No. J3475 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 is the Medicare payment limit for J3475?

$0.436 per 500 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 J3475?

One unit of J3475 is 500 mg, as stated in the code's descriptor. Units to report = dose given ÷ 500 mg.

J3475 J-Code: Magnesium sulfate — Billing Units & NDCs

In short

J3475 is the HCPCS Level II code for injection, magnesium sulfate, per 500 mg. CMS assigns NDCs for Magnesium Sulfate, Magnesium Sulfate in 5% Dextrose and Magnesium Sulfate-Dextrose to it. One billing unit is 500 mg. The Medicare Part B payment limit is $0.436 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ3475

Billing unit500 mg

Descriptor: Injection, magnesium sulfate, per 500 mg
Short descriptor: Inj magnesium sulfate
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 1997

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$0.436

Per500 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 ÷ 500 mg. For example, 50000 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 = 500 mg)

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the dose given to build the claim line.

NDCs billed under J3475

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 60 NDCs to J3475 for Magnesium Sulfate, Magnesium Sulfate in 5% Dextrose and Magnesium Sulfate-Dextrose. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J3475 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Magnesium Sulfate	00264-4204-52	B. Braun Medical Inc.	24 × 50	96
Magnesium Sulfate	00264-4205-52	B. Braun Medical Inc.	24 × 50	192
Magnesium Sulfate	00264-4206-54	B. Braun Medical Inc.	24 × 100	192
Magnesium Sulfate	00338-1708-40	Baxter Healthcare Corporation	40 × 50	160
Magnesium Sulfate	00338-1715-40	Baxter Healthcare Corporation	40 × 100	320
Magnesium Sulfate	00338-1719-40	Baxter Healthcare Corporation	40 × 50	320
Magnesium Sulfate	00338-6353-40	Baxter Healthcare Corporation	40 × 100	240
Magnesium Sulfate	00404-9902-20	Henry Schein Inc.	20	20
Magnesium Sulfate	00404-9903-10	Henry Schein Inc.	10	10
Magnesium Sulfate	00404-9904-02	Henry Schein Inc.	2	2
Magnesium Sulfate	00409-1754-10	Pfizer Inc	10 × 10	100
Magnesium Sulfate	00409-2050-20	Pfizer Inc	20 × 500	800
Magnesium Sulfate	00409-2168-77	Pfizer Inc	25 × 20	500
Magnesium Sulfate	00409-3164-12	Pfizer Inc	12 × 1,000	960
Magnesium Sulfate	00409-6729-23	Pfizer Inc	24 × 100	192
Magnesium Sulfate	00409-6729-24	Pfizer Inc	24 × 50	96
Magnesium Sulfate	25021-0612-81	Sagent Pharmaceuticals	10 × 50	40
Magnesium Sulfate	25021-0612-82	Sagent Pharmaceuticals	10 × 100	80
Magnesium Sulfate	44567-0420-24	WG Critical Care, LLC	24 × 50	96
Magnesium Sulfate	44567-0421-24	WG Critical Care, LLC	24 × 100	192
Magnesium Sulfate	44567-0424-24	WG Critical Care, LLC	24 × 50	192
Magnesium Sulfate	47335-0992-01	Sun Pharmaceutical Global FZE.	24 × 50	96
Magnesium Sulfate	47335-0992-02	Sun Pharmaceutical Global FZE.	24 × 100	192
Magnesium Sulfate	51662-1235-01	HF Acquisition Co. LLC, DBA HealthFirst	10	10
Magnesium Sulfate	51662-1235-03	HF Acquisition Co. LLC, DBA HealthFirst	10 × 10	100
Magnesium Sulfate	51662-1352-01	HF Acquisition Co. LLC, DBA HealthFirst	50	4
Magnesium Sulfate	51662-1352-03	HF Acquisition Co. LLC, DBA HealthFirst	24 × 50	96
Magnesium Sulfate	51662-1390-01	HF Acquisition Co. LLC, DBA HealthFirst	2	2
Magnesium Sulfate	51662-1390-03	HF Acquisition Co. LLC, DBA HealthFirst	25 × 2	50
Magnesium Sulfate	51662-1451-01	HF Acquisition Co. LLC, DBA HealthFirst	10	10
Magnesium Sulfate	51754-1000-04	Exela Pharma Sciences, LLC	25 × 10	250
Magnesium Sulfate	63323-0064-03	FreseniUS Kabi USA, LLC	25 × 2	50
Magnesium Sulfate	63323-0064-11	FreseniUS Kabi USA, LLC	25 × 10	250
Magnesium Sulfate	63323-0064-23	FreseniUS Kabi USA, LLC	25 × 2	50
Magnesium Sulfate	63323-0064-43	FreseniUS Kabi USA, LLC	25 × 2	50
Magnesium Sulfate	63323-0106-01	FreseniUS Kabi USA, LLC	24 × 100	192
Magnesium Sulfate	63323-0106-05	FreseniUS Kabi USA, LLC	24 × 50	96
Magnesium Sulfate	63323-0106-10	FreseniUS Kabi USA, LLC	12 × 1,000	960
Magnesium Sulfate	63323-0106-15	FreseniUS Kabi USA, LLC	24 × 500	960
Magnesium Sulfate	63323-0106-26	FreseniUS Kabi USA, LLC	24 × 50	96
Magnesium Sulfate	63323-0107-05	FreseniUS Kabi USA, LLC	24 × 50	192
Magnesium Sulfate	63323-0642-20	FreseniUS Kabi USA, LLC	25 × 20	500
Magnesium Sulfate	63323-0642-50	FreseniUS Kabi USA, LLC	25 × 50	1,250
Magnesium Sulfate	70121-1719-02	Amneal Pharmaceuticals, LLC	15 × 50	60
Magnesium Sulfate	70121-1719-09	Amneal Pharmaceuticals, LLC	24 × 50	96
Magnesium Sulfate	70121-1720-03	Amneal Pharmaceuticals, LLC	12 × 100	96
Magnesium Sulfate	70121-1720-09	Amneal Pharmaceuticals, LLC	24 × 100	192
Magnesium Sulfate	70860-0501-82	Athenex Pharmaceutical Division, LLC	24 × 100	192
Magnesium Sulfate	70860-0502-81	Athenex Pharmaceutical Division, LLC	24 × 50	192
Magnesium Sulfate	72572-0511-40	Civica, Inc.	40 × 50	160
Magnesium Sulfate	83634-0500-81	Avenacy Inc.	24 × 50	96
Magnesium Sulfate	83634-0500-82	Avenacy Inc.	24 × 100	192
Magnesium Sulfate	83634-0500-83	Avenacy Inc.	30 × 50	120
Magnesium Sulfate	83634-0501-81	Avenacy Inc.	24 × 50	192
Magnesium Sulfate in 5% Dextrose	00409-6727-23	Pfizer Inc	24 × 100	48
Magnesium Sulfate-Dextrose	00264-4400-54	B. Braun Medical Inc.	24 × 100	48
Magnesium Sulfate-Dextrose	00338-1709-40	Baxter Healthcare Corporation	40 × 100	80
Magnesium Sulfate-Dextrose	44567-0410-24	WG Critical Care, LLC	24 × 100	48
Magnesium Sulfate-Dextrose	63323-0108-26	FreseniUS Kabi USA, LLC	24 × 100	48
Magnesium Sulfate-Dextrose	67457-0567-00	Mylan Institutional LLC	24 × 100	48

J3475: common questions

Is J3475 a CPT code?: No. J3475 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 J3475?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 60 NDCs under J3475, for Magnesium Sulfate, Magnesium Sulfate in 5% Dextrose and Magnesium Sulfate-Dextrose. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J3475?: $0.436 per 500 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 J3475?: One unit of J3475 is 500 mg, as stated in the code's descriptor. Units to report = dose given ÷ 500 mg. J-code billing units.

J3475 — Injection, magnesium sulfate, per 500 mg