No. J9312 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 J9312?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9312, for Rituxan. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J9312?

$72.094 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 J9312?

One unit of J9312 is 10 mg, as stated in the code's descriptor. Units to report = dose given ÷ 10 mg.

J9312 J-Code: Rituxan (rituximab) — Billing Units

In short

J9312 is the HCPCS Level II code for injection, rituximab, 10 mg. CMS assigns NDCs for Rituxan to it. One billing unit is 10 mg. The Medicare Part B payment limit is $72.094 per unit (October 1, 2026 through December 31, 2026).

Code

Med-Code curated

HCPCS codeJ9312

Billing unit10 mg

Descriptor: Injection, rituximab, 10 mg
Code set: HCPCS Level II, maintained by CMS
Category: Chemotherapy / CD20 Biologic

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$72.094

Per10 mg

Coinsurance20%

Effective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. 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 J9312

FDA-listed products billed under J9312

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

NDC products matching J9312
Product	Strength	Form · route	Labeler	Product NDC
Truximarituximab-abbs	Rituximab 10 mg/mL	Injection, SolutionIntravenous	Cephalon, Inc.	63459-103
Truximarituximab-abbs	Rituximab 10 mg/mL	Injection, SolutionIntravenous	Cephalon, Inc.	63459-104
Ruxiencerituximab-pvvr	Rituximab 100 mg/10mL	Injection, SolutionIntravenous	Pfizer Laboratories Div Pfizer Inc	0069-0238
Riabnirituximab-arrx	Rituximab 100 mg/10mL	Injection, SolutionIntravenous	Amgen, Inc	55513-224
Riabnirituximab-arrx	Rituximab 500 mg/50mL	Injection, SolutionIntravenous	Amgen, Inc	55513-326
Rituxanrituximab	Rituximab 10 mg/mL	Injection, SolutionIntravenous	Genentech, Inc.	50242-051
Rituxanrituximab	Rituximab 10 mg/mL	Injection, SolutionIntravenous	Genentech, Inc.	50242-053
Ruxiencerituximab-pvvr	Rituximab 500 mg/50mL	Injection, SolutionIntravenous	Pfizer Laboratories Div Pfizer Inc	0069-0249

All NDCs for these drugs

NDCs billed under J9312

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J9312 for Rituxan. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J9312 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Rituxan	50242-0051-21	Genentech, Inc.	10	10
Rituxan	50242-0053-06	Genentech, Inc.	50	50

J9312: common questions

Is J9312 a CPT code?: No. J9312 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 J9312?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9312, for Rituxan. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J9312?: $72.094 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 J9312?: One unit of J9312 is 10 mg, as stated in the code's descriptor. Units to report = dose given ÷ 10 mg. J-code billing units.

J9312 — Injection, rituximab, 10 mg