HCPCS code J9100: Cytarabine injection, per 100 mg2026 Medicare rate & RVUs in California

CMS doesn’t publish an office rate for J9100 in California.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What J9100 covers

Cytarabine is an antimetabolite chemotherapy drug used in regimens for acute myeloid leukemia and other leukemias. Depending on the treatment plan and product, it may be given intravenously, subcutaneously, or intrathecally. Oncology practices and hospital departments commonly report the drug when they furnish it as part of chemotherapy; the route and administration method determine the associated administration service. The code identifies cytarabine itself, not a combination product containing cytarabine and another drug.

CMS assigns this code physician fee schedule status E, excluding it from the physician fee schedule. When Medicare covers the drug, payment is through another payment method; CMS identifies it as a Part B drug generally priced from quarterly Average Sales Price files. Its HCPCS coverage code indicates that special Medicare coverage instructions apply. Report one unit for each 100 mg of cytarabine furnished, based on the documented dose. Report the appropriate chemotherapy administration service separately when applicable to the route and method of administration.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where J9100 pays more and less in California

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

29 of 29 payment localities

How the J9100 rate is calculated

Each of J9100’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for J9100

J9100 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.

J9100 compared with similar codes

How to choose

J9153Daunorubicin/cytarabinePer 1 mg daunorubicin

J9153 identifies liposomal daunorubicin with cytarabine. J9100 is for cytarabine alone; select the code matching the product administered.

J9150Daunorubicin injectionPer 10 mg

J9150 identifies daunorubicin injection, not cytarabine. Use J9100 when the drug furnished is cytarabine alone.

J9130Dacarbazine injectionPer 100 mg

J9130 identifies dacarbazine injection. It is a different chemotherapy drug from cytarabine, despite the similar drug-code format.

Codes related to J9100

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates