Rituxan (J9312) HCPCS Code: 2026 Oncology Billing Rules

Last Updated: September 12, 2026

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Rituxan (rituximab) is heavily utilized in oncology and rheumatology. Billed under J9312, claims require accurate chemotherapy infusion coding and 10mg unit divisions.

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Rituxan Unit Calculation (J9312)

The HCPCS code description for J9312 is "Injection, rituximab, 10 mg".

If a patient receives a standard 700 mg infusion, divide by 10. You will bill exactly 70 units.

DrugCodeAdministered DosageBilling Units
RituxanJ9312700 mg70

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Medical Necessity Linkage

Rituxan requires strict linkage to an approved LCD/NCD diagnosis, such as:

  • C82.90 - Follicular lymphoma, unspecified
  • M05.70 - Rheumatoid arthritis with rheumatoid factor

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Administration and NCCI Rules

Because Rituxan is a monoclonal antibody, bill it using chemotherapy administration codes (96413 for the first hour, 96415 for each additional hour).

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