K0604 HCPCS Reimbursement & Policy Benchmarks | OpenPayer

Summary & Overview

HCPCS K0604: Replacement Lithium Battery for External Infusion Pump

HCPCS Level II code K0604 represents a replacement lithium battery (3.6 volt) for an external infusion pump owned by the patient. This code is part of the durable medical equipment supply categories used to bill discrete components necessary for ongoing home infusion therapy. Nationally, availability and proper coding of replacement parts like batteries influence continuity of outpatient infusion treatments and patient safety.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code denotes, typical clinical and site-of-service context, and the scope of coverage considerations across major payers. The publication summarizes common billing practices, relevant modifiers (listed separately), and where policy updates typically affect reimbursement for DME components.

The piece provides practical benchmarks for coding and billing expectations, highlights policy notes that affect reimbursement for patient‑owned equipment components, and clarifies clinical context for use with external infusion pumps. Data not available in the input is identified explicitly where applicable.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareK0604HCPCS Level IIdurable medical equipmenthome infusionreplacement batterymedical suppliesbillingDME supplies

Billing Code Overview

HCPCS Level II code K0604 describes a replacement battery for an external infusion pump owned by the patient, specified as a lithium, 3.6 volt, billed per unit (each). The service type is durable medical equipment (DME) supply intended to replace a component of a patient‑owned ambulatory infusion or medication delivery pump. The typical site of service is home use / patient residence, where the patient operates or maintains the external infusion pump.

Clinical & Coding Specifications

Clinical Context

A patient owns an external ambulatory infusion pump used for continuous subcutaneous or intravenous medication delivery (for example, insulin, pain infusion, or ambulatory antibiotic therapy). The device battery has reached end-of-life or failed, and the patient obtains a replacement battery — a lithium 3.6 volt cell identified by billing code K0604. Typical workflow: the patient contacts the durable medical equipment (DME) supplier or specialty pharmacy to order the replacement battery. The supplier verifies pump model compatibility and patient ownership, dispenses the single replacement battery, provides brief device-specific instructions for safe installation and disposal, and documents the transaction in the patient’s DME record. Typical sites of service include outpatient DME supplier locations, outpatient pharmacies, home health visits, and the patient’s home when delivered by courier or visiting clinician. Common patient scenarios include maintenance of infusion pumps for chronic pain management, ambulatory chemotherapy support, insulin infusion for diabetes, or long-term antibiotic infusions where uninterrupted pump function is required to maintain therapy continuity.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier used (placeholder)	Rarely appended; typically not used on DME items billed as HCPCS Level II.

HCPCS K0841: Power Wheelchair Group 2 Standard, 300 lb Capacity

HCPCS-K0072-FRONT-CASTER-ASSEMBLY-SEMI-PNEUMATIC-TIRE-REPLACEMENT

HCPCS K0072: Front Caster Assembly with Semi-Pneumatic Tire, Replacement Only

HCPCS-K0879-POWER-WHEELCHAIR-HEAVY-DUTY-301-450-LB-CAPACITY

HCPCS K0879: Power Wheelchair, Heavy Duty, 301–450 lb Capacity

HCPCS-K0878-POWER-WHEELCHAIR-GROUP-4-STANDARD-300-LB-CAPACITY

HCPCS K0878: Power Wheelchair Group 4 Standard, Captain's Chair, up to 300 lb

HCPCS-K0849-POWER-WHEELCHAIR-GROUP-3-CAPTAINS-CHAIR-300LBS

HCPCS K0849: Power Wheelchair, Group 3 Captain's Chair, ≤300 lb

HCPCS-K0825-POWER-WHEELCHAIR-HEAVY-DUTY-301-450-LB-CAPACITY

HCPCS K0825: Power Wheelchair, Group 2 Heavy Duty, 301–450 lb Capacity

HCPCS-K0871-POWER-WHEELCHAIR-GROUP-4-VERY-HEAVY-DUTY-451-600-LB

HCPCS K0871: Power Wheelchair Group 4, 451–600 lb Capacity

HCPCS-K0854-POWER-WHEELCHAIR-EXTRA-HEAVY-DUTY-601LBS-PLUS

HCPCS K0854: Power Wheelchair Extra Heavy Duty, 601+ lb Capacity

HCPCS-K0050-RATCHET-ASSEMBLY-REPLACEMENT

HCPCS K0050: Ratchet Assembly, Replacement Only

HCPCS-K0860-POWER-WHEELCHAIR-VERY-HEAVY-DUTY-451-600-LB

HCPCS K0860: Power Wheelchair, Very Heavy Duty, 451–600 lb

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Taxonomy Code	Specialty	Notes
`333600000X`	Durable Medical Equipment & Supplies	Suppliers and DME vendors who dispense replacement batteries.
`174400000X`	Pharmacy	Outpatient or specialty pharmacies that dispense DME-related supplies and batteries.
`363L00000X`	Home Health Agency	Clinicians providing home visits who may replace or install batteries for home infusion pumps.
`207Q00000X`	Physical Medicine & Rehabilitation	Clinicians managing infusion pumps for chronic pain or spasticity who may coordinate supply replacement.
`208000000X`	Pediatrics (General)	Pediatric specialists coordinating DME supplies for pediatric pump-dependent patients.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`E11.9`	Type 2 diabetes mellitus without complications	Insulin infusion pump users may require battery replacements to maintain subcutaneous insulin delivery.
`E10.9`	Type 1 diabetes mellitus without complications	Insulin pump-dependent patients require functioning batteries for continuous insulin infusion.
`G89.4`	Chronic pain syndrome	External ambulatory infusion pumps are sometimes used for continuous analgesic delivery; battery replacement ensures therapy continuity.
`T82.7XXA`	Infection and inflammatory reaction due to other internal prosthetic devices, implants and grafts, initial encounter	In infusion device management scenarios, device issues prompting battery replacement may be coded alongside device complications when appropriate.
`Z45.2`	Encounter for adjustment and management of automatic implantable device	Used for encounters focused on device management, including supply changes and battery replacement.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`99211`	Office or other outpatient visit for the evaluation and management of an established patient, minimal problem	May be used when a clinician documents brief evaluation related to pump function and provides instruction at a clinic visit when the battery is replaced or dispensed.
`99070`	Supplies and materials (services) provided directly to the patient which are not usually included with the office visit	May be used by some payers for non-covered or miscellaneous supplies related to pump maintenance when billing physician offices.
`99000`	Handling and/or instructing on use of DME, non-physician provider, per encounter	May be used for billing instruction or handling associated with DME supplies when allowed by payer.
`99080`	Special reports such as insurance forms, letters, and medical certifications	Used when documentation is provided to payers for medical necessity of replacement supplies.
`A4216`*	Infusion pump supplies (example supply code)	Listed here as contextual — actual CPT/HCPCS supply codes vary by item; `K0604` remains the HCPCS code for the battery itself.

Note: If payers require ancillary professional service billing for instruction or device troubleshooting, the above CPT codes are commonly used in the workflow alongside the K0604 supply dispense.

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