No. J0901 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 J0901?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 3 NDCs under J0901, for Vafseo. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J0901?

$0.125 per 1 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 J0901?

One unit of J0901 is 1 mg (for esrd on dialysis), as stated in the code's descriptor. Units to report = dose given ÷ 1 mg (for esrd on dialysis).

J0901 J-Code: Vafseo (vadadustat) — Billing Units & NDCs

In short

J0901 is the HCPCS Level II code for vadadustat, oral, 1 mg (for esrd on dialysis). CMS assigns NDCs for Vafseo to it. One billing unit is 1 mg (for esrd on dialysis). The Medicare Part B payment limit is $0.125 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ0901

Billing unit1 mg (for esrd on dialysis)

Descriptor: Vadadustat, oral, 1 mg (for esrd on dialysis)
Short descriptor: Vadadustat oral 1mg for esrd
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2025

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$0.125

Per1 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 ÷ 1 mg (for esrd on dialysis). For example, 100 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 = 1 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

NDCs billed under J0901

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 3 NDCs to J0901 for Vafseo. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J0901 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Vafseo	59922-0641-60	Akebia Therapeutics Inc	60	9,000
Vafseo	59922-0642-60	Akebia Therapeutics Inc	60	18,000
Vafseo	59922-0643-60	Akebia Therapuetics Inc	60	27,000

J0901: common questions

Is J0901 a CPT code?: No. J0901 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 J0901?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 3 NDCs under J0901, for Vafseo. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J0901?: $0.125 per 1 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 J0901?: One unit of J0901 is 1 mg (for esrd on dialysis), as stated in the code's descriptor. Units to report = dose given ÷ 1 mg (for esrd on dialysis). J-code billing units.

J0901 — Vadadustat, oral, 1 mg (for esrd on dialysis)