A4620 — Variable concentration mask
A4620 is a HCPCS Level II code for variable concentration mask. 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 A4620 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: Data
- DME supplier
- 0 — never payable MAI 3 — Date of Service Edit: Clinical · Published Contractor 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 A4620
- Long descriptor
- Variable concentration mask
- Short descriptor
- Variable concentration mask
- Added
- January 1, 1990
- BETOS
- D1C
- Pricing indicator
- 00 — Not priced by Part B
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.
Service not separately priced by Part B — not covered, bundled into another service, or used by Part A only.
Codes adjacent to A4620
HCPCS has no hierarchy — related items simply sit next to each other in the numbering. If A4620 is not quite right, the correct code is very often within a few positions of it.
- A4612Battery cables; replacement for patient-owned ventilator
- A4613Battery charger; replacement for patient-owned ventilator
- A4614Peak expiratory flow rate meter, hand held
- A4615Cannula, nasal
- A4616Tubing (oxygen), per foot
- A4617Mouth piece
- A4618Breathing circuits
- A4619Face tent
- A4623Tracheostomy, inner cannula
- A4624Tracheal suction catheter, any type other than closed system, each
- A4625Tracheostomy care kit for new tracheostomy
- A4626Tracheostomy cleaning brush, each
- A4627Spacer, bag or reservoir, with or without mask, for use with metered dose inhaler
- A4628Oral and/or oropharyngeal suction catheter, each
- A4629Tracheostomy care kit for established tracheostomy
- A4630Replacement batteries, medically necessary, transcutaneous electrical stimulator, owned by patient
Questions about A4620
What is HCPCS code A4620?
A4620 is a HCPCS Level II code for variable concentration mask. It sits in the Transportation, Medical & Surgical Supplies, Administrative section.
Does Medicare cover A4620?
The CMS HCPCS file marks A4620 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 A4620 paid under the physician fee schedule?
A4620 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.