No. J0558 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 J0558?

CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 3 NDCs under J0558, for Bicillin CR. The table on this page shows each one with its billing units per package.

What is the Medicare payment limit for J0558?

$19.523 per 100,000 units, 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 J0558?

One unit of J0558 is 000 units, as stated in the code's descriptor. Units to report = dose given ÷ 000 units.

J0558 J-Code: Bicillin CR

In short

J0558 is the HCPCS Level II code for injection, penicillin g benzathine and penicillin g procaine, 100,000 units. CMS assigns NDCs for Bicillin CR to it. One billing unit is 000 units. The Medicare Part B payment limit is $19.523 per unit (October 1, 2026 through December 31, 2026).

Code

CMS HCPCS file

HCPCS codeJ0558

Billing unit000 units

Descriptor: Injection, penicillin g benzathine and penicillin g procaine, 100,000 units
Short descriptor: Peng benzathine/procaine inj
Code set: HCPCS Level II, maintained by CMS
Effective: Jan 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$19.523

Per100,000 units

Coinsurance15.704%

Effective October 1, 2026 through December 31, 2026. Payment allowance limits subject to the ASP methodology are based on 2Q26 ASP data. CMS note: Inflation-adjusted coinsurance. A payment limit is not a coverage decision; the Medicare contractor decides coverage. CMS ASP pricing files

Units and claim line

Units = dose given ÷ 000 units. For example, 0 units is units. 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 J0558

CMS’s ASP NDC–HCPCS crosswalk (effective October 1, 2026 through December 31, 2026) assigns 3 NDCs to J0558 for Bicillin CR. Billing units per package are CMS’s figures for this code’s unit.

NDCs assigned to J0558 in the CMS ASP crosswalk
Drug	NDC (11-digit)	Labeler	Package	Billing units per package
Bicillin CR	60793-0600-10	Pfizer Inc	10 × 2	120
Bicillin CR	60793-0601-10	Pfizer Inc	10 × 2	120
Bicillin CR	60793-0602-10	Pfizer Inc	10 × 2	120

J0558: common questions

Is J0558 a CPT code?: No. J0558 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 J0558?: CMS's ASP crosswalk for October 1, 2026 through December 31, 2026 lists 3 NDCs under J0558, for Bicillin CR. The table on this page shows each one with its billing units per package.
What is the Medicare payment limit for J0558?: $19.523 per 100,000 units, 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 J0558?: One unit of J0558 is 000 units, as stated in the code's descriptor. Units to report = dose given ÷ 000 units. J-code billing units.

J0558 — Injection, penicillin g benzathine and penicillin g procaine, 100,000 units