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    Dr. Errol O. Grannum, MD


    • (956) 687-3937

    Dr. Grannum's Overview

    Dr. 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: 23

    Dr. Grannum's Specialties


    Dr. Grannum's Education & Training

    Medical School: Yale University School of Medicine; Graduated 1993

    Dr. Grannum's Rating

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    Overall Rating


    • Explains conditions & treatments
    • Takes time to answer my questions
    • Provides follow-up as needed
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    Dr. Grannum's Accepted Insurance

    Please verify insurance information directly with your doctor's office as it may change frequently.

    • Aetna Choice POS II
    • Aetna Managed Choice POS
    • 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
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    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

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