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HCPCS J9318 · Level II · Part B drug

HCPCS J9318: Injection, romidepsin, non-lyophilized, 0.1 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 J9318

Billing unit
0.1 MG
Inj romidepsin non-lyo 0.1mg
ASP payment limit
$32.864
October 2026
Practitioner MUE
475
MAI 3
OPPS status
SI K
APC 9428
NCCI exposure
no PTP pairs
Coverage articles
0
none list this code

TL;DR

HCPCS J9318 is the Level II code for Injection, romidepsin, non-lyophilized, 0.1 mg, billed per 0.1 MG. The Medicare Part B ASP payment limit for October 2026 is $32.864 per billing unit. The practitioner MUE allows up to 475 units per date of service (MAI 3). Under OPPS it carries status indicator K in APC 9428. 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 Romidepsin by Amneal Pharmaceuticals, LLC. No current Billing and Coding Article lists J9318, so coverage follows the FDA label, compendia and any applicable NCD.

Medicare Part B payment limit (ASP)

CMS sets the Part B payment limit for J9318 at $32.864 per 0.1 MG for October 2026, derived from manufacturer average sales price plus 6%. Beneficiary coinsurance is 20%.

ASP payment limits for J9318
QuarterPayment limitPerCoinsurance
October 2026$32.8640.1 MG20%
July 2026n/a0.1 MG—
CMS note: Added October 2026

NDC to HCPCS billing-unit conversion

The October 2026 ASP crosswalk maps 1 NDC from 1 labeler to J9318. Report the NDC in the claim's drug segment and bill the number of J9318 units that equals the quantity administered divided by 0.1 MG; the last column gives units per full package.

NDCs that crosswalk to J9318
NDCDrug nameLabelerPackage sizeBilling units / package
70121-2250-01RomidepsinAmneal Pharmaceuticals, LLC5.5 × 1275

Medically Unlikely Edits (MUE)

CMS publishes 2 MUE values for J9318. For practitioners the limit is 475 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 J9318 by setting
SettingMUE (units/DOS)MAICMS rationale
Practitioner services4753 Date of Service Edit: ClinicalCMS Policy
Facility outpatient hospital4753 Date of Service Edit: ClinicalCMS Policy

NCCI edits and add-on relationships

No active practitioner PTP pair lists J9318 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.

J9318 is neither an add-on code nor a designated primary code in the 2026 Q4 NCCI add-on edit file.

Medicare coverage articles

No current Billing and Coding Article lists J9318 in its HCPCS table. Coverage then follows the drug's FDA label, compendia and any National Coverage Determination; check the Medicare Coverage Database before administering off-label.

Hospital outpatient (OPPS) status

In the July 2026 OPPS Addendum B, J9318 carries status indicator K and is assigned to APC 9428, with a published national unadjusted payment of $33.59. Status K means the drug is paid separately under OPPS at the ASP-based rate rather than packaged into the procedure.

Common denials for J9318 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 J9318 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.

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Frequently asked questions — HCPCS J9318

What does HCPCS code J9318 describe?

J9318 is defined by CMS as "Injection, romidepsin, non-lyophilized, 0.1 mg". Each billing unit represents 0.1 MG, so the units reported on the claim must equal the dose administered divided by that unit.

What is the Medicare reimbursement for J9318 in October 2026?

The ASP-based payment limit is $32.864 per 0.1 MG, with 20% beneficiary coinsurance. Medicare Administrative Contractors apply this limit; commercial payers use their own fee schedules.

How many units of J9318 can be billed per day?

The practitioner Medically Unlikely Edit is 475 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 "CMS Policy" as the rationale.

Which NDCs map to J9318?

The October 2026 ASP crosswalk lists 1 NDC from 1 labeler: Romidepsin (Amneal Pharmaceuticals, LLC). For example NDC 70121-2250-01 is a 5.5 package equal to 275 billing units. The crosswalk's billing-units-per-package figure converts each package into J9318 units.

Does J9318 have NCCI bundling edits?

No active practitioner PTP pairs list J9318 as a column-1 or column-2 code in the v323r0 release. Unit limits (MUE) and medical-necessity coverage rules still apply.

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.