J-codes are part of the HCPCS Level II code set. They identify injectable drugs, infused medications, and some non-oral chemotherapy agents that are usually administered in a clinical setting. Most J-codes start with the letter “J”, followed by four numbers. For example, J1745 represents infliximab. J3490 represents an unclassified drug. J-Codes are special codes used to bill drugs that are given by injection or infusion. You need to know how to count the billing units, which procedure codes to add, and when to include extra. These codes are used to report injectable drugs that ordinarily cannot be self-administered; chemotherapy, immunosuppressive drugs and inhalation solutions as well as some orally administered drugs. J-Codes are alphanumeric codes that start with “J” followed by four digits. They are used for: Key Points: Represent specific medications and their dosage units. Facilitate standardized billing across hospitals, clinics, and insurance providers. Ensure timely reimbursement and reduce claim denials. Example: The Centers for Medicare & Medicaid Services has assigned a permanent J-code for OCREVUS ZUNOVO effective April 1, 2025. Check with individual payers for specific requirements. Historically, Paragard® has been aligned with this J code, and continuing this alignment is important for consistent access, supply, and regulatory compliance. This stability benefits users, pharmacies, insurance companies, healthcare facilities, and regulatory bodies. J-codes are a subset of the HCPCS Level II code set maintained by the Centers for Medicare and Medicaid Services (CMS). They specifically identify injectable drugs, chemotherapy agents, biologics, and some oral drugs that lack a self-administered equivalent. Need Homebrew, source builds, provider setup, or want an agent to set it up for you? Jump to detailed installation. jcode is built to be as performant and resource efficient as possible. Every metric is optimized to the bone, which is important for scaling multi-session workflows. Terminated June 30, 2025. Terminated December 31, 2025. Terminated June 30, 2025. Terminated December 31, 2025. Terminated March 31, 2024. Terminated March 31, 2023. Terminated September 30, 2021. Terminated December 31, 2025. Terminated December 31, 2016. Terminated December 31, 2025. Terminated September 30, 2023. Terminated December 31, 2018. What Is a J-Code in Medical Billing? A J-code is a HCPCS Level II code that identifies a drug or biologic administered by a healthcare professional in a clinical setting — a physician office, hospital outpatient department, ambulatory surgery center, or infusion suite.