A0420 – Ambulance waiting time (als or bls), one half (1/2) hour increments

HCPCS Level II code · A codes: Transportation, Medical & Surgical Supplies, Miscellaneous & Experimental

Active code Not payable by Medicare

HCPCS codeA0420
Long description
Ambulance waiting time (als or bls), one half (1/2) hour increments
Short description
Ambulance waiting 1/2 hr
Pricing indicator
00 Not separately priced by Part B (bundled, not covered or Part A only)
Medicare coverage
I Not payable by Medicare
BETOS category
O1A Ambulance
Added
January 1, 1995
Last change
January 1, 2014 – No change

Frequently asked questions

What is HCPCS code A0420?

A0420 is a HCPCS Level II code for ambulance waiting time (als or bls), one half (1/2) hour increments.

Does Medicare cover A0420?

The HCPCS file lists coverage code I: Not payable by Medicare. Coverage and payment also depend on local coverage determinations and the patient’s plan.

Nearby A codes

Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.