A7018 — Water, distilled, used with large volume nebulizer, 1000 ml
A7018 is a HCPCS Level II code for water, distilled, used with large volume nebulizer, 1000 ml. It belongs to the Transportation, Medical & Surgical Supplies, Administrative section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Carrier judgment
Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
From the coverage field of the CMS Alpha-Numeric HCPCS File, release 2026Q3-Jul. This states Medicare’s position on the code, not on your particular claim.
Physician fee schedule statusX
Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.
Global period: XXX
Want the dollar amount for your locality? The fee calculator applies your GPCI and the current conversion factor.
Medically Unlikely Edits — units per day
The most units of A7018 Medicare will pay on one date of service. Bill more on a single line and it is denied. The limit is not the same in every setting, so the row that matters is the one matching the claim you are building.
- practitioner
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · CMS Policy
- outpatient
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · CMS Policy
The adjudication indicator decides whether exceeding the limit is worth appealing at all: MAI 1 is a line edit you can support with documentation, MAI 3 is a date-of-service edit that is also appealable, and MAI 2 is absolute — no documentation overrides it. CMS MUE 2026Q3.
The CMS record for A7018
- Long descriptor
- Water, distilled, used with large volume nebulizer, 1000 ml
- Short descriptor
- Water distilled w/nebulizer
- Added
- January 1, 2001
- BETOS
- D1E
- Pricing indicator
- 32 — DMEPOS
The official wording. This is what the code means.
CMS's 28-character form, which is what shows up on a remittance advice.
When CMS introduced the code.
Berenson-Eggers Type of Service — CMS's own analytic grouping.
Inexpensive and routinely purchased DME. Price subject to floors and ceilings.
Codes adjacent to A7018
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If A7018 is not quite right, the correct code is very often within a few positions of it.
- A7010Corrugated tubing, disposable, used with large volume nebulizer, 100 feet
- A7011Corrugated tubing, non-disposable, used with large volume nebulizer, 10 feetterminated
- A7012Water collection device, used with large volume nebulizer
- A7013Filter, disposable, used with aerosol compressor or ultrasonic generator
- A7014Filter, nondisposable, used with aerosol compressor or ultrasonic generator
- A7015Aerosol mask, used with dme nebulizer
- A7016Dome and mouthpiece, used with small volume ultrasonic nebulizer
- A7017Nebulizer, durable, glass or autoclavable plastic, bottle type, not used with oxygen
- A7020Interface for cough stimulating device, includes all components, replacement only
- A7021Supplies and accessories for lung expansion airway clearance, continuous high frequency oscillation, and nebulization device (e.g., handset, nebulizer kit, biofilter)
- A7023Mechanical allergen particle barrier/inhalation filter, cream, nasal, topical
- A7025High frequency chest wall oscillation system vest, replacement for use with patient owned equipment, each
- A7026High frequency chest wall oscillation system hose, replacement for use with patient owned equipment, each
- A7027Combination oral/nasal mask, used with continuous positive airway pressure device, each
- A7028Oral cushion for combination oral/nasal mask, replacement only, each
- A7029Nasal pillows for combination oral/nasal mask, replacement only, pair
Questions about A7018
What is HCPCS code A7018?
A7018 is a HCPCS Level II code for water, distilled, used with large volume nebulizer, 1000 ml. It sits in the Transportation, Medical & Surgical Supplies, Administrative section.
Does Medicare cover A7018?
The CMS HCPCS file marks A7018 as "Carrier judgment". Coverage is decided by your Medicare contractor, not by national policy. Whether this is paid depends on the LCD for your jurisdiction and on what the documentation supports.
How is A7018 paid under the physician fee schedule?
A7018 carries PFS status code X. Statutory exclusion. The item or service is not within the statutory definition of 'physician services', so the fee schedule never pays it.