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HCPCS A4558 · Level II · A code

A4558: Conductive gel or paste, for use with electrical device (e.g., TENS, nmes), per oz, HCPCS Level II A 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); PFS relative value file: RVU26D, released August 26, 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). 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; RVU27A with the CY2027 PFS final rule, effective January 1, 2027 for the PFS relative value file.

Key facts for A4558

Medicare payment
$6.60 to $7.77
DMEPOS non-rural state fees
Coverage code
C
carrier judgment, so the Medicare contractor decides coverage
DME supplier MUE
0
MAI 3
OPPS status
SI N
Items and Services packaged into APC rates
NCCI PTP pairs
0
practitioner file
LCDs and articles
0 / 0

TL;DR

CMS describes HCPCS A4558, added in 1985, as "Conductive gel or paste, for use with electrical device (e.g., tens, nmes), per oz". DMEPOS fees for A4558, a SU (supplies) item, run $6.60 in DC, DE, IL and 16 more to $7.77 in AL, AR, AZ and 22 more (floor $6.60, ceiling $7.77) in the October 2026 file. Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: Data); DME supplier 0 (MAI 3, Published Contractor Policy). A4558 appears in no active LCD or billing and coding article, so coverage follows HCPCS coverage code C (carrier judgment, so the Medicare contractor decides coverage) and any NCD. OPPS status indicator N: Items and Services packaged into APC rates. HCPCS record: BETOS D1E (other DME); pricing indicator 34; type of service P (lump-sum purchase of DME, prosthetics or orthotics). Nearby codes: A4557, A4556, A4562, A4565.

A4558 descriptor and code status

The October 2026 HCPCS Level II file describes A4558 as “Conductive gel or paste, for use with electrical device (e.g., tens, nmes), per oz”. It sits in the A section (transportation, medical and surgical supplies, administrative, miscellaneous and investigational), listed with the other A codes. Although searches often call it the "A4558 CPT code", A4558 is a HCPCS Level II code maintained by CMS, not an AMA CPT code; both go in the same procedure-code field on the claim.

HCPCS file attributes of A4558
FieldValue
Short descriptorConductive gel or paste
Added to HCPCS1985-01-01
Last actionN (no maintenance), effective 2007-01-01
Coverage codeC: carrier judgment, so the Medicare contractor decides coverage
Pricing indicator34: DMEPOS DME supplies (floors and ceilings)
BETOS categoryD1E: other DME
Type of serviceP: lump-sum purchase of DME, prosthetics or orthotics

Medicare payment for A4558

DMEPOS fees for A4558, a SU (supplies) item, run $6.60 in DC, DE, IL and 16 more to $7.77 in AL, AR, AZ and 22 more (floor $6.60, ceiling $7.77) 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.

Physician fee schedule (RVU26D)

Status P: bundled or excluded: no separate physician fee schedule payment. Global period XXX (global surgery concept does not apply); PC/TC indicator 9 (professional/technical concept does not apply).

DMEPOS fee schedule (DME26-D)

Jurisdiction D (DME MAC), payment category SU (supplies). 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 A4558 by modifier
ModifierFloor / ceilingNon-rural state rangeRural rangeAK / HI / PR / VI
none$6.60 / $7.77$6.60 (DC, DE, IL…) to $7.77 (AL, AR, AZ…)—AK $9.47, HI $10.09, PR $2.77, VI $6.60

Hospital outpatient (OPPS Addendum B)

Status indicator N (Items and Services packaged into APC rates), with no separate OPPS payment rate.

Medically Unlikely Edits for A4558

Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: Data); DME supplier 0 (MAI 3, Published Contractor Policy). 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 A4558 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services03 Date of Service Edit: ClinicalCMS Policy
Facility outpatient hospital13 Date of Service Edit: ClinicalClinical: Data
DME supplier03 Date of Service Edit: ClinicalPublished Contractor Policy

The MUE lookup for A4558 shows every setting next to any other code on the same claim.

NCCI edits and add-on rules

No active practitioner PTP pair lists A4558 in v323r0.

A4558 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 A4558 against a second code to see whether the pair bundles and whether a modifier can separate the services.

Medicare coverage policies for A4558

No current LCD or billing and coding article lists A4558. The HCPCS coverage code C means carrier judgment, so the Medicare contractor decides coverage, and any National Coverage Determination for the service still applies.

Denials to expect on A4558

CARC 50 · N115

the service is not reasonable and necessary for the diagnosis on the claim

CARC 151 · N362

units of A4558 exceed the DME supplier MUE of 0 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 A4558 claims

QuickAuth coordinates the requirement checks and documentation that DME claims for A4558 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 A4558

What does HCPCS code A4558 describe?

"Conductive gel or paste, for use with electrical device (e.g., tens, nmes), per oz" (short descriptor "Conductive gel or paste"), in the A section (transportation, medical and surgical supplies, administrative, miscellaneous and investigational). Added 1985-01-01; last action N (no maintenance) effective 2007-01-01.

Is A4558 a CPT code?

No. A4558 is a CMS HCPCS Level II code; CPT codes are the AMA's five-character set. Searches for "A4558 CPT code" mean this Level II code.

What does Medicare pay for A4558?

DMEPOS fees for A4558, a SU (supplies) item, run $6.60 in DC, DE, IL and 16 more to $7.77 in AL, AR, AZ and 22 more (floor $6.60, ceiling $7.77) in the October 2026 file.

How many units of A4558 can be billed per day?

Its 2026 Q4 MUEs per date of service: practitioner 0 (MAI 3, CMS Policy); hospital outpatient 1 (MAI 3, Clinical: Data); DME supplier 0 (MAI 3, Published Contractor Policy). For the DME supplier MUE (MAI 3), units above 0 deny for the day but can be paid on appeal with documentation; denials arrive as CARC 151.

Does Medicare cover A4558?

A4558 appears in no active LCD or billing and coding article, so coverage follows HCPCS coverage code C (carrier judgment, so the Medicare contractor decides coverage) and any NCD.

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.