J1451 Fomepizole Injection HCPCS Reimbursement | OpenPayer

Summary & Overview

HCPCS J1451: Injection, fomepizole, 15 mg

HCPCS Level II code J1451 identifies a 15 mg injectable dose of fomepizole, an antidote used in the management of ethylene glycol and methanol poisoning. Nationally relevant for emergency and inpatient toxicology care, this code captures the billed drug product administered as part of acute antidotal therapy and is important for hospitals, emergency departments, and critical care units that treat toxic alcohol exposures. Key payers covered in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will learn the clinical context for use of J1451, typical sites of service, and which payers are commonly involved in reimbursement for fomepizole injections. The publication presents benchmarks and billing considerations, summarizes payer coverage patterns where available, and highlights policy updates or coding notes that affect how J1451 is billed and adjudicated. The content is intended to assist revenue cycle, clinical, and compliance teams in understanding the role of this HCPCS Level II code in urgent antidotal therapy workflows and payer interactions.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareJ1451HCPCS Level IIfomepizoleinjectionantidotetoxicologyemergency-medicineinpatient-caredrug-administration

Billing Code Overview

HCPCS Level II code J1451 represents Injection, fomepizole, 15 mg. This code describes a medication administration service for fomepizole, an antidote used in the treatment of toxic alcohol poisoning, delivered as an injectable product. The service type is medication administration/injectable therapy. The typical site of service for administration is emergent or inpatient settings such as emergency departments, intensive care units, or hospital inpatient wards where management of poisoning and parenteral antidote therapy are performed.

Clinical & Coding Specifications

Clinical Context

A patient presenting to an emergency department with suspected toxic alcohol ingestion (ethylene glycol, methanol) or with confirmed poisoning receives antidotal therapy with fomepizole (J1451). A typical scenario: an adult arrives after ingesting windshield washer fluid containing methanol. Initial evaluation includes airway, breathing, circulation stabilization, measurement of vital signs, point-of-care glucose, blood gas, basic metabolic panel including anion gap and osmolality, and serum toxic alcohol levels when available. Based on elevated anion gap metabolic acidosis, high osmolar gap, or documented toxic alcohol level, the clinical team determines the need for antidotal therapy.

Fomepizole is administered intravenously in loading and maintenance doses; J1451 represents 15 mg of the agent for billing. Administration typically occurs in the emergency department, intensive care unit, or inpatient medical ward. The clinical workflow includes:

Rapid clinical assessment and laboratory evaluation for acid-base status and toxic alcohols.
Indication confirmation by medical toxicology/poison control consultation.
Preparation of IV dose and administration by emergency or inpatient nursing under protocol.
Monitoring for clinical response and adverse effects, with repeat dosing per standard dosing schedule until toxic alcohol levels are non-toxic or elimination achieved via hemodialysis when indicated.
Documentation of dose, time, lot number, route, and any applicable modifier information for billing.

Coding Specifications

HCPCS J2778: Ranibizumab Injection, 0.1 mg

HCPCS-J0172-ADUCANUMAB-INJECTION-2MG

HCPCS J0172: Injection, aducanumab-avwa, 2 mg

HCPCS-J2472-PANTOPRAZOLE-40MG-INJECTION

HCPCS J2472: Pantoprazole Sodium 40 mg Injection

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

HCPCS Level II J0013: Esketamine Nasal Spray, 1 mg

HCPCS-J3140-TESTOSTERONE-SUSPENSION-INJECTION-50MG

HCPCS J3140: Injection, Testosterone Suspension, up to 50 mg

HCPCS-J3302-TRIAMCINOLONE-INJECTION-5MG

HCPCS Level II J3302: Triamcinolone Diacetate Injection, per 5 mg

HCPCS-J1230-METHADONE-INJECTION-10MG

HCPCS Level II J1230: Methadone HCl Injection, up to 10 mg

HCPCS-J1835-ITRACONAZOLE-INJECTION-50MG

HCPCS J1835: Injection, Itraconazole 50 mg

HCPCS-J0668-BUPIVACAINE-MELOXICAM-INSTILLATION

HCPCS J0668: Instillation of Bupivacaine and Meloxicam, 1 mg/0.03 mg

HCPCS-J3489-ZOLEDRONIC-ACID-INJECTION-1-MG

HCPCS J3489: Injection, Zoledronic Acid, 1 mg

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Modifier	Description	When to Use
`00`	No modifier — standard billing	Use when no special circumstance applies to the service.
`22`	Increased procedural services	Use when the administration required substantially greater resources (rare for drug injection but possible with prolonged complex administration).
`23`	Unusual anesthesia — used with significant anesthesia	Use if general anesthesia is required for concomitant procedures during the same encounter (infrequent).
`52`	Reduced services	Use when a reduced dose or partial administration occurred.
`53`	Discontinued procedure	Use if administration was started but discontinued due to patient condition.
`62`	Two surgeons	Use if two physicians of different specialties share surgical responsibility related to the encounter (rare for this drug).
`78`	Return to OR for related procedure	Use if patient returns to the operating room for a related procedure after initial administration.
`80`	Assistant surgeon	Use if an assistant surgeon was required for a related operative procedure.
`82`	Assistant surgeon when qualified resident not available	Use when a qualified resident was unavailable and an assistant surgeon participated.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services	Use when a PA, NP, or CNS furnishes the service incident to a physician per payer rules.
`JW`	Drug amount discarded/not administered	Use to report discarded portion of a single-use injectable vial when applicable per payer policy.
`JG`	Attending physician absence/anesthesia	Use when reporting physician absence for critical care or residency-related billing rules if applicable.
`QX`	CRNA service with medical direction by physician	Use when certified registered nurse anesthetist provides services under medical direction (if anesthesia used).

Taxonomy Code	Specialty	Notes
`208000000X`	Emergency Medicine	Most common specialty initiating fomepizole for acute toxic ingestion.
`208600000X`	Medical Toxicology	Consultants who direct antidotal therapy and dosing protocol.
`207R00000X`	Internal Medicine	Hospitalists who manage inpatient dosing and monitoring.
`363L00000X`	Critical Care Medicine	Manage patients requiring intensive monitoring or hemodialysis.
`208D00000X`	Pediatrics (if pediatric patient)	Manage dosing adjustments and pediatric-specific care.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`T51.011A`	Toxic effect of ethanol, accidental (initial encounter)	Ethanol and other toxic alcohols and alcohol-related toxicities are considered in differential; fomepizole is antidote for toxic alcohols.
`T51.011D`	Toxic effect of ethanol, accidental (subsequent encounter)	Follow-up encounters where ongoing antidotal therapy or monitoring occurs.
`T51.011S`	Toxic effect of ethanol, accidental (sequela)	Long-term sequelae documentation when relevant.
`T51.021A`	Toxic effect of methanol, accidental (initial encounter)	Primary diagnosis for methanol poisoning indicating need for fomepizole.
`T51.022A`	Toxic effect of ethylene glycol, accidental (initial encounter)	Ethylene glycol poisoning treated with fomepizole.
`R79.2`	Abnormal level of blood mineral, unspecified	Reflects electrolyte and metabolic disturbances prompting antidote and monitoring.
`R79.89`	Other specified abnormal findings of blood chemistry	Metabolic derangements associated with toxic alcohol ingestion.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`36415`	Collection of venous blood by venipuncture	Pre-administration labs (basic metabolic panel, toxic alcohol levels) required to guide fomepizole use.
`96372`	Therapeutic, prophylactic, or diagnostic injection (specify substance or drug)	Code used for administration of a single injectable drug when separate from drug J-code billing.
`96361`	Intravenous infusion for therapy, nutrition, hydration; initial, up to 1 hour	Use when continuous IV infusion or extended monitored infusion is required for administration protocols.
`93798`	Note: Data not available in the input.	Data not available in the input.

Note: "Data not available in the input." appears only where corresponding related CPT codes were not provided in the source data.

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