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HCPCS J3121 · Level II · Part B drug

HCPCS J3121: Injection, testosterone enanthate, 1 mg

Reviewed by QuickIntell RCM Editorial Team · Last reviewed

Data effective
Data currency: ASP payment limits October 2026 (effective October 1, 2026); MUE and NCCI edits 2026 Q4 (effective October 1, 2026); OPPS Addendum B July 2026 (effective July 1, 2026). Next CMS release: January 1, 2027 (ASP, MUE, NCCI and OPPS quarterly updates).

Key facts for J3121

Billing unit
1 MG
Inj testostero enanthate 1mg
ASP payment limit
$0.052
October 2026; -1.9% vs July 2026
Practitioner MUE
400
MAI 3
OPPS status
SI N
NCCI exposure
no PTP pairs
Coverage articles
1
3 states

TL;DR

HCPCS J3121 is the Level II code for Injection, testosterone enanthate, 1 mg, billed per 1 MG. The Medicare Part B ASP payment limit for October 2026 is $0.052 per billing unit, down 1.9% from July 2026. The practitioner MUE allows up to 400 units per date of service (MAI 3). Under OPPS it carries status indicator N. With a 1 mg billing unit, a single administration can be hundreds of units; the unit count on the claim must equal the milligrams given, and rounding rules for partial units follow the contractor's guidance. The ASP crosswalk maps 1 NDC to it, sold as Testosterone Enanthate by Hikma Pharmaceuticals USA Inc.. 1 Medicare coverage article lists the code across 3 states, including .

Medicare Part B payment limit (ASP)

CMS sets the Part B payment limit for J3121 at $0.052 per 1 MG for October 2026, derived from manufacturer average sales price plus 6%, compared with $0.053 in July 2026. Beneficiary coinsurance is 20%.

ASP payment limits for J3121
QuarterPayment limitPerCoinsurance
October 2026$0.0521 MG20%
July 2026$0.0531 MG—
Source: CMS Medicare Part B Drug Payment Limit File. Commercial and Medicaid payers set their own rates.

NDC to HCPCS billing-unit conversion

The October 2026 ASP crosswalk maps 1 NDC from 1 labeler to J3121. Report the NDC in the claim's drug segment and bill the number of J3121 units that equals the quantity administered divided by 1 MG; the last column gives units per full package.

NDCs that crosswalk to J3121
NDCDrug nameLabelerPackage sizeBilling units / package
00143-9750-01Testosterone EnanthateHikma Pharmaceuticals USA Inc.5 × 11000

Medically Unlikely Edits (MUE)

CMS publishes 3 MUE values for J3121. For practitioners the limit is 400 units per date of service with adjudication indicator 3, a date-of-service clinical edit: units above the limit deny but can be paid on appeal with documentation that the quantity was medically reasonable.

MUE values for J3121 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services4003 Date of Service Edit: ClinicalPrescribing Information
Facility outpatient hospital4003 Date of Service Edit: ClinicalPrescribing Information
DME supplier03 Date of Service Edit: ClinicalCMS Policy

NCCI edits and add-on relationships

No active practitioner PTP pair lists J3121 as a column-1 or column-2 code in v323r0. Drug supply codes are rarely bundled; the administration codes billed with them are where PTP edits usually apply.

J3121 is neither an add-on code nor a designated primary code in the 2026 Q4 NCCI add-on edit file.

Medicare coverage articles

1 current Medicare Administrative Contractor article lists J3121 in their HCPCS tables, covering 3 states. Each article carries the covered and non-covered ICD-10 codes that medical-necessity denials (CARC 50) are adjudicated against.

Billing and Coding Articles listing J3121
ArticleTitleContractor(s)StatesRelated LCD
Billing and Coding: Trigger Point InjectionsFirst Coast Service Options, Inc.FL PR VIL33912

Hospital outpatient (OPPS) status

In the July 2026 OPPS Addendum B, J3121 carries status indicator N. Status N means payment is packaged into the associated procedure and no separate OPPS payment is made.

Common denials for J3121 and how to prevent them

CARC 16 · M119

NDC missing, invalid or not matched to the HCPCS code

CARC 151 · N362

units billed exceed the MUE for the date of service

CARC 50 · N115

diagnosis not covered by the applicable coverage article or LCD

How QuickIntell checks J3121 before the claim leaves

QuickCode validates the NDC-to-unit conversion against the current ASP crosswalk, checks units against every published MUE setting and flags PTP and add-on conflicts on the same claim. QuickRCM routes CARC 16, 151 and 50 denials on drug lines with the matching coverage article attached so the appeal starts with evidence.

Explore QuickCodeExplore QuickRCMBook a demo

Frequently asked questions — HCPCS J3121

What does HCPCS code J3121 describe?

J3121 is defined by CMS as "Injection, testosterone enanthate, 1 mg". Each billing unit represents 1 MG, so the units reported on the claim must equal the dose administered divided by that unit.

What is the Medicare reimbursement for J3121 in October 2026?

The ASP-based payment limit is $0.052 per 1 MG, with 20% beneficiary coinsurance. Medicare Administrative Contractors apply this limit; commercial payers use their own fee schedules. The July 2026 limit was $0.053.

How many units of J3121 can be billed per day?

The practitioner Medically Unlikely Edit is 400 units per date of service with adjudication indicator 3 (3 Date of Service Edit: Clinical). MAI 3 edits can be appealed with documentation that the units were medically reasonable. CMS cites "Prescribing Information" as the rationale.

Which NDCs map to J3121?

The October 2026 ASP crosswalk lists 1 NDC from 1 labeler: Testosterone Enanthate (Hikma Pharmaceuticals USA Inc.). For example NDC 00143-9750-01 is a 5 package equal to 1000 billing units. The crosswalk's billing-units-per-package figure converts each package into J3121 units.

Does J3121 have NCCI bundling edits?

No active practitioner PTP pairs list J3121 as a column-1 or column-2 code in the v323r0 release. Unit limits (MUE) and medical-necessity coverage rules still apply.

Which Medicare coverage articles mention J3121?

1 current Billing and Coding Article in the Medicare Coverage Database list J3121, covering 3 states: (Billing and Coding: Trigger Point Injections).

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-01. Verify against the primary file before billing or contracting decisions.

Disclaimer

This page is an operational reference compiled from CMS publications: the Medicare Part B drug payment limit and NDC crosswalk files, NCCI MUE and add-on edit tables, aggregate PTP statistics, OPPS Addendum B and the Medicare Coverage Database. Payment limits are Medicare national amounts; commercial and Medicaid payers differ. CPT codes are shown as numbers only; CPT descriptors are copyright AMA. Nothing here is legal, clinical or billing advice.