You can telephone Humana New Member Services at: 1-888-839-7316 or Humana Customer Service at: 1-800-457-4708. or Humana Enrollment & Information Center at: 1-800-833-6578 or Humana Billing Department at: 1-800-992-2551 If you wish to review your Medicare Part D plan information and status securely online, you may want to access your own personalized Member website provided by Humana - called MyHumana.