Effective for dates of service April 1, 2026, and later, to accurately report certain travel distances, HCPCS code P9603 will be billed by calculating mileage to the 10th of a mile.

The per-mile travel allowance applies in 2 situations:

• The round-trip travel to 1 location is greater than 20 eligible miles for specimen collection from 1 or more patients (payment for the per-mile travel allowance amount, prorated by the number of patients for whom we pay a specimen collection fee)
• When travel is to more than 1 location, regardless of the number of miles traveled

For trips totaling up to 100 eligible miles, round mileage up to the nearest 10th of a mile. Use the decimal in the appropriate place (99.9).

For trips totaling 100 eligible miles or more, round mile up to the next whole number mile without using the decimal (report 998.5 miles as 999).

For trips totaling less than a mile, enter a 0 before the decimal (0.9).

Refer to MLN Matters Number MM14130.