HCPCS Level II · unclassified
J2312 — Injection, naloxone hydrochloride, not otherwise specified, 0.01 mg
In short
J2312 is the HCPCS Level II code for injection, naloxone hydrochloride, not otherwise specified, 0.01 mg: drugs with no specific code of their own. It has no fixed drug or unit, so the claim carries the NDC of the drug given and its quantity.
Code
CMS HCPCS fileHCPCS codeJ2312
Billing unit0.01 mg
- Descriptor
- Injection, naloxone hydrochloride, not otherwise specified, 0.01 mg
- Short descriptor
- Inj naloxone hcl nos, 0.01mg
- 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.
Medicare Part B payment limit
CMS ASP filePayment limit per unit$0.076
Per0.01 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
Enter the dose to get the units and the NDC line for the CMS-1500 and the 837P.
Enter the units to build the claim line.
NDCs billed under J2312
CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 47 NDCs to J2312 for Naloxone HCl. Billing units per package are CMS’s figures for this code’s unit.
| Drug | NDC (11-digit) | Labeler | Package | Billing units per package |
|---|---|---|---|---|
| Naloxone HCl | 00404-9773-01 | Henry Schein Inc. | 1 | 40 |
| Naloxone HCl | 00404-9920-01 | Henry Schein Inc. | 1 | 40 |
| Naloxone HCl | 00404-9921-02 | Henry Schein Inc. | 2 | 200 |
| Naloxone HCl | 00404-9922-02 | Henry Schein Inc. | 2 | 200 |
| Naloxone HCl | 00404-9923-01 | Henry Schein Inc. | 1 | 40 |
| Naloxone HCl | 00409-1215-01 | Pfizer Inc | 10 × 1 | 400 |
| Naloxone HCl | 00409-1219-01 | Pfizer Inc | 25 × 10 | 10,000 |
| Naloxone HCl | 00409-1782-69 | Pfizer Inc | 10 × 1 | 400 |
| Naloxone HCl | 00641-6132-25 | Hikma Pharmaceuticals USA Inc. | 25 × 1 | 1,000 |
| Naloxone HCl | 00641-6193-10 | Hikma Pharmaceuticals USA Inc. | 10 × 1 | 400 |
| Naloxone HCl | 00641-6205-10 | Hikma Pharmaceuticals USA Inc. | 10 × 2 | 4,000 |
| Naloxone HCl | 36000-0308-10 | Baxter Healthcare Corporation | 10 × 1 | 400 |
| Naloxone HCl | 36000-0310-02 | Baxter Healthcare Corporation | 10 | 400 |
| Naloxone HCl | 42023-0224-01 | Endo USA, Inc. | 2 | 200 |
| Naloxone HCl | 43066-0142-10 | Baxter Healthcare Corporation | 10 × 2 | 2,000 |
| Naloxone HCl | 43598-0750-10 | Dr. Reddy's Laboratories Inc. | 10 × 2 | 2,000 |
| Naloxone HCl | 43598-0750-58 | Dr. Reddy's Laboratories Inc. | 10 × 2 | 2,000 |
| Naloxone HCl | 50090-3294-00 | A-S Medication Solutions | 10 × 1 | 400 |
| Naloxone HCl | 50090-5427-00 | A-S Medication Solutions | 10 × 1 | 400 |
| Naloxone HCl | 50090-6491-00 | A-S Medication Solutions | 10 × 1 | 400 |
| Naloxone HCl | 51662-1238-01 | HF Acquisition Co. LLC, DBA HealthFirst | 1 | 40 |
| Naloxone HCl | 51662-1239-01 | HF Acquisition Co. LLC, DBA HealthFirst | 2 | 200 |
| Naloxone HCl | 51662-1239-03 | HF Acquisition Co. LLC, DBA HealthFirst | 10 × 2 | 2,000 |
| Naloxone HCl | 51662-1242-01 | HF Acquisition Co. LLC, DBA HealthFirst | 1 | 40 |
| Naloxone HCl | 51662-1242-03 | HF Acquisition Co. LLC, DBA HealthFirst | 50 × 1 | 2,000 |
| Naloxone HCl | 51662-1385-01 | HF Acquisition Co. LLC, DBA HealthFirst | 10 | 400 |
| Naloxone HCl | 51662-1586-01 | HF Acquisition Co. LLC, DBA HealthFirst | 2 | 200 |
| Naloxone HCl | 51662-1586-03 | HF Acquisition Co. LLC, DBA HealthFirst | 10 × 2 | 2,000 |
| Naloxone HCl | 51662-1673-01 | Henry Schein Inc. | 10 | 400 |
| Naloxone HCl | 55150-0328-10 | Eugia US LLC | 10 × 10 | 4,000 |
| Naloxone HCl | 55150-0345-10 | Eugia US LLC | 10 × 2 | 2,000 |
| Naloxone HCl | 67457-0292-02 | Mylan Institutional LLC | 10 × 1 | 400 |
| Naloxone HCl | 67457-0299-10 | Mylan Institutional LLC | 10 × 10 | 4,000 |
| Naloxone HCl | 67457-0599-02 | Mylan Institutional LLC | 10 × 1 | 400 |
| Naloxone HCl | 67457-0645-02 | Mylan Institutional LLC | 10 × 1 | 400 |
| Naloxone HCl | 67457-0987-10 | Mylan Institutional LLC | 10 × 10 | 4,000 |
| Naloxone HCl | 67457-0992-02 | Mylan Institutional LLC | 2 | 400 |
| Naloxone HCl | 70069-0071-10 | Somerset Pharma, LLC | 10 × 1 | 400 |
| Naloxone HCl | 70069-0072-10 | Somerset Pharma, LLC | 10 × 10 | 4,000 |
| Naloxone HCl | 70756-0658-10 | Lifestar Pharma | 10 × 1 | 400 |
| Naloxone HCl | 70756-0658-25 | Lifestar Pharma | 25 × 1 | 1,000 |
| Naloxone HCl | 70756-0850-10 | Lifestar Pharma | 10 × 1 | 400 |
| Naloxone HCl | 72572-0450-25 | Civica, Inc. | 25 × 1 | 1,000 |
| Naloxone HCl | 72603-0590-10 | Northstar RxLLC | 10 × 1 | 400 |
| Naloxone HCl | 72603-0590-25 | Northstar RxLLC | 25 × 1 | 1,000 |
| Naloxone HCl | 76045-0112-20 | FreseniUS Kabi USA, LLC | 24 × 2 | 4,800 |
| Naloxone HCl | 76045-0114-10 | FreseniUS Kabi USA, LLC | 24 × 1 | 960 |
J2312: common questions
- Is J2312 a CPT code?
- No. J2312 is a HCPCS Level II code, maintained by CMS, that identifies a drug with no specific code of its own. 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 NDC goes with J2312?
- None is fixed. J2312 is used for drugs that have no specific HCPCS code, so the claim carries the NDC of the drug actually given and its quantity, and payers usually also ask for the drug name and dose. How to find a J-code.
- What is the Medicare payment limit for J2312?
- $0.076 per 0.01 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.