Skip to content

Physician Directory

Find a Doctor

Dr. Errol O. Grannum, MD


  • (956) 687-3937

Dr. Grannum's Overview

Dr. Errol O. Grannum graduated from the Yale University School of Medicine in 1993. He works in McAllen, TX and specializes in Ophthalmology. Dr. Grannum is affiliated with Doctors Hospital At Renaissance.

Dr. Grannum's Experience

Years in Practice: 22

Dr. Grannum's Specialties


Dr. Grannum's Education & Training

Medical School: Yale University School of Medicine; Graduated 1993

Dr. Grannum's Rating

Rate This Doctor

Overall Rating


  • Explains conditions & treatments
  • Takes time to answer my questions
  • Provides follow-up as needed
  • View All Ratings

Dr. Grannum's Accepted Insurance

  • Aetna Choice POS II
  • Aetna Managed Choice POS Open Access
  • Aetna Signature Administrators PPO
  • BCBS Blue Card PPO
  • BCBS TX Blue Advantage HMO
  • BCBS TX BlueChoice
  • CIGNA Open Access Plus
  • Great West PPO
  • Humana ChoiceCare Network PPO
  • View More

Dr. Grannum's Office Information & Appointments

Office Locations

Errol O Grannum MD

1910 S 1st St Ste 400
McAllen, TX 78503
(956) 687-3937


Office Hours and Information

Fax: (956) 687-3938

Practice Website: Not Available

Accepting New Patients: Yes

Medicare Accepted: Yes

Medicaid Accepted: Yes

Monday Closed
Tuesday 8:00 AM - 5:00 PM
Wednesday Closed
Thursday 8:00 AM - 5:00 PM
Friday 8:00 AM - 5:00 PM
Saturday Closed
Sunday Closed

Other Physicians in Dr. Grannum's Practice

  • Not Available

Dr. Grannum's Hospital Affiliations

Office Locations

Other Ophthalmologists Near McAllen, TX

View More Ophthalmologists