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| Medicare Region | Contact | Website | Address |
| A | HealthNow NY 1-800-633-4227 | www.umd.nycpic.com | P O Box 1246 Wilkes-Barre, PA 18703 |
| B | AdminiStar Federal, Inc 1-800-633-4227 | www.administar.com | P O Box 7031 Indianapolis, IN 46207 |
| C | Palmetto GBA 1-800-633-4227 | www.PalmettoGBA.com | DMERC Region C P O Box 100141 Columbia, SC 29202-3141 |
| D | CIGNA 1-800-633-4227 | www.cignamedicare.com | P O Box 690 Nashville, TN 37202 |