Contact Us

HAP CareSource™ MI Health Link (Medicare-Medicaid Plan) strives to make it easy for you to work with us, whether online or over the phone.

For questions not addressed on our website, please call Provider Services at 1-833-230-2159.

You can reach us Monday through Friday from 8 a.m. to 6 p.m. Eastern Time (ET).

You can also do business with us online any time of the day or night. Visit our HAP CareSource Provider Portal to check claims, prior authorization status, member eligibility, coordination of benefits and more.

Key Contact Information

Below is a list of the plan’s phone numbers for general questions, prior authorizations, claim inquiries and more, as well as common fax numbers and addresses. Use this list as a guide to help you find the appropriate contact for your questions.

DepartmentPhoneAdditional Information

Provider Services



Medical Prior Authorization


Fax: 1-844-633-0399

Pharmacy Prior Authorization
ESI Coverage Review Department


Fax: 1-800-716-3231





HAP CareSource MI Health Link
Attn: Claims
P.O. Box 1186
Dayton, OH 45401-1186


Fax: 1-937-396-3492

HAP CareSource
Attn: Grievance & Appeals
P.O. Box 1025
Dayton, OH 45401-1025

HAP CareSource MI Health Link Office Closure Dates

Representatives are available by telephone Monday through Friday, except on the following holidays:

  • New Year’s Day
  • Martin Luther King Jr. Day
  • Memorial Day
  • Independence Day
  • Labor Day
  • Thanksgiving Day
  • Day after Thanksgiving
  • Christmas Eve
  • Christmas Day

Please note: If a holiday falls on a weekend date, HAP CareSource MI Health Link will be closed the following business day.