HCPCS Level II J0638: Canakinumab Injection, 1 mg

HCPCS Level II code J0638 describes an injectable biologic product, canakinumab, billed per 1 mg unit for administration as a subcutaneous or intravenous medication; the service is the injection of canakinumab typically provided in outpatient infusion centers, physician offices, or specialty clinics for conditions treated with this interleukin‑1β inhibitor.

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HCPCS Level II J0638: Canakinumab Injection, 1 mg

Customize your policy alerts

Sign up for hcpcs J0638 policy alerts

Get alerted when payer policies referencing J0638 are released or updated.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with a documented autoinflammatory condition such as familial Mediterranean fever or periodic fever syndromes, or a patient with refractory gout or adult-onset Still disease, requiring targeted interleukin-1 beta inhibition. The medication J0638 (canakinumab, 1 mg per unit) is provided as a subcutaneous injection prepared by clinic nursing staff from vials or prefilled syringes and administered in an outpatient infusion/injection suite, specialty clinic, or physician office. The clinical workflow includes verification of indication and prior authorization, documentation of baseline vitals and review for active infection, preparation of the correct dose based on weight or protocol, administration by a licensed nurse, observation for immediate adverse reactions (typically 15–60 minutes depending on patient risk), and documentation of lot number, dose, route, site, and any patient counseling. Billing for J0638 is per milligram units; the number of units reported must match the exact milligrams administered. Typical payors include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare, each following their medical necessity and coverage policies for biologic agents.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96372`	Therapeutic, prophylactic, or diagnostic injection (subcutaneous or intramuscular); single or initial substance/drug	Commonly used to report the administration service for a subcutaneous canakinumab injection when separate from the drug J-code
`96365`	Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour	Used if an IV infusion is required for administration or observation in unusual circumstances
`36415`	Collection of venous blood by venipuncture	Often performed prior to biologic dosing for baseline labs such as CBC or inflammatory markers
`97034`	Apply/continue hot/cold packs (not commonly used)	Not typically related but included only if ancillary supportive services are provided during the visit
`99070`	Supplies and materials, administrative, not covered by basic service	Use for special supplies associated with drug administration when payor allows separate supply billing

Related Modifiers

5 rows

Modifier	Description	When to Use
78	CPT 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…
80	CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…	- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
82	Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…	- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207RC0000X	Cardiovascular Disease Physician	An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
208000000X	Pediatrics Physician	A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectru…
363L00000X	Nurse Practitioner	(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
367500000X	Certified Registered Nurse Anesthetist	(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, prov…
1744P3200X	Prosthetics Case Management	A case manager who provides services for patients with prosthetics.
261QR0405X	Substance Use Disorder Rehabilitation Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
364SP0810X	Child & Family Psychiatric/Mental Health Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
335V00000X	Portable X-ray and/or Other Portable Diagnostic Imaging Supplier	A supplier that provides one or more of the following portable services, including but not limited to, x-ray, electrocardiogram (EKG), long-term EKG (…

Related Codes

HCPCS-J0013-ESKETAMINE-NASAL-SPRAY-1MG

HCPCS Level II J0013: Esketamine Nasal Spray, 1 mg

HCPCS-J0120-INJECTION-TETRACYCLINE-250MG

HCPCS Level II J0120: Injection, Tetracycline, up to 250 mg

HCPCS-J0121-OMADACYCLINE-INJECTION-1MG

HCPCS Level II J0121: Omadacycline Injection, 1 mg

HCPCS-J0122-ERAVACYCLINE-INJECTION-1MG

HCPCS Level II J0122: Injection, eravacycline, 1 mg

HCPCS-J0129-ABATACEPT-INJECTION-10MG-PHYSICIAN-SUPERVISED

HCPCS Level II J0129: Abatacept Injection, 10 mg

HCPCS-J0130-INJECTION-ABCIXIMAB-10MG

HCPCS Level II J0130: Injection abciximab, 10 mg

HCPCS-J0131-INJECTION-ACETAMINOPHEN-10MG-PARENTERAL-ANALGESIC

HCPCS Level II J0131: Injection, Acetaminophen 10 mg

HCPCS-J0132-INJECTION-ACETYLCYSTEINE-100MG-INJECTABLE-MEDICATION

HCPCS Level II J0132: Injection, Acetylcysteine 100 mg

HCPCS-J0133-ACYCLOVIR-INJECTION-5MG

HCPCS Level II J0133: Injection, Acyclovir 5 mg

HCPCS-J0134-ACETAMINOPHEN-INJECTION-FRESENIUS-KABI-10MG

HCPCS Level II J0134: Injection, Acetaminophen (10 mg)

Showing 1–10 of 991

Frequently Asked Questions

References

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.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.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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Clinical & Coding Specifications

Clinical Context

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`96372`	Therapeutic, prophylactic, or diagnostic injection (subcutaneous or intramuscular); single or initial substance/drug	Commonly used to report the administration service for a subcutaneous canakinumab injection when separate from the drug J-code
`96365`	Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour	Used if an IV infusion is required for administration or observation in unusual circumstances
`36415`	Collection of venous blood by venipuncture	Often performed prior to biologic dosing for baseline labs such as CBC or inflammatory markers
`97034`	Apply/continue hot/cold packs (not commonly used)	Not typically related but included only if ancillary supportive services are provided during the visit
`99070`	Supplies and materials, administrative, not covered by basic service	Use for special supplies associated with drug administration when payor allows separate supply billing

Related Modifiers

5 rows

Modifier	Description	When to Use
78	CPT 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…
80	CPT® Modifier 80 (Assistant Surgeon) is appended to a surgical CPT code when a physician (MD or DO) provides full, continuous assistance throughout the operative procedure. It is intended only for…	- Use CPT Modifier -80 when a physician (MD or DO) serves as an assistant surgeon and provides full, continuous assistance throughout the entire operative procedure; append -80 to the surgical CPT…
82	Modifier 82 is appended to a surgical CPT code to indicate that an attending physician acted as an assistant because a qualified resident surgeon was unavailable. In teaching hospitals it documents…	- When to use: Append modifier 82 in teaching-hospital settings to indicate a physician served as an assistant surgeon because a qualified resident surgeon was unavailable (includes situations where…
62	Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…	- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
52	Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…	- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…

Related Provider Taxonomies

8 rows

Taxonomy Code	Specialty	Notes
207RC0000X	Cardiovascular Disease Physician	An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threaten…
208000000X	Pediatrics Physician	A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectru…
363L00000X	Nurse Practitioner	(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision mak…
367500000X	Certified Registered Nurse Anesthetist	(1) A licensed registered nurse with advanced specialty education in anesthesia who, in collaboration with appropriate health care professionals, prov…
1744P3200X	Prosthetics Case Management	A case manager who provides services for patients with prosthetics.
261QR0405X	Substance Use Disorder Rehabilitation Clinic/Center	Ambulatory Health Care Facilities · Clinic/Center
364SP0810X	Child & Family Psychiatric/Mental Health Clinical Nurse Specialist	Physician Assistants & Advanced Practice Nursing Providers · Clinical Nurse Specialist
335V00000X	Portable X-ray and/or Other Portable Diagnostic Imaging Supplier	A supplier that provides one or more of the following portable services, including but not limited to, x-ray, electrocardiogram (EKG), long-term EKG (…

Related Codes

HCPCS-J0013-ESKETAMINE-NASAL-SPRAY-1MG

HCPCS Level II J0013: Esketamine Nasal Spray, 1 mg

HCPCS-J0120-INJECTION-TETRACYCLINE-250MG

HCPCS Level II J0120: Injection, Tetracycline, up to 250 mg

HCPCS-J0121-OMADACYCLINE-INJECTION-1MG

HCPCS Level II J0121: Omadacycline Injection, 1 mg

HCPCS-J0122-ERAVACYCLINE-INJECTION-1MG

HCPCS Level II J0122: Injection, eravacycline, 1 mg

HCPCS-J0129-ABATACEPT-INJECTION-10MG-PHYSICIAN-SUPERVISED

HCPCS Level II J0129: Abatacept Injection, 10 mg

HCPCS-J0130-INJECTION-ABCIXIMAB-10MG

HCPCS Level II J0130: Injection abciximab, 10 mg

HCPCS-J0131-INJECTION-ACETAMINOPHEN-10MG-PARENTERAL-ANALGESIC

HCPCS Level II J0131: Injection, Acetaminophen 10 mg

HCPCS-J0132-INJECTION-ACETYLCYSTEINE-100MG-INJECTABLE-MEDICATION

HCPCS Level II J0132: Injection, Acetylcysteine 100 mg

HCPCS-J0133-ACYCLOVIR-INJECTION-5MG

HCPCS Level II J0133: Injection, Acyclovir 5 mg

HCPCS-J0134-ACETAMINOPHEN-INJECTION-FRESENIUS-KABI-10MG

HCPCS Level II J0134: Injection, Acetaminophen (10 mg)

Showing 1–10 of 991

Frequently Asked Questions

References

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.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.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.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

HCPCS Level II J0638: Canakinumab Injection, 1 mg

Sign up for hcpcs J0638 policy alerts

HCPCS Level II J0638: Canakinumab Injection, 1 mg

Sign up for hcpcs J0638 policy alerts

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS code J0638 represent and how should units be reported?

Which CPT codes are commonly reported with J0638 for administration and related services?

When should modifiers like JW or JZ be used with J0638 on claims?

What is the typical clinical workflow and site of service for administering canakinumab (J0638)?

Which payers commonly cover J0638 and do their policies vary?

References

Clinical & Coding Specifications

Clinical Context

Related CPT Codes

Related Modifiers

Related Provider Taxonomies

Related Codes

What does HCPCS code J0638 represent and how should units be reported?

Which CPT codes are commonly reported with J0638 for administration and related services?

When should modifiers like JW or JZ be used with J0638 on claims?

What is the typical clinical workflow and site of service for administering canakinumab (J0638)?

Which payers commonly cover J0638 and do their policies vary?

References