WEBMar 8, 2022 · Your appeal must: Be in writing and signed, State specifically why you disagree, Include a copy of the claim decision, and; Be postmarked or received by Express Scripts within a deadline of 90 calendar days from the date of the decision to: Express Scripts, Inc. P.O. Box 60903 Phoenix, AZ 85082-0903. You may submit more documentation to support ...