Providers are encouraged to utilize the AIM Provider Portal for the most efficient method to submit requests. Online: Log in to the AIM ProviderPortalSM. Available 24/7/365. Phone: 1-800-859-5299. Monday – Friday, 6 a.m. to 6 p.m. CT, Saturdays, Sundays and Holidays, 9 a.m. to noon CT. Fax: 1-800-610-0050..