TN modifier: how payers flag and pay rural trips on transportation claims
Overview
In HCPCS, TN flags a trip as rural or outside the provider's usual service area. CMS marks it not payable by Medicare, so every Medicaid program writes its own rule. Arizona requires it on trips that start beyond metro Phoenix and Tucson, South Dakota applies it to trips outside city limits at 150 percent of the established fee, and Alaska allows it for pickups outside Census urbanized areas.
On this page
TN is a two-character HCPCS modifier that tells a payer a trip was rural or started outside the provider’s usual service area. It changes nothing about the base code, and each program decides what it means and whether it pays extra. The wider question of how to make long rural trips pay is in rural NEMT, and the companion modifier for an extra rider is the TK modifier.
What the national code set says
The HCPCS descriptor is “Rural/outside providers’ customary service area,” with the short descriptor “Rural/out of service area.” CMS’s October 2026 file shows TN was added on April 1, 2002 and carries coverage code I. Medicare pays nothing for it, so TN means nothing on its own to a payer. The descriptor also joins two ideas with a slash, rural and outside the provider’s usual area, and each state picks the half it uses.
How each program defines the trip
Arizona, Alaska and South Dakota each answer the question differently.
- Arizona. Trips that begin inside the Phoenix and Tucson metropolitan areas are urban. All other trips are rural and must be billed with TN, according to chapter 14 of the fee-for-service manual, revised July 31, 2026. AHCCCS explains the rural label by poor roads, long drives to reach a member and few providers nearby.
- Alaska. A provider may use TN to mark a rural pickup, and Alaska defines rural as any area the Census Bureau has not delineated as urbanized. Where the patient is picked up decides whether urban or rural rates apply.
- South Dakota. The manual defines TN as a trip outside city limits. The July 1, 2026 modifier list sets its payment effect at 150 percent of the established fee, and the fee schedule applies it to the mini-bus and other transportation code, A0120.
Alaska’s waiver program uses TN on T2003 for a recipient trip of more than 20 miles. That is a distance line, not a rural line, and it shows why you read the payer’s own chart.
What TN pays in each program
TN pays more on some codes and the same on others. The rates below are the current fee schedules.
| Program and code | Without TN | With TN |
|---|---|---|
| Arizona A0120, mini-bus | $6.64 | $7.27 |
| Arizona A0100, taxi | $1.04 | $1.04 |
| South Dakota A0120, one way | $5.20 | $7.80 |
| Alaska A0130, wheelchair van | $35.00 | $35.00 plus $0.69 a mile |
| Alaska A0428, non-emergency BLS ambulance | $233.97 | $286.85 |
South Dakota applies the same 150 percent to the extra rider on a rural trip: A0120 with TN and TK pays $3.90. Arizona pays no more with TN on taxi (A0100), the volunteer and family mileage codes (A0080 and A0090), the A0160 mileage code or waiting time (T2007). The state still requires the modifier there, so the claim carries it even when the rate does not move. Arizona’s other rural rates are in the Arizona rate guide.
Before adding TN to a claim
- Find your code on the payer’s fee schedule and look for a TN line beside it, then read the payer’s manual for when TN is required. Where the schedule has no TN line and the manual does not call for it, leave TN off.
- Check what the payer measures. Arizona looks at where the trip starts, Alaska at the pickup point, and South Dakota at city limits.
- Look for extra requirements. In Alaska’s schedule the rural wheelchair van line is the only one that asks for both medical justification and service authorization.
- Keep the pickup address on the trip record so the claim shows where the trip began.
HealthRide keeps the pickup address, GPS-recorded miles and timestamps on every trip, so where each ride began is on the trip record.
Frequently asked questions
- Does Medicare pay for a claim with the TN modifier?
- No. CMS's October 2026 HCPCS file marks TN with coverage code I, the legend for items Medicare does not pay, and gives its add date as April 1, 2002. The modifier changes payment only where a Medicaid program or plan gives it an effect on its own fee schedule, so a trip pays more only when that payer's list says so.
- Is the TN modifier required or optional?
- It depends on the payer. Arizona says rural trips must be billed with TN, and South Dakota lists it among the modifiers that must go on a claim when they apply. Alaska says TN may be used to indicate a rural pickup, and it prices the rural line separately. Use the rule in your payer's manual, not the national descriptor.
- Does TN always pay more?
- No. In Arizona's rates effective October 1, 2026, taxi (A0100) pays $1.04 with or without TN, and volunteer mileage (A0080) pays $0.44 either way, while the mini-bus code A0120 goes from $6.64 to $7.27. South Dakota pays 150 percent. Alaska pays a flat $35 for a wheelchair van and $35 plus $0.69 a mile with TN.
- Does TN always mean rural?
- Not in every program. Alaska's waiver rate chart of August 4, 2026 uses T2003 with TN for a recipient trip of more than 20 miles, at $47.42 against $23.72 for a trip up to 20 miles. South Dakota's manual describes TN as a trip outside city limits, not as a rural area.
