No. J7331 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 J7331?

$3.115 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 J7331?

One unit of J7331 is 1 mg, as stated in the code's descriptor. Units to report = dose given ÷ 1 mg.

J7331 J-Code: Synojoynt — Billing Units & NDCs

In short

J7331 is the HCPCS Level II code for hyaluronan or derivative, synojoynt, for intra-articular injection, 1 mg. One billing unit is 1 mg. The Medicare Part B payment limit is $3.115 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ7331

Billing unit1 mg

Descriptor: Hyaluronan or derivative, synojoynt, for intra-articular injection, 1 mg
Short descriptor: Synojoynt, inj., 1 mg
Code set: HCPCS Level II, maintained by CMS
Effective: Oct 1, 2019

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$3.115

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 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.

Find the NDC

Med-Code hasn’t mapped J7331 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 synojoynt

J7331: common questions

Is J7331 a CPT code?: No. J7331 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 the Medicare payment limit for J7331?: $3.115 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 J7331?: One unit of J7331 is 1 mg, as stated in the code's descriptor. Units to report = dose given ÷ 1 mg. J-code billing units.

J7331 — Hyaluronan or derivative, synojoynt, for intra-articular injection, 1 mg