A7021 — Supplies and accessories for lung expansion airway clearance, continuous high frequency oscillation, and nebulization device (e.g., handset, nebulizer kit, biofilter)
HCPCS Level II A-code · short descriptor: “Suppl and access lung expan”
- 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
- 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.
A7021 Medicare fee schedule (October 2026)
NU — New purchase Inexpensive or routinely purchased
Medicare allowable ranges from $135.58 to $255.06 depending on state and rural status.
| State | Non-rural | Rural |
|---|---|---|
| AK | $224.12 | — |
| AL | $136.37 | — |
| AR | $136.37 | — |
| AZ | $135.58 | — |
| CA | $136.30 | — |
| CO | $139.65 | — |
| CT | $144.70 | — |
| DC | $137.82 | — |
| DE | $137.82 | — |
| FL | $136.37 | — |
| GA | $136.37 | — |
| HI | $226.37 | — |
| IA | $136.39 | — |
| ID | $139.65 | — |
| IL | $137.05 | — |
| IN | $137.05 | — |
| KS | $136.39 | — |
| KY | $136.37 | — |
| LA | $136.37 | — |
| MA | $144.70 | — |
| MD | $137.82 | — |
| ME | $144.70 | — |
| MI | $137.05 | — |
| MN | $136.39 | — |
| MO | $136.39 | — |
| MS | $136.37 | — |
| MT | $139.65 | — |
| NC | $136.37 | — |
| ND | $136.39 | — |
| NE | $136.39 | — |
| NH | $144.70 | — |
| NJ | $137.82 | — |
| NM | $135.58 | — |
| NV | $136.30 | — |
| NY | $137.82 | — |
| OH | $137.05 | — |
| OK | $135.58 | — |
| OR | $136.30 | — |
| PA | $137.82 | — |
| PR | $255.06 | — |
| RI | $144.70 | — |
| SC | $136.37 | — |
| SD | $136.39 | — |
| TN | $136.37 | — |
| TX | $135.58 | — |
| UT | $139.65 | — |
| VA | $136.37 | — |
| VI | $228.25 | — |
| VT | $144.70 | — |
| WA | $136.30 | — |
| WI | $137.05 | — |
| WV | $136.37 | — |
| WY | $139.65 | — |
Unit limit (MUE)
Medicare's Medically Unlikely Edit caps A7021 at 3 units per date of service (clinical). Units above the MUE deny — typically as CO-151. Rationale: Code Descriptor / CPT Instruction.
Common denial codes to watch
Related A-codes
Bill A7021 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 checkPrefer DIY compliance? Self-audit documentation kits for DME suppliers →
Building an AI agent? Try the agent API in the playground — free PA-required lookups, A7021 included, and starter credits via POST /bot-marketplace/register.