Portal Login HCA Gulf Coast. You did not set a valid value for 'Custom Variable 1' for Patient Portal syndicated content. Acceptable values are: HCA Gulf Coast Division 3737 Buffalo Speedway Suite 1400 Houston, TX 77098 Telephone: (713) 852-1500. About HCA Gulf Coast Mission and Values Phone Directory. Hcagulfcoast.com DA: 16 PA: 16 MOZ Rank: 33..