No. J2373 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 J2373?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J2373, for Immphentiv. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J2373?

$0.136 per 20 mcg, 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 J2373?

One unit of J2373 is 20 micrograms, as stated in the code's descriptor. Units to report = dose given ÷ 20 micrograms.

J2373 J-Code: Immphentiv (phenylephrine hydrochloride)

In short

J2373 is the HCPCS Level II code for injection, phenylephrine hydrochloride (immphentiv), 20 micrograms. CMS assigns NDCs for Immphentiv to it. One billing unit is 20 micrograms. The Medicare Part B payment limit is $0.136 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ2373

Billing unit20 micrograms

Descriptor: Injection, phenylephrine hydrochloride (immphentiv), 20 micrograms
Short descriptor: Inj, immphentiv, 20 mcg
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$0.136

Per20 mcg

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

Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.

HCPCS units

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the units to build the claim line.

NDCs billed under J2373

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J2373 for Immphentiv. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J2373 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Immphentiv	00641-6245-10	Hikma Pharmaceuticals USA Inc.	10 × 5	250
Immphentiv	00641-6246-10	Hikma Pharmaceuticals USA Inc.	10 × 10	500

J2373: common questions

Is J2373 a CPT code?: No. J2373 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 J2373?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J2373, for Immphentiv. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J2373?: $0.136 per 20 mcg, 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 J2373?: One unit of J2373 is 20 micrograms, as stated in the code's descriptor. Units to report = dose given ÷ 20 micrograms. J-code billing units.

J2373 — Injection, phenylephrine hydrochloride (immphentiv), 20 micrograms