Summary & Overview
HCPCS A4235: Replacement Lithium Battery for Home Blood Glucose Monitor
HCPCS Level II code A4235 represents a replacement lithium battery supplied for a patient-owned, medically necessary home blood glucose monitor. Nationally, this code supports continuity of diabetes self-management by enabling replacement power sources for durable home monitoring devices. Coverage and reimbursement policies for replacement components affect access to functional devices and patient adherence to monitoring protocols.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of what this code covers, typical sites of service, and which payers are commonly involved in coverage decisions. The publication outlines benchmarks and common billing practices, highlights relevant policy considerations for suppliers and payers, and provides clinical context about the role of functioning monitors in outpatient diabetes management.
This summary is intended for a national audience and focuses on the code definition, payer coverage landscape, and the operational implications of billing for replacement batteries used with patient-owned home glucose monitors. Data not available in the input is noted where applicable.
Billing Code Overview
HCPCS Level II code A4235 describes a replacement lithium battery intended for use with a medically necessary home blood glucose monitor owned by the patient, billed per each battery. Service type: Durable Medical Equipment component / supply replacement. Typical site of service: patient's home for continued self-monitoring of blood glucose.
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with diagnosed diabetes mellitus who owns a medically necessary home blood glucose monitor and presents to the clinic or durable medical equipment (DME) supplier requiring a replacement lithium battery for that monitor. The patient may request the battery during a routine primary care or endocrinology visit, during a diabetes self-management education session, or by contacting a supplier after noticing the monitor will not power on or gives low-battery warnings. The clinical workflow includes verification of patient identity and device ownership, confirmation that the battery type is the device-specific lithium battery compatible with the patient’s personal glucose meter, documentation of medical necessity (ongoing diabetes requiring self-monitoring of blood glucose), and dispensing the replacement battery. The supplier records the device model, lot/UPC if available, and documents the service date, quantity dispensed (each), and the billing code A4235 for the replacement battery. Typical payer adjudication checks include patient eligibility, benefit coverage for DME supplies, and whether prior authorization or frequency limits apply. Usual sites of service are outpatient clinics, physician offices, and patient homes via DME suppliers. Common clinical interactions include brief patient education on battery installation and safe disposal of lithium batteries.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier | Standard use when no additional modifier applies |
52 | Reduced services | If a partial quantity or partial service is provided compared to usual supply |
53 | Discontinued procedure | If the attempt to supply/replace the battery was started but discontinued due to patient refusal or incompatibility |
59 | Data not available in the input. | Data not available in the input. |
62 | Two surgeons | Data not available in the input. |
78 | Unplanned return to the operating/procedure room | Data not available in the input. |
80 | Assistant surgeon | Data not available in the input. |
AS | Physician assistant, nurse practitioner, or clinical nurse specialist services | Use when an advanced practitioner provides the supply and service according to state scope of practice and payer rules |
KL | Prosthetic/orthotic local coverage variation | Use when local coverage determinations require a specific modifier for DME battery coverage |
KX | Requirements specified in the medical policy have been met | Use when documentation meets payer medical necessity policy for DME supply coverage |
NR | Non-covered item | Use when the item is known to be non-covered and billed for informational purposes |
NU | New equipment | Use if the battery is billed as new equipment component per payer definitions |
NUKL | Data not available in the input. | Data not available in the input. |
RR | Repeat procedure by same physician | Use when multiple identical supplies are billed within a short interval and payer requires indication of repetition |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
103K00000X | Family Medicine | Primary care clinicians who manage diabetes and authorize DME supplies |
207R00000X | Internal Medicine | Internists and endocrinologists who manage diabetes and document need for home glucose monitoring |
207RE0101X | Endocrinology | Specialists who manage complex diabetes patients and prescribe/authorize related DME supplies |
1835S0001X | Registered Nurse | Nurses involved in diabetes education and coordination with DME suppliers |
3336C0002X | Durable Medical Equipment Supplier | Suppliers who dispense replacement batteries and bill using HCPCS codes |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
E11.9 | Type 2 diabetes mellitus without complications | Common indication for home blood glucose monitoring and necessity for replacement batteries for personal glucose meters |
E10.9 | Type 1 diabetes mellitus without complications | Type 1 diabetic patients require frequent self-monitoring; batteries for monitors are clinically relevant |
E11.65 | Type 2 diabetes mellitus with hyperglycemia | Patients with uncontrolled glucose may require more frequent monitoring, increasing battery use |
E11.21 | Type 2 diabetes mellitus with diabetic nephropathy | Patients with complications continue home monitoring; documentation supports medical necessity for supplies |
R73.9 | Elevated blood glucose level, unspecified | Patients undergoing evaluation for hyperglycemia may need home monitoring equipment and replacement batteries |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
99213 | Office or other outpatient visit for the evaluation and management of an established patient, typically 15 minutes | Common visit code when a clinician documents diabetes management and authorizes or documents the need for a replacement battery for a home glucose monitor |
G0108 | Diabetes outpatient self-management training services, individual, per 30 minutes | May accompany supply of replacement battery during an education session on home glucose monitoring |
S9088 | Diabetes device supply, ancillary supplies, not elsewhere classified | May be used by some payers/suppliers to bill ancillary supplies related to diabetes care when appropriate |
99070 | Supplies and materials (except spectacles), provided by the physician over and above those usually included with the office visit | May be used when a physician provides a battery directly to the patient during an office visit and payer allows practice-supplied item billing |
A9270 | Non-covered item or service | Used when the battery is non-covered and documentation for informational billing is required |