A4602 HCPCS code: Replacement battery for external infusion pump owned by patient, lithium, 1.5 volt, each
A4602 is the HCPCS Level II code for replacement battery for external infusion pump owned by patient, lithium, 1.5 volt, each. The 2026 Medicare DMEPOS fee schedule pays $5.31 to $6.33 (NU, new equipment, purchased) depending on the state. Its Medicare coverage code is C (Carrier judgment): Coverage is decided by the Medicare contractor (MAC) case by case. The NCCI unit limit is 6 per day on DME suppliers. Medicare volume fell 88% from 2022 to 2024 (594 to 70 services). In 2024, 1 suppliers billed Medicare for A4602 (purchases), serving 0 beneficiaries. Its average fee ranks 6 of 13 A46 codes billed NU (family range $2.30–$66.87).
Code details
| Field | Value |
|---|---|
| Section | A codes — Transportation, medical/surgical supplies and miscellaneous |
| Coverage code | C — Carrier judgment |
| Pricing indicator | 32 — DMEPOS: inexpensive or routinely purchased item |
| BETOS category | D1E — Other durable medical equipment |
| Added | 2015-01-01 |
| Last action effective | 2015-01-01 |
2026 Medicare DMEPOS fee schedule for A4602
| Modifier | Meaning | Lowest state fee | Highest state fee | Ceiling | Floor |
|---|---|---|---|---|---|
| NU | new equipment, purchased | $5.31 | $6.33 | $5.31 | $4.51 |
| State | Modifier | Fee | Rural fee |
|---|---|---|---|
| AK | NU | $5.31 | — |
| AL | NU | $5.31 | — |
| AR | NU | $5.31 | — |
| AZ | NU | $5.31 | — |
| CA | NU | $5.31 | — |
| CO | NU | $5.31 | — |
| CT | NU | $5.31 | — |
| DC | NU | $5.31 | — |
| DE | NU | $5.31 | — |
| FL | NU | $5.31 | — |
| GA | NU | $5.31 | — |
| HI | NU | $5.31 | — |
| IA | NU | $5.31 | — |
| ID | NU | $5.31 | — |
| IL | NU | $5.31 | — |
| IN | NU | $5.31 | — |
| KS | NU | $5.31 | — |
| KY | NU | $5.31 | — |
| LA | NU | $5.31 | — |
| MA | NU | $5.31 | — |
| MD | NU | $5.31 | — |
| ME | NU | $5.31 | — |
| MI | NU | $5.31 | — |
| MN | NU | $5.31 | — |
| MO | NU | $5.31 | — |
| MS | NU | $5.31 | — |
| MT | NU | $5.31 | — |
| NC | NU | $5.31 | — |
| ND | NU | $5.31 | — |
| NE | NU | $5.31 | — |
| NH | NU | $5.31 | — |
| NJ | NU | $5.31 | — |
| NM | NU | $5.31 | — |
| NV | NU | $5.31 | — |
| NY | NU | $5.31 | — |
| OH | NU | $5.31 | — |
| OK | NU | $5.31 | — |
| OR | NU | $5.31 | — |
| PA | NU | $5.31 | — |
| PR | NU | $6.33 | — |
| RI | NU | $5.31 | — |
| SC | NU | $5.31 | — |
| SD | NU | $5.31 | — |
| TN | NU | $5.31 | — |
| TX | NU | $5.31 | — |
| UT | NU | $5.31 | — |
| VA | NU | $5.31 | — |
| VI | NU | $5.31 | — |
| VT | NU | $5.31 | — |
| WA | NU | $5.31 | — |
| WI | NU | $5.31 | — |
| WV | NU | $5.31 | — |
| WY | NU | $5.31 | — |
How the A4602 fee compares
| Measure | Value |
|---|---|
| Rank among 13 A46 codes billed NU (lowest = 1) | 6 |
| Family fee range (average of state fees) | $2.30–$66.87 |
| Rural fee uplift | — |
Who bills A4602 (2024)
| Measure | Value |
|---|---|
| Suppliers billing rentals | — |
| Suppliers billing purchases | 1 |
| Referring clinicians | 10 |
| Medicare beneficiaries | 0 |
| States with claims | 0 |
| Year | Suppliers | Beneficiaries |
|---|---|---|
| 2022 | 5 | 63 |
| 2023 | 4 | 22 |
| 2024 | 1 | 0 |
Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.
Medicare utilization for A4602, 2022–2024
| Year | Services | Beneficiaries | Avg. allowed | Avg. paid |
|---|---|---|---|---|
| 2022 | 594 | 63 | $4.56 | $3.62 |
| 2023 | 173 | 22 | $4.96 | $3.89 |
| 2024 | 70 | 0 | $5.09 | $3.99 |
NCCI unit limits (MUE)
| Claim type | Max units per day | Rationale |
|---|---|---|
| DME suppliers | 6 | Clinical: Data |
| outpatient hospital claims | 1 | Nature of Equipment |
Medicare policy articles for this code
- A52507: External Infusion Pumps - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
Covered diagnoses (460 ICD-10-CM codes)
The diagnoses most often listed as covered in the policy articles above:
| ICD-10-CM | Diagnosis | Articles listing it |
|---|---|---|
| C91.00 | Acute lymphoblastic leukemia not having achieved remission | 1 |
| C91.01 | Acute lymphoblastic leukemia, in remission | 1 |
| C91.02 | Acute lymphoblastic leukemia, in relapse | 1 |
| D80.0 | Hereditary hypogammaglobulinemia | 1 |
| D80.2 | Selective deficiency of immunoglobulin A [IgA] | 1 |
| D80.3 | Selective deficiency of immunoglobulin G [IgG] subclasses | 1 |
| D80.4 | Selective deficiency of immunoglobulin M [IgM] | 1 |
| D80.5 | Immunodeficiency with increased immunoglobulin M [IgM] | 1 |
| D80.6 | Antibody deficiency with near-normal immunoglobulins or with hyperimmunoglobulinemia | 1 |
| D80.7 | Transient hypogammaglobulinemia of infancy | 1 |
Showing 10 of 460. The full list, non-covered diagnoses and CSV export are in Caduvo.
What changed for A4602
- 2026-01-01: Average state fee (NU) rose 1.9%: $5.23 to $5.33
- 2015-01-01: A4602 added to HCPCS Level II
- Next scheduled CMS quarterly update (HCPCS and DMEPOS fee schedule): 2027-01-01
Frequently asked questions
What is HCPCS code A4602?
A4602 is the HCPCS Level II code for replacement battery for external infusion pump owned by patient, lithium, 1.5 volt, each. Short descriptor: "Replace lithium battery 1.5v".
How much does Medicare pay for A4602?
Under the 2026 DMEPOS fee schedule, non-rural state fees are NU (new equipment, purchased): $5.31–$6.33. Rural fees can be higher.
Does Medicare cover A4602?
Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.
Which diagnoses support coverage for A4602?
Medicare policy articles that cite A4602 list 460 covered ICD-10-CM diagnosis codes across 1 article. The most cited include C91.00 (Acute lymphoblastic leukemia not having achieved remission), C91.01 (Acute lymphoblastic leukemia, in remission), C91.02 (Acute lymphoblastic leukemia, in relapse). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.
Did the Medicare fee for A4602 change in 2026?
The average non-rural state fee for NU moved from $5.23 in 2025 to $5.33 in 2026 (+1.9%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.
How many units of A4602 can be billed per day?
6 on DME suppliers; 1 on outpatient hospital claims (NCCI medically unlikely edits).
Related A46 codes
- A4600 — Sleeve for intermittent limb compression device, replacement only, each
- A4601 — Lithium ion battery, rechargeable, for non-prosthetic use, replacement
- A4604 — Tubing with integrated heating element for use with positive airway pressure device ($49.31–$76.79)
- A4605 — Tracheal suction catheter, closed system, each ($23.31–$27.99)
- A4606 — Oxygen probe for use with oximeter device, replacement
- A4608 — Transtracheal oxygen catheter, each ($71.44–$85.73)
- A4611 — Battery, heavy duty; replacement for patient owned ventilator
- A4612 — Battery cables; replacement for patient-owned ventilator
- A4613 — Battery charger; replacement for patient-owned ventilator
- A4614 — Peak expiratory flow rate meter, hand held ($33.89–$40.68)
- A4615 — Cannula, nasal ($1.04–$1.25)
- A4616 — Tubing (oxygen), per foot ($0.08–$0.10)
Building a device that would bill under a code like this? Caduvo matches a device description to HCPCS/CPT codes, Medicare coverage and payment, and the FDA pathway in one report.
Next steps
- Run a reimbursement report for a device billed under A4602
- Watch A4602 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for A4602
Sources: CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026; CMS NCCI MUE tables; CMS Medicare utilization (physician and DME supplier files); CMS Medicare Coverage Database articles. Fees are Medicare allowables, not commercial rates. Not billing or legal advice.