A4594 — Neuromodulation stimulator system, adjunct to rehabilitation therapy regime, mouthpiece each
HCPCS Level II A-code · short descriptor: “Neuromod adj rehab mouthpie”
- 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
- Inexpensive or routinely purchased
- Prior authorization
- Not on Medicare required-PA list
- Status
- Active (April 2026 HCPCS)
Prior authorization
Not on the Medicare required-PA list as of the January 13, 2026 update (74 items). Medicare Advantage and commercial plans set their own prior-authorization rules for this code — verify per plan before delivery.
A4594 Medicare fee schedule (April 2026)
NU — New purchase Inexpensive or routinely purchased
Medicare allowable: $3095.12 in all listed states.
Former-CBA payment limits: ceiling $3095.12 · floor $2630.85
| State | Non-rural | Rural |
|---|---|---|
| AK | $3095.12 | — |
| AL | $3095.12 | — |
| AR | $3095.12 | — |
| AZ | $3095.12 | — |
| CA | $3095.12 | — |
| CO | $3095.12 | — |
| CT | $3095.12 | — |
| DC | $3095.12 | — |
| DE | $3095.12 | — |
| FL | $3095.12 | — |
| GA | $3095.12 | — |
| HI | $3095.12 | — |
| IA | $3095.12 | — |
| ID | $3095.12 | — |
| IL | $3095.12 | — |
| IN | $3095.12 | — |
| KS | $3095.12 | — |
| KY | $3095.12 | — |
| LA | $3095.12 | — |
| MA | $3095.12 | — |
| MD | $3095.12 | — |
| ME | $3095.12 | — |
| MI | $3095.12 | — |
| MN | $3095.12 | — |
| MO | $3095.12 | — |
| MS | $3095.12 | — |
| MT | $3095.12 | — |
| NC | $3095.12 | — |
| ND | $3095.12 | — |
| NE | $3095.12 | — |
| NH | $3095.12 | — |
| NJ | $3095.12 | — |
| NM | $3095.12 | — |
| NV | $3095.12 | — |
| NY | $3095.12 | — |
| OH | $3095.12 | — |
| OK | $3095.12 | — |
| OR | $3095.12 | — |
| PA | $3095.12 | — |
| PR | $3095.12 | — |
| RI | $3095.12 | — |
| SC | $3095.12 | — |
| SD | $3095.12 | — |
| TN | $3095.12 | — |
| TX | $3095.12 | — |
| UT | $3095.12 | — |
| VA | $3095.12 | — |
| VI | $3095.12 | — |
| VT | $3095.12 | — |
| WA | $3095.12 | — |
| WI | $3095.12 | — |
| WV | $3095.12 | — |
| WY | $3095.12 | — |
Amounts are the Medicare DMEPOS fee-schedule allowables effective April 2026.
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.
Common denial codes to watch
Related A-codes
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