Errol O Grannum
NPI 1457377194 · Ophthalmology Physician · Mcallen, TX
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Errol O Grannum is a Ophthalmology Physician organization in Mcallen, TX (NPI 1457377194).
Provider details
- NPI number
- 1457377194
- Entity type
- Organization
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Errol Grannum, Owner(956) 687-3937
- License
- K5972 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-14
- Last updated
- 2020-08-22
Frequently asked questions
- What is Errol O Grannum's NPI number?
- Errol O Grannum's National Provider Identifier (NPI) is 1457377194, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Errol O Grannum?
- Errol O Grannum is classified in the NPPES registry as Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Errol O Grannum located?
- Errol O Grannum's practice location on file with NPPES is 1910 S 1st St, Mcallen, TX 78503-1255.
- What is Errol O Grannum's phone number?
- The practice phone number listed in the NPPES registry for Errol O Grannum is (956) 687-3937.
- Does Errol O Grannum accept Medicare?
- Errol O Grannum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Errol O Grannum?
- The authorized official listed on Errol O Grannum's NPPES record is Errol Grannum, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Errol O Grannum's NPI active?
- Yes — Errol O Grannum's NPI (1457377194) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.