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    v1.0.30
    OpenPayerBilling CodesChemotherapy DrugsHCPCS hcpcs-j9601-linvoseltamab-injection-1mg
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    HCPCS J9601: Injection, linvoseltamab-gcpt, 1 mg

    HCPCS Level II code J9601 represents an injection of linvoseltamab-gcpt, billed per 1 mg unit; this code is used for administration of a monoclonal antibody therapeutic delivered by intravenous or subcutaneous injection in outpatient specialty infusion clinics or hospital outpatient departments as the service setting.

    For related coverage guidance, see recent payer policy updates: T-Cell Lymphoma Agents: Beleodaq, Istodax, Lymphir, Poteligeo, and Romidepsin, Tumor Treatment Fields - Medical Policy, Extracorporeal Photopheresis.

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    Clinical & Coding Specifications

    Clinical Context

    A 67-year-old patient with relapsed or refractory multiple myeloma is scheduled to receive linvoseltamab-gcpt therapy. The medication is supplied as an injectable monoclonal antibody dosed by milligram; billing uses J9601 per 1 mg. The patient presents to an outpatient oncology infusion center for administration. Prior to infusion, an oncologist or advanced practice provider performs a clinic visit to confirm diagnosis, prior treatments, baseline laboratory values (CBC, CMP), and eligibility. On the day of service, standard pre-infusion assessments include vital signs, evaluation for active infections, review of prior infusion reactions, and verification of infusion consent. Pharmacy prepares the weight- or dose-based syringe/vial and documents lot number and concentration; nursing performs IV access placement, medication administration per protocol, and continuous monitoring for infusion-related reactions and cytokine release syndrome during and after infusion. Post-infusion, the patient is observed for the specified monitoring period, instructed on signs/symptoms to report, and scheduled for follow-up laboratory testing and oncology visits to assess response and toxicities. Typical site of service is an outpatient hospital-based or freestanding infusion center; the service type is an injectable biologic/oncology infusion billed as a HCPCS Level II J-code for the drug product.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    96413Chemotherapy administration, intravenous infusion technique; up to 1 hour, single or initial substance/drugCommon billing for initial IV infusion/administration time associated with an oncology drug infusion session.
    96415Chemotherapy administration, intravenous infusion technique; each additional hour (List separately in addition to code for primary infusion)Used when infusion or observation extends beyond the primary hour and additional infusion time is billed.
    96365Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hourMay be used for administration of non-cytotoxic intravenous infusions when applicable per payer guidance.
    96401Chemotherapy administration, subcutaneous or intramuscular; non-hormonal anti-neoplasticUsed if a biologic or monoclonal antibody is given subcutaneously or intramuscularly instead of IV (route-dependent).
    36415Collection of venous blood by venipuncturePerformed for baseline and follow-up laboratory monitoring related to therapy safety and efficacy.

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    79Modifier 79 indicates a surgical procedure performed during the postoperative global period of a prior surgery that is unrelated to the original procedure. Per AMA/CPT and CMS guidance, it is…- Use modifier 79 when the same physician (or same‑specialty physician in the same group) performs a surgical procedure during the postoperative global period of a prior surgery and the new procedure…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RG0100X
    363LF0000X
    207RH0000X
    2085R0202X
    207Q00000X
    207R00000X
    175F00000X
    111NN0400X

    Related Payer Policy Updates

    Specialty: Hematology/Oncology1 / 3

    10 rows

    PolicyPayerEffective Date
    T-Cell Lymphoma Agents: Beleodaq, Istodax, Lymphir, Poteligeo, and RomidepsinMass General Brigham Health Plan2027-01-04
    Tumor Treatment Fields - Medical PolicyHealth-New-England2026-12-01
    Extracorporeal PhotopheresisCigna2026-11-15
    Electric Tumor Treatment Field Therapy (for Tennessee Only)Colorado Rocky Mountain Health Plans2026-11-01
    Tumor Treating Fields Therapypremerabluecrossofwashington2026-11-01
    Tumor Treating Fields Therapypremerabluecrossofwashington2026-11-01
    OmisirgeCigna2026-11-01
    Hematology - AdzynmaCigna2026-10-15
    Transcatheter Arterial Chemoembolization for Liver Tumorspremerabluecrossofwashington2026-10-01
    Cryoablation of Tumors Located in the Kidney, Lung, Breast, Pancreas, or Bonepremerabluecrossofwashington2026-10-01

    Related Codes

    HCPCS-J9000-DOXORUBICIN-10MG-INJECTION

    HCPCS J9000: Doxorubicin Hydrochloride Injection, 10 mg

    HCPCS-J9003-LEUPROLIDE-INJECTABLE-CAMCEVI-1MG

    HCPCS Level II J9003: Leuprolide injectable (camcevi etm), 1 mg

    HCPCS-J9010-ALEMTUZUMAB-INJECTION-10MG

    HCPCS Level II J9010: Injection, alemtuzumab, 10 mg

    HCPCS-J9011-DATOPOTAMAB-DERUXTECAN-INJECTION-1MG

    HCPCS J9011: Datopotamab Deruxtecan Injection, 1 mg

    HCPCS-J9015-ALDESLEUKIN-INJECTION-SINGLE-USE-VIAL

    HCPCS Level II J9015: Aldesleukin Injection, Single-Use Vial

    HCPCS-J9017-ARSENIC-TRIOXIDE-INJECTION-1MG

    HCPCS J9017: Arsenic Trioxide Injection, 1 mg

    HCPCS-J9019-ASPARAGINASE-ERWINAZE-INJECTION-1000-IU

    HCPCS Level II J9019: Asparaginase (Erwinaze) Injection, 1,000 IU

    HCPCS-J9020-ASPARAGINASE-INJECTION-10000-UNITS

    HCPCS J9020: Asparaginase Injection, 10,000 Units

    HCPCS-J9021-ASPARAGINASE-RYLAZE-INJECTION-0-1-MG

    HCPCS Level II J9021: Injection, asparaginase (Rylaze), 0.1 mg

    HCPCS-J9022-ATEZOLIZUMAB-INJECTION-10MG

    HCPCS J9022: Injection, atezolizumab 10 mg

    Showing 1–10 of 227

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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