A4483 — Moisture exchanger, disposable, for use with invasive mechanical ventilation
A4483 is a HCPCS Level II code for moisture exchanger, disposable, for use with invasive mechanical ventilation. It belongs to the Transportation, Medical & Surgical Supplies, Administrative section. Whether Medicare pays it depends on the coverage rule below.
Medicare coverage: Special coverage instructions apply
There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.
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 A4483 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
- 1 unit MAI 3 — Date of Service Edit: Clinical · Clinical: CMS Workgroup
- DME supplier
- 30 units MAI 3 — Date of Service Edit: Clinical · Clinical: Data
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 A4483
- Long descriptor
- Moisture exchanger, disposable, for use with invasive mechanical ventilation
- Short descriptor
- Moisture exchanger
- Added
- January 1, 1999
- BETOS
- D1F
- Pricing indicator
- 37 — 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.
Ostomy, tracheostomy and urological supplies. Price subject to floors and ceilings.
Codes adjacent to A4483
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If A4483 is not quite right, the correct code is very often within a few positions of it.
- A4465Non-elastic binder for extremity
- A4466Garment, belt, sleeve or other covering, elastic or similar stretchable material, any type, eachterminated
- A4467Belt, strap, sleeve, garment, or covering, any type
- A4468Exsufflation belt, includes all supplies and accessories
- A4470Gravlee jet washer
- A4479Electronic transanal irrigation system, includes electronic pump, water reservoir, tubing, and accessories, without catheter, any type
- A4480Vabra aspirator
- A4481Tracheostoma filter, any type, any size, each
- A4490Surgical stockings above knee length, each
- A4495Surgical stockings thigh length, each
- A4500Surgical stockings below knee length, each
- A4510Surgical stockings full length, each
- A4520Incontinence garment, any type, (e.g., brief, diaper), each
- A4540Distal transcutaneous electrical nerve stimulator, stimulates peripheral nerves of the upper arm
- A4541Monthly supplies for use of device coded at e0733
- A4542Supplies and accessories for external upper limb tremor stimulator of the peripheral nerves of the wrist
Questions about A4483
What is HCPCS code A4483?
A4483 is a HCPCS Level II code for moisture exchanger, disposable, for use with invasive mechanical ventilation. It sits in the Transportation, Medical & Surgical Supplies, Administrative section.
Does Medicare cover A4483?
The CMS HCPCS file marks A4483 as "Special coverage instructions apply". There are published conditions attached to this code. Check the applicable coverage policy before billing it: the code being valid is not the same as the service being covered.
How is A4483 paid under the physician fee schedule?
A4483 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.