A4239 HCPCS code: Supply allowance for non-adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of service

A4239 is the HCPCS Level II code for supply allowance for non-adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of service. The 2026 Medicare DMEPOS fee schedule pays $273.28 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 3 per day on DME suppliers. Medicare volume rose 46% from 2023 to 2024 (4,852,890 to 7,094,388 services). In 2024, 16,528 suppliers billed Medicare for A4239 (purchases), serving 795,565 beneficiaries; California, Texas, Florida accounted for 20% of services. Its average fee ranks 18 of 18 A42 codes (family range $0.61–$273.28).

Code details

2026 Medicare DMEPOS fee schedule for A4239

How the A4239 fee compares

Who bills A4239 (2024)

Counts only. Supplier and clinician names, contact lists and state-by-state detail are in Caduvo.

Medicare utilization for A4239, 2023–2024

States with the most A4239 services (2024)

NCCI unit limits (MUE)

Medicare policy articles for this code

• A52464: Glucose Monitor - Policy Article (CGS Administrators, LLC (DME MAC) Noridian Healthcare Solutions, LLC (DME MAC)) — mentions this code in its coding guidance
• 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 (495 ICD-10-CM codes)

The diagnoses most often listed as covered in the policy articles above:

Showing 10 of 495. The full list, non-covered diagnoses and CSV export are in Caduvo.

What changed for A4239

• 2026-01-01: Average state fee rose 2.0%: $267.92 to $273.28
• 2026-01-01: Average state fee (KF) rose 2.0%: $311.74 to $317.97
• 2023-01-01: A4239 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 A4239?

A4239 is the HCPCS Level II code for supply allowance for non-adjunctive, non-implanted continuous glucose monitor (CGM), includes all supplies and accessories, 1 month supply = 1 unit of service. Short descriptor: "Non-adju cgm supply allow".

How much does Medicare pay for A4239?

Under the 2026 DMEPOS fee schedule, non-rural state fees are base (base fee): $273.28; KF (FDA Class III device): $317.97. Rural fees can be higher.

Does Medicare cover A4239?

Coverage code C — Carrier judgment. Coverage is decided by the Medicare contractor (MAC) case by case.

Which diagnoses support coverage for A4239?

Medicare policy articles that cite A4239 list 495 covered ICD-10-CM diagnosis codes across 2 articles. The most cited include E08.00 (Diabetes mellitus due to underlying condition with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma (NKHHC)), E08.01 (Diabetes mellitus due to underlying condition with hyperosmolarity with coma), E08.10 (Diabetes mellitus due to underlying condition with ketoacidosis without coma). A listed diagnosis is necessary but not sufficient; the policy's other criteria still apply.

Did the Medicare fee for A4239 change in 2026?

The average non-rural state fee moved from $267.92 in 2025 to $273.28 in 2026 (+2.0%). CMS's next quarterly HCPCS and DMEPOS update takes effect January 1, 2027.

How many units of A4239 can be billed per day?

3 on DME suppliers (NCCI medically unlikely edits).

Related A42 codes

• A4206 — Syringe with needle, sterile, 1 cc or less, each
• A4207 — Syringe with needle, sterile 2 cc, each
• A4208 — Syringe with needle, sterile 3 cc, each
• A4209 — Syringe with needle, sterile 5 cc or greater, each
• A4210 — Needle-free injection device, each
• A4211 — Supplies for self-administered injections
• A4212 — Non-coring needle or stylet with or without catheter
• A4213 — Syringe, sterile, 20 cc or greater, each
• A4215 — Needle, sterile, any size, each
• A4216 — Sterile water, saline and/or dextrose, diluent/flush, 10 ml ($0.53–$0.99)
• A4217 — Sterile water/saline, 500 ml ($2.18–$4.93)
• A4218 — Sterile saline or water, metered dose dispenser, 10 ml

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Next steps

• Run a reimbursement report for a device billed under A4239
• Watch A4239 for fee, coverage and descriptor changes
• Build a full Medicare revenue model for A4239

Sources: CMS HCPCS Level II release October 2025; 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.

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