No. J7631 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 J7631?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J7631, for Cromolyn Sodium. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J7631?

$0.385 per 10 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 J7631?

One unit of J7631 is 10 milligrams, as stated in the code's descriptor. Units to report = dose given ÷ 10 milligrams.

J7631 J-Code: Cromolyn sodium — Billing Units & NDCs

In short

J7631 is the HCPCS Level II code for cromolyn sodium, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per 10 milligrams. CMS assigns NDCs for Cromolyn Sodium to it. One billing unit is 10 milligrams. The Medicare Part B payment limit is $0.385 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ7631

Billing unit10 milligrams

Descriptor: Cromolyn sodium, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per 10 milligrams
Short descriptor: Cromolyn sodium noncomp unit
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2008

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$0.385

Per10 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.

HCPCS units

Modifier

NDC (11-digit)

NDC unit qualifier

NDC quantity

Enter the units to build the claim line.

NDCs billed under J7631

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to J7631 for Cromolyn Sodium. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J7631 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Cromolyn Sodium	00172-6406-49	Ivax Pharmaceuticals, Inc.	60 × 2	120
Cromolyn Sodium	76204-0028-60	Ritedose Pharmaceuticals, LLC	60 × 2	120

J7631: common questions

Is J7631 a CPT code?: No. J7631 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 J7631?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under J7631, for Cromolyn Sodium. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J7631?: $0.385 per 10 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 J7631?: One unit of J7631 is 10 milligrams, as stated in the code's descriptor. Units to report = dose given ÷ 10 milligrams. J-code billing units.

J7631 — Cromolyn sodium, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per 10 milligrams