No. J9184 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 J9184?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9184, for Avgesmi. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J9184?

$403.465 per 200 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 J9184?

One unit of J9184 is 200 mg, as stated in the code's descriptor. Units to report = dose given ÷ 200 mg.

J9184 J-Code: Avgesmi (gemcitabine hydrochloride)

In short

J9184 is the HCPCS Level II code for injection, gemcitabine hydrochloride (avyxa), 200 mg. CMS assigns NDCs for Avgesmi to it. One billing unit is 200 mg. The Medicare Part B payment limit is $403.465 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ9184

Billing unit200 mg

Descriptor: Injection, gemcitabine hydrochloride (avyxa), 200 mg
Short descriptor: Inj gemcitabin (avyxa) 200mg
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2026

The billing unit is read from the descriptor. Confirm it against the CMS file before billing.

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$403.465

Per200 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 ÷ 200 mg. For example, 20000 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 = 200 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

NDCs billed under J9184

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J9184 for Avgesmi. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J9184 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Avgesmi	83831-0123-01	Avyxa Pharma, LLC	26.3	5
Avgesmi	83831-0124-01	Avyxa Pharma, LLC	52.6	10

J9184: common questions

Is J9184 a CPT code?: No. J9184 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 J9184?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J9184, for Avgesmi. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J9184?: $403.465 per 200 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 J9184?: One unit of J9184 is 200 mg, as stated in the code's descriptor. Units to report = dose given ÷ 200 mg. J-code billing units.

J9184 — Injection, gemcitabine hydrochloride (avyxa), 200 mg