No. J0840 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 J0840?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 1 NDC under J0840, for Crofab. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J0840?

$2,044.383 per up to 1 gm, 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.

J0840 J-Code: Crofab (crotalidae polyvalent immune fab)

In short

J0840 is the HCPCS Level II code for injection, crotalidae polyvalent immune fab (ovine), up to 1 gram. CMS assigns NDCs for Crofab to it. The Medicare Part B payment limit is $2,044.383 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ0840

Billing unitSee descriptor

Descriptor: Injection, crotalidae polyvalent immune fab (ovine), up to 1 gram
Short descriptor: Crotalidae poly immune fab
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2012

Medicare Part B payment limit

CMS ASP file

Payment limit per unit$2,044.383

Perup to 1 gm

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 J0840

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 1 NDC to J0840 for Crofab. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J0840 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Crofab	50633-0110-12	BTG International Inc.	2 × 1	2

J0840: common questions

Is J0840 a CPT code?: No. J0840 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 J0840?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 1 NDC under J0840, for Crofab. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J0840?: $2,044.383 per up to 1 gm, 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.

J0840 — Injection, crotalidae polyvalent immune fab (ovine), up to 1 gram