No. Q0138 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 Q0138?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under Q0138, for Feraheme and Ferumoxytol. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for Q0138?

$0.331 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 Q0138?

One unit of Q0138 is 1 mg (non-esrd use), as stated in the code's descriptor. Units to report = dose given ÷ 1 mg (non-esrd use).

Q0138 HCPCS Code: Feraheme (ferumoxytol) — Billing Units

In short

Q0138 is the HCPCS Level II code for injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use). CMS assigns NDCs for Feraheme and Ferumoxytol to it. One billing unit is 1 mg (non-esrd use). The Medicare Part B payment limit is $0.331 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeQ0138

Billing unit1 mg (non-esrd use)

Descriptor: Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use)
Short descriptor: Ferumoxytol, non-esrd
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 1, 2010

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$0.331

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 (non-esrd use). 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.

NDCs billed under Q0138

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 2 NDCs to Q0138 for Feraheme and Ferumoxytol. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to Q0138 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Feraheme	59338-0775-01	Covis Pharma US, Inc	17	510
Ferumoxytol	00781-3154-01	Sandoz Inc.	17	510

Q0138: common questions

Is Q0138 a CPT code?: No. Q0138 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 Q0138?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 2 NDCs under Q0138, for Feraheme and Ferumoxytol. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for Q0138?: $0.331 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 Q0138?: One unit of Q0138 is 1 mg (non-esrd use), as stated in the code's descriptor. Units to report = dose given ÷ 1 mg (non-esrd use). J-code billing units.

Q0138 — Injection, ferumoxytol, for treatment of iron deficiency anemia, 1 mg (non-esrd use)