NPI age
19 years
Enumerated 2006-07-14
● Active Type 2 · Organization
Errol O Grannum
Errol O Grannum is 1 of 2155 ophthalmology organizations in Texas.
Primary specialty
Ophthalmology
Practice locations
1
0 secondary on file
Status
Active
No deactivations on record
Authorized official
Grannum
Owner
Last NPPES update
2020-08-22
Source: monthly bulk 2026-05
How this organization compares
Across 2155 active ophthalmology providers in Texas.
NPI age
19 years
≈ at median (19 yr)
Practice locations
1
0 secondary on file
Subspecialties
0
NPI lifetime · 2006 → 2026
2006-07Enumerated in NPPES
2006
2026
Where they practice
Primary practice location
1910 S 1st St, Suite 400
McAllen, TX 785031255
Mailing address
1910 S 1st St, Suite 400
McAllen, TX 785031255
Authorized official
Errol Olwyn Grannum, MD
Owner
📞 9566873937
Individual providers at this organization
3 individual providers on file at this primary practice address.
- Roberto Arguello, M.D. Ophthalmology NPI 1538130521
- Errol Grannum, MD Ophthalmology NPI 1508897935
- Ruy Mireles Quintanilla Specialist NPI 1467458422
Specialties
-
Ophthalmology PrimaryAn ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual...
Practice context
Multi-provider organization. 3 individual providers on file at this primary address.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
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- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.