No. J9145 is a HCPCS Level II code, maintained by CMS, that identifies the drug supplied. CPT codes are five-digit numbers from the AMA that describe services. Giving the drug, for example an injection or infusion, is usually reported with a separate CPT administration code.

What NDCs are billed under J9145?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9145, for Darzalex. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J9145?

$75.228 per 10 mg, effective October 1, 2026 through December 31, 2026, from CMS's Part B drug payment limit file. Multiply by the units billed for the allowed amount before deductible and coinsurance. It is not a coverage decision.

What is one billing unit of J9145?

One unit of J9145 is 10 mg, as stated in the code's descriptor. Units to report = dose given ÷ 10 mg.

J9145 J-Code: Darzalex (daratumumab) — Billing Units

In short

J9145 is the HCPCS Level II code for injection, daratumumab, 10 mg. CMS assigns NDCs for Darzalex to it. One billing unit is 10 mg. The Medicare Part B payment limit is $75.228 per unit (October 1, 2026 through December 31, 2026).

Code

Med-Code curated

HCPCS codeJ9145

Billing unit10 mg

Descriptor: Injection, daratumumab, 10 mg
Code set: HCPCS Level II, maintained by CMS
Category: Chemotherapy / CD38 Biologic

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$75.228

Per10 mg

Coinsurance19.508%

Effective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. CMS note: Inflation-adjusted coinsurance. A payment limit is not a coverage decision; the Medicare contractor decides coverage. CMS ASP pricing files

Units and claim line

Units = dose given ÷ 10 mg. For example, 1000 mg is 100 units. Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.

Dose given (mg)

HCPCS units (1 unit = 10 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

Drugs mapped to J9145

FDA-listed products billed under J9145

Finished products in the FDA NDC Directory whose brand or single active ingredient, and route, match this code’s entry.

NDC products matching J9145
Product	Strength	Form · route	Labeler	Product NDC
Darzalexdaratumumab	Daratumumab 100 mg/5mL	Injection, Solution, ConcentrateIntravenous	Janssen Biotech, Inc.	57894-502
Darzalex IVdaratumumab	Daratumumab 100 mg/5mL	Injection, Solution, ConcentrateIntravenous	Janssen Biotech, Inc.	57894-505

All NDCs for these drugs

NDCs billed under J9145

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J9145 for Darzalex. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J9145 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Darzalex	57894-0505-05	Janssen Biotech, Inc.	5	10
Darzalex	57894-0505-20	Janssen Biotech, Inc.	20	40

J9145: common questions

Is J9145 a CPT code?: No. J9145 is a HCPCS Level II code, maintained by CMS, that identifies the drug supplied. CPT codes are five-digit numbers from the AMA that describe services. Giving the drug, for example an injection or infusion, is usually reported with a separate CPT administration code. CPT codes for drug administration.
What NDCs are billed under J9145?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9145, for Darzalex. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J9145?: $75.228 per 10 mg, effective October 1, 2026 through December 31, 2026, from CMS's Part B drug payment limit file. Multiply by the units billed for the allowed amount before deductible and coinsurance. It is not a coverage decision.
What is one billing unit of J9145?: One unit of J9145 is 10 mg, as stated in the code's descriptor. Units to report = dose given ÷ 10 mg. J-code billing units.

J9145 — Injection, daratumumab, 10 mg