Indiana Code Title 12. Human Services § 12-16-6.5-1.2

Sec. 1.2. (a) If the division determines that an item or service identified in a claim:

the affected person or provider may appeal to the division not later than ninety (90) days after the mailing of the notice of that determination to the affected person or provider to the last known address of the person or provider.

(b) If the division determines that an item or service identified in a claim:

but the affected provider disagrees with the amount of the claim calculated by the division under IC 12-16-5.5-1.2(b), the affected provider may appeal the calculation to the division not later than ninety (90) days after the mailing of the notice of that calculation to the affected provider to the last known address of the provider.