No. J2311 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 one billing unit of J2311?

One unit of J2311 is 1 mg, as stated in the code's descriptor. Units to report = dose given ÷ 1 mg.

J2311 (Retired 2025) — Inj, naloxone hcl (zimhi)

J2311 was retired on Jun 30, 2025

CMS ended J2311 after Jun 30, 2025. Don’t report it for later dates of service. Current codes for the same drug:

Code

CMS HCPCS file

HCPCS codeJ2311

Billing unit1 mg

Descriptor: Injection, naloxone hydrochloride (zimhi), 1 mg
Short descriptor: Inj, naloxone hcl (zimhi)
Code set: HCPCS Level II, maintained by CMS
Effective: Jul 1, 2025

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

Find the NDC

Med-Code hasn’t mapped J2311 to specific products yet. Search the FDA NDC Directory for the drug named in the descriptor, and check the route and strength match the code.

Search NDCs for naloxone hydrochloride

J2311: common questions

Is J2311 a CPT code?: No. J2311 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 is one billing unit of J2311?: One unit of J2311 is 1 mg, as stated in the code's descriptor. Units to report = dose given ÷ 1 mg. J-code billing units.

J2311 — Injection, naloxone hydrochloride (zimhi), 1 mg

Code

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J2311: common questions

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