Efrem Castillo, M.D.
NPI 1003888785 · Family Medicine Physician · San Antonio, TX
Efrem Castillo, M.D. is a Family Medicine Physician provider in San Antonio, TX (NPI 1003888785).
Provider details
- NPI number
- 1003888785
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- J4029 (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
20 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
- 2006-02-06
- Last updated
- 2012-07-19
Frequently asked questions
- What is Efrem Castillo's NPI number?
- Efrem Castillo's National Provider Identifier (NPI) is 1003888785, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Efrem Castillo's specialty?
- Efrem Castillo is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Efrem Castillo located?
- Efrem Castillo's practice location on file with NPPES is 8637 Fredericksburg Rd, San Antonio, TX 78240-1219.
- What is Efrem Castillo's phone number?
- The practice phone number listed in the NPPES registry for Efrem Castillo is (210) 877-7669.
- Is Efrem Castillo's NPI active?
- Yes — Efrem Castillo's NPI (1003888785) is active in the NPPES registry as of the last update on 2012-07-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.