A4238 — Supply allowance for adjunctive, non-implanted continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service

HCPCS Level II A-code · short descriptor: “Adju cgm supply allowance”

Code system: HCPCS Level II
Family: A — Medical & surgical supplies, ambulance
Medicare coverage status: Carrier judgment — coverage decided by the DME MAC
DMEPOS payment category: Supplies
Prior authorization: Not on Medicare required-PA list
Face-to-face & WOPD: Not on the required list
MUE unit limit: 3
Status: Active (HCPCS Level II October 2026)

Prior authorization

Not on the Medicare required-PA list (CMS Required Prior Authorization List — 74 items in force on 2026-10-25; 8 more from 2026-10-28; sources: CMS list updated 2026-01-13, CMS-6109-N (91 FR 47972)). Medicare Advantage and commercial plans set their own prior-authorization rules for this code — verify per plan before delivery.

Order readiness — what the written order must contain

Every Medicare DMEPOS claim needs a Standard Written Order with all six elements (42 CFR 410.38(d)):

Beneficiary name or Medicare Beneficiary Identifier (MBI) (42 CFR 410.38(d)(1)(i)(A))
General description of the item (42 CFR 410.38(d)(1)(i)(B))
Quantity to be dispensed, if applicable (42 CFR 410.38(d)(1)(i)(C))
Order date (42 CFR 410.38(d)(1)(i)(D))
Treating practitioner name or NPI (42 CFR 410.38(d)(1)(i)(E))
Treating practitioner signature (42 CFR 410.38(d)(1)(i)(F))

Not on the F2F/WOPD list (CMS Required F2F & WOPD List — 83 items in force on 2026-10-25; 22 more from 2026-10-28; sources: CMS list effective 2026-04-13 (91 FR 1250), CMS-6109-N (91 FR 47972)). The standard written order must reach the supplier before claim submission.

Blank requirements checklist only — MyMedi-AI never collects or stores completed orders.

A4238 Medicare fee schedule (October 2026)

KF Supplies

Medicare allowable: $280.71 in all listed states.

State	Non-rural	Rural
AK	$280.71	—
AL	$280.71	—
AR	$280.71	—
AZ	$280.71	—
CA	$280.71	—
CO	$280.71	—
CT	$280.71	—
DC	$280.71	—
DE	$280.71	—
FL	$280.71	—
GA	$280.71	—
HI	$280.71	—
IA	$280.71	—
ID	$280.71	—
IL	$280.71	—
IN	$280.71	—
KS	$280.71	—
KY	$280.71	—
LA	$280.71	—
MA	$280.71	—
MD	$280.71	—
ME	$280.71	—
MI	$280.71	—
MN	$280.71	—
MO	$280.71	—
MS	$280.71	—
MT	$280.71	—
NC	$280.71	—
ND	$280.71	—
NE	$280.71	—
NH	$280.71	—
NJ	$280.71	—
NM	$280.71	—
NV	$280.71	—
NY	$280.71	—
OH	$280.71	—
OK	$280.71	—
OR	$280.71	—
PA	$280.71	—
PR	$280.71	—
RI	$280.71	—
SC	$280.71	—
SD	$280.71	—
TN	$280.71	—
TX	$280.71	—
UT	$280.71	—
VA	$280.71	—
VI	$280.71	—
VT	$280.71	—
WA	$280.71	—
WI	$280.71	—
WV	$280.71	—
WY	$280.71	—

Amounts are the Medicare DMEPOS fee-schedule allowables effective October 2026 (CMS DMEPOS Fee Schedule October 2026 (DME26-D)). Medicare typically pays 80% of the allowable after the Part B deductible; the patient owes 20%. A 2% sequestration reduction applies to the Medicare share. Former competitive-bidding-area adjustments and non-continental rates can differ — verify with your DME MAC.

Unit limit (MUE)

Medicare's Medically Unlikely Edit caps A4238 at 3 units per date of service (clinical). Units above the MUE deny — typically as CO-151. Rationale: CMS Policy.

Common denial codes to watch

CO-50 medical necessity CO-151 frequency/units

Bill A4238 with confidence

Track prior-authorization requests with AI pre-fill and deadline tracking, and draft PA appeal letters — built for DME teams, PHI-free: no patient data is collected or stored.

Start free trial Run a CMS-0057-F readiness check

Prefer DIY compliance? Self-audit documentation kits for DME suppliers →

Building an AI agent? Try the agent API in the playground — free PA-required lookups, A4238 included, and starter credits via POST /bot-marketplace/register.