Request For ID. MedImpact is a pharmacy benefit manager who works with your health plan to get you the medication you need. Our goal is to make it as easy as possible for you by working with your health plan and pharmacy to provide timely and essential information about your medicine, including how to take it correctly, potential side effects, any lower-cost drug options, and more.Jan 02, 2016 · (PCN): ASPROD1 CTRXMEDD Submitted group (Group): HAI01 HA0018 ID Number Must enter all 11 digits (no ID number changes) IMPORTANT INFORMATION REGARDING Health Alliance Medicare Help Desk phone numbers: 844-265-1876 For questions regarding this communication or other pharmacy related claims processing issues call: Our powerful suite of clinical and technology solutions gives plan sponsors command over their strategy, spend, and business results. Because we are delivery-model agnostic, we design and deploy our solutions to meet your needs, not ours.For 30 years, MedImpact has been lowering cost, improving care, and delivering better solutions for our clients. Today, we're the largest independent pharmacy benefit solutions company and we are investing millions of dollars in clinical programs, technology, operations, and analytics.