K0604 — Replacement battery for external infusion pump owned by patient, lithium, 3.6 volt, each
K0604 is a HCPCS Level II code for replacement battery for external infusion pump owned by patient, lithium, 3.6 volt, each. It belongs to the Durable Medical Equipment (DME MAC Temporary) section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Medically Unlikely Edits — units per day
The most units of K0604 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · CMS Policy
- outpatient
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · CMS Policy
- DME supplier
- 6 units MAI 3 — Date of Service Edit: Clinical · Clinical: Data
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for K0604
- Long descriptor
- Replacement battery for external infusion pump owned by patient, lithium, 3.6 volt, each
- Short descriptor
- Repl batt lithium 3.6 v
- Added
- April 1, 2003
- BETOS
- D1E
- Pricing indicator
- 32 — DMEPOS
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Inexpensive and routinely purchased DME. Price subject to floors and ceilings.
Codes adjacent to K0604
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If K0604 is not quite right, the correct code is very often within a few positions of it.
- K0455Infusion pump used for uninterrupted parenteral administration of medication, (e.g., epoprostenol or treprostinol)
- K0462Temporary replacement for patient owned equipment being repaired, any type
- K0552Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each
- K0553Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of serviceterminated
- K0554Receiver (monitor), dedicated, for use with therapeutic glucose continuous monitor systemterminated
- K0601Replacement battery for external infusion pump owned by patient, silver oxide, 1.5 volt, each
- K0602Replacement battery for external infusion pump owned by patient, silver oxide, 3 volt, each
- K0603Replacement battery for external infusion pump owned by patient, alkaline, 1.5 volt, each
- K0605Replacement battery for external infusion pump owned by patient, lithium, 4.5 volt, each
- K0606Automatic external defibrillator, with integrated electrocardiogram analysis, garment type
- K0607Replacement battery for automated external defibrillator, garment type only, each
- K0608Replacement garment for use with automated external defibrillator, each
- K0609Replacement electrodes for use with automated external defibrillator, garment type only, each
- K0669Wheelchair accessory, wheelchair seat or back cushion, does not meet specific code criteria or no written coding verification from dme pdac
- K0672Addition to lower extremity orthosis, removable soft interface, all components, replacement only, each
- K0730Controlled dose inhalation drug delivery system
Questions about K0604
What is HCPCS code K0604?
K0604 is a HCPCS Level II code for replacement battery for external infusion pump owned by patient, lithium, 3.6 volt, each. It sits in the Durable Medical Equipment (DME MAC Temporary) section.
Does Medicare cover K0604?
The CMS HCPCS file marks K0604 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.