> > > Dr. Errol Grannum, MD
Dr. Errol Olwyn Nathaniel Grannum MD is a male Ophthalmologist, has 17 years of experience and practices in Ophthalmology.
Dr. Errol Grannum has 3 office locations.
Valley Retina Institute Pa
1910 S 1st St
Ste 400
McAllen, TX 78503

Phone Number
Locations and availability (3)
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

  • He has special expertise in 1 area:
  • Glaucoma

Education & Awards

Dr. Grannum graduated from Yale University, New Haven.


Dr. Grannum has 8 hospital affiliations:

  • Valley Baptist Medical Center-Brownsville 
  • Doctors Hospital Renaissance - Edinburg 

Accepted Insurance Plans

Dr. Grannum accepts these health insurances in at least one office:

  • Great-West Healthcare - 2 plans
  • Unicare - 11 plans
  • Blue Cross Blue Shield of Texas - 1 plan
  • Superior Health Plan - 2 plans
  • Scott and White Health Plan - 2 plans
  • Humana - 2 plans
  • Medicare - 1 plan
  • Cigna - 2 plans
  • USA H & W Network - 1 plan


  • Spanish

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Additional Information
Where does Dr. Errol O. Grannum practice?
Dr. Errol Grannum practices Ophthalmology near McAllen, TX.
Additional practice locations include: Harlingen, TX.
See McAllen Ophthalmologists.