A0100 Billing Code: Non-Emergency Taxi Trips, Units, Modifiers, and State Rates

What A0100 means

CMS lists A0100 in the national HCPCS code set as “Non-emergency transportation; taxi.” The October 2026 quarterly file shows the code has been in the set since January 1, 1982. It carries coverage code I, which means Medicare does not pay it.

The description names no unit and no mileage. Each Medicaid program, health plan, and broker fills in four things:

Part of the claim	How A0100 varies
Who may bill it	Enrolled taxi providers in Indiana, licensed taxis in Illinois, community transportation providers in South Dakota, sedan and taxi providers in Oregon
What one unit is	A one-way trip, a trip length band, or a base charge
Mileage	Included in the trip amount, or billed on a second line with A0425 or S0215
Modifiers	Set by the state, such as UA, UB, and UC for trip length in Indiana

A0100 is for ambulatory riders, who need neither a wheelchair van nor a stretcher. New York’s policy manual describes taxi service as curb-to-curb. A rider who travels seated in a wheelchair is an A0130 trip.

Which states pay A0100 and how much

These are fee-for-service maximums from each state’s own schedule. Brokers and health plans pay their own contract rates.

Program	How A0100 is paid	Rate	Effective
Arizona AHCCCS	No unit shown, same amount urban and rural	$1.04	October 1, 2026
Illinois	Taxi base, plus miles on A0425	$2.66 base and $0.91 a mile, or $6.40 and $1.61 in Madison and St. Clair counties	January 1, 2026
South Dakota	Per one-way trip	$5.20, and $2.60 with TK for each added rider	July 1, 2026
Indiana	Per trip by length, nonregulated taxis, no mileage	$7.63 for 0 to 5 miles (UA), $12.71 for 6 to 10 miles (UB), $19.08 for 11 miles or more (UC)	January 1, 2026
North Dakota	One base per way, with a separate S0215 mileage line on the schedule	$27.06 base, S0215 $0.72 a mile	July 1, 2026

Two notes on the table:

• Arizona. The schedule lists A0100 at $1.04 without saying whether that is per trip or per mile, so ask AHCCCS before you bill it. Chapter 14 (revised July 31, 2026) puts the trips on line 1 of every NEMT claim and the loaded miles on line 2. The schedule’s general mileage code, S0215, pays $1.28, or $1.63 with TN. Transportation network companies have a separate A0100 rate of $0.63, used only on the health plans’ capped fee schedule.
• North Dakota. Its July 1, 2025 schedule allowed one base rate per way and described the S0215 line as miles greater than 15. Confirm with the state how the current rates apply before you bill.

New York bills taxi and livery rides with A0100 at fees set county by county, on the fee schedule dated April 5, 2026. Oregon lists A0100 as its sedan and taxi code in the provider guide last updated December 22, 2025.

How A0100 differs from sedan and ambulatory trip codes

The same walk-on ride can carry four different codes depending on the state and your provider type. Pick the code that matches how you are enrolled, not the car you drive.

Code	Official description	Where it is used for walk-on rides
A0100	Non-emergency transportation; taxi	Taxi providers in Indiana, Illinois, North Dakota, and South Dakota. Oregon’s code for a sedan or taxi.
A0120	Non-emergency transportation: mini-bus, mountain area transports, or other transportation systems	An Illinois service car, a passenger vehicle for a rider who needs no ambulance or medicar, at $20.00 base as of January 1, 2026. North Dakota minibuses, at $18.05 as of July 1, 2026.
T2003	Non-emergency transportation; encounter/trip	Indiana commercial ambulatory service, at $12.71 per trip as of January 1, 2026. Every Texas demand response ride, taxis included.
S0215	Non-emergency transportation; mileage, per mile	South Dakota’s community transportation mileage line. North Dakota and Arizona also list it.

In Illinois, the difference is the license. The handbook (March 11, 2024) enrolls taxis licensed by the Secretary of State and, where applicable, local regulators. A service car is licensed as livery or public transportation. See livery vehicle.

In Indiana, the difference is the specialty you enroll under. Taxi providers enroll as specialty 263. Commercial carriers for walk-on riders enroll as specialty 264 and bill T2003 with separate base, mileage, and wait time. See add NEMT to a taxi business.

Indiana: taxi codes by trip length

Indiana’s Transportation Services module (version 6.1, published August 19, 2025) pays taxis in two ways:

1. Regulated taxis. Where local ordinance sets the fare, you bill the metered or zoned rate, and Indiana pays up to the maximum fee.
2. Nonregulated taxis. Indiana pays the lower of your charge or the maximum fee for the trip’s length, using UA, UB, or UC.

Indiana does not pay taxi mileage on top of the trip amount. You still record the distance on the driver’s ticket, by odometer or mapping software, to support the amount you bill.

Rider	0 to 5 miles	6 to 10 miles	11 miles or more
First member	A0100 UA, $7.63	A0100 UB, $12.71	A0100 UC, $19.08
Each added member on the same trip	A0100 UA TT, $3.81	A0100 UB TT, $6.36	A0100 UC TT, $9.54
Accompanying adult or attendant	A0100 UA TK, $3.81	A0100 UB TK, $6.36	A0100 UC TK, $9.54

Rates are from the fee schedule effective January 1, 2026. A member younger than 16 must travel with an adult, such as a parent, and that adult signs the driver’s ticket. Indiana also wants origin and destination modifiers on the base line. See the TK modifier and origin and destination modifiers.

Example. A member rides 8 miles to a clinic and 8 miles home on the same day, with a parent. Both legs fall in the 6 to 10 mile band, so they go on one line with 2 units.

Line	Code	Units	Amount
1	A0100 UB, plus the origin and destination pair	2	2 x $12.71 = $25.42
2	A0100 UB TK, plus the pair	2	2 x $6.36 = $12.72
Total			$38.14

Most Indiana fee-for-service rides are brokered by Verida, which bases its rates on the state fee schedule and may negotiate its own. See the Verida broker guide.

Illinois: a taxi base plus miles

Illinois pays taxis at the community rate set by local government. Where no local rate exists, it pays up to the department’s maximum. On the January 1, 2026 schedule, that maximum is $2.66 per trip plus $0.91 per loaded mile on A0425 in most counties, and $6.40 plus $1.61 a mile in Madison and St. Clair counties.

A downstate taxi trip of 12 loaded miles pays up to $2.66 + (12 x $0.91) = $13.58.

Before you drive, Illinois requires:

• Prior approval for every non-emergency ride.
• Safety training for every taxi driver and employee attendant, through a department-approved program, renewed every three years.
• A fingerprint-based background check at enrollment, which private autos and government-run vendors skip.

See the Illinois state guide.

North Dakota and South Dakota

North Dakota. Taxi trips need the SFN 1507 authorization from the human services zone or tribal office before the ride, and the office may issue a taxi voucher. Rides are allowed only between the member’s home, school, or work and the appointment. You file the SFN 296 trip ticket with A0100 claims. Since June 11, 2026, North Dakota Medicaid has frozen new enrollments of NEMT agencies statewide for 6 months, with possible 6-month extensions. Providers already enrolled are not affected. See enrollment moratorium and the North Dakota state guide.

South Dakota. A0100 falls under community transportation. The manual, updated August 2026, says a community transportation provider must be a governmental entity, an enrolled secure medical transportation provider, or a registered nonprofit. Miles on S0215 pay $1.04 only outside city limits on trips of 21 miles or more one way. South Dakota pays up to 4 one-way trips per member per day and marks the extra trips with modifier 59. See the South Dakota state guide.

How to bill A0100 without denials

1. Confirm the code for your enrollment. Check that A0100 is on your state’s schedule for your provider type. Some programs want A0120 or T2003 instead. See NEMT billing codes.
2. Get the authorization first. Use the trip number, voucher, or prior approval your payer issues.
3. Set the unit the state’s way. A one-way trip, a length band, or a base plus miles.
4. Record the miles even when they are not paid. Indiana requires odometer readings or mapping software on every taxi ticket.
5. Add the driver and vehicle numbers where required. Since May 24, 2018, New York denies taxi and livery claims without the driver’s license number and the vehicle’s plate number.
6. Bill added riders the state’s way. Indiana uses TT, South Dakota uses TK, and Oregon wants a separate claim for each added client.