3 more (floor $58.65, ceiling $78.20) in the October 2026 file. 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 L3590 by modifier
ModifierFloor / ceilingNon-rural state rangeRural rangeAK / HI / PR / VI
none$58.65 / $78.20$64.07 (AZ, CA, CT…) to $66.36 (CO, MT, ND…)—AK $64.07, HI $64.07, PR $70.44, VI $70.44

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 L3590

Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 2 (MAI 2, Anatomic Consideration); DME supplier 2 (MAI 2, Anatomic Consideration). The DME supplier MUE is a date-of-service policy edit: units above the limit deny even when split across lines, and appeals rarely succeed.

MUE values for L3590 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services03 Date of Service Edit: ClinicalCMS Policy
Facility outpatient hospital22 Date of Service Edit: PolicyAnatomic Consideration
DME supplier22 Date of Service Edit: PolicyAnatomic Consideration

The MUE lookup for L3590 shows every setting next to any other code on the same claim.

NCCI edits and add-on rules

No active practitioner PTP pair lists L3590 in v323r0.

L3590 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 L3590 against a second code to see whether the pair bundles and whether a modifier can separate the services.

Medicare coverage policies for L3590

1 active Local Coverage Determination and 0 billing and coding articles list L3590. 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 L3590

CARC 50 · N115

the diagnosis or documentation does not meet the LCD or billing article that lists L3590

CARC 151 · N362

units of L3590 exceed the DME supplier MUE of 2 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 L3590 claims

QuickAuth coordinates the requirement checks and documentation that DME claims for L3590 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 L3590

What does HCPCS code L3590 describe?

"Orthopedic shoe addition, convert firm shoe counter to soft counter" (short descriptor "O shoe convert to sof counte"), in the L section (orthotic and prosthetic procedures and devices). Added 1986-01-01; last action N (no maintenance) effective 1999-01-01.

Is L3590 a CPT code?

No. L3590 is a CMS HCPCS Level II code; CPT codes are the AMA's five-character set.

What does Medicare pay for L3590?

DMEPOS fees for L3590, a PO (prosthetics and orthotics) item, run $64.07 in AZ, CA, CT and 17 more to $66.36 in CO, MT, ND and 3 more (floor $58.65, ceiling $78.20) in the October 2026 file.

How many units of L3590 can be billed per day?

Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 2 (MAI 2, Anatomic Consideration); DME supplier 2 (MAI 2, Anatomic Consideration). For the DME supplier MUE (MAI 2), units above 2 deny for the whole day as a policy limit; denials arrive as CARC 151.

Does Medicare cover L3590?

Coverage code D (special coverage instructions apply). 1 active LCD lists L3590: L33641 (Orthopedic Footwear).

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.