4.3
17 Ratings with 3 written Reviews
Summary
Dr. Errol Grannum is an ophthalmologist who specializes in comprehensive eye care and treatment of various vision-related conditions. He earned his medical degree from Yale University School of Medicine and brings 33 years of experience to his practice. Dr. Grannum is fluent in both English and Spanish.
Dr. Grannum practices in McAllen, Texas, and is affiliated with DHR Health Edinburg. His expertise includes treating diabetic retinopathy and glaucoma, conditions that can significantly impact vision if left untreated. He performs retinal imaging and comprehensive eye exams to help diagnose and monitor eye health. Patients have given him an average rating of 4.4 out of 5 on Vitals, reflecting their confidence in his care.
Dr. Grannum practices in McAllen, Texas, and is affiliated with DHR Health Edinburg. His expertise includes treating diabetic retinopathy and glaucoma, conditions that can significantly impact vision if left untreated. He performs retinal imaging and comprehensive eye exams to help diagnose and monitor eye health. Patients have given him an average rating of 4.4 out of 5 on Vitals, reflecting their confidence in his care.
Overview based on verified provider data
Quick Facts
- 33 years of experience
- 33 insurance plans accepted
- speaks English, Spanish
- Yale University School Of Medicine
- 3 written reviews
- 1 specialty
- 9 areas of expertise
- 1 hospital affiliation
- 1 office location
- Male
Patients’ Perspective
- Gave an accurate diagnosis
- Had a good bedside manner
- Spent time with me
Based on patient feedback. Read the reviews
Office Location
Compare with Similar Doctors
 |  |  | |
| Dr. Errol Olwyn Grannum, MD | Dr. Humair Khan, MD | Sandip Suresh, MD | Dr. Chevy Chu Lee, MD |
| Ophthalmology | Ophthalmology | Ophthalmology | Ophthalmology |
| Accepts New Patients | Accepts New Patients | ||
| 33 Years of Experience | 14 Years of Experience | 51 Years of Experience | |
| No Virtual Visit Option | Virtual Visit Available | Virtual Visit Available | No Virtual Visit Option |
| Speaks English, Spanish | Speaks English | Speaks English | Speaks English, Spanish |
| McAllen , TX | Webster , TX | Webster , TX | McAllen , TX |
| Med School: Yale University School Of Medicine | Med School: Baylor College of Medicine | Med School: University of Minnesota | Med School: University Of Texas Medical Branch At Galveston |
Current Profile | View Profile | View Profile | View Profile |
Insurance Plans Accepted by Dr. Errol Olwyn Grannum
Medical Specialties
Dr. Errol Olwyn Grannum has the following specialty
Specialty Expertise
Dr. Errol Olwyn Grannum has the following 9 areas of expertise
Certifications, License, & Education
33 Years Experience
Dr. Errol Olwyn Grannum holds an active medical license in the state of Texas.
Medical License
Medical Doctor with an active medical license in the state of Texas that expired in 2026.
Education & Training
Medical School
Graduated from Yale University School Of Medicine in 1993.
NPI Number
Dr. Grannum's NPI number is 1508897935.
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Frequently Asked Questions
- Is Dr. Errol Grannum accepting new patients?
- Dr. Errol Grannum has not indicated that they accept new patients. Contact their office through their Vitals profile to check for availability.
- How can I make an appointment with Dr. Errol Grannum?
- You can find contact information for Dr. Errol Grannum here on Vitals.
- Where is Dr. Errol Grannum's office located?
- Dr. Errol Grannum's office is located at 1910 S 1st St, McAllen, TX, 78503.
- Does Dr. Errol Grannum accept virtual/telehealth appointments?
- Dr. Errol Grannum has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
- What languages does Dr. Errol Grannum speak?
- Dr. Errol Grannum speaks English and Spanish.
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