Efrem L. Castillo, M.D.
Family Medicine Physician · San Antonio, TX
Efrem L. Castillo, M.D. is a family medicine physician with a practice address in San Antonio, Texas, and NPI 1003888785, issued on Feb 6, 2006. Check the license (Texas J4029, as entered in NPPES) on the Texas Medical Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Efrem L. Castillo
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- J4029 TX
Self-reported in NPPES; status is on the state search - Practice location
- 8637 Fredericksburg RD, San Antonio, TX 78240
- Phone
- (210) 877-7669
- Enumerated
- Feb 6, 2006
- Record last updated
- Jul 19, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (210) 617-4075
- Entity
- Type 1 · individual
Also registered at 8637 Fredericksburg RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vanessa Lauffer, PHARMDPharmacist1457752735
- Bao NguyenChiropractor1780717132
- Paul Nugent, MDFamily Medicine Physician1821095506
- George Rapier, MDInternal Medicine Physician1801893581
- Ronald Wool, M.D.Gastroenterology Physician1205814316
Verify Efrem L. Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license J4029Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
809 family medicine physician records list a practice address in San Antonio
They are 809 of the 37,749 NPPES records with a practice address in San Antonio, and 11,119 family medicine physician records in Texas. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 809 in San Antonio → All 11,119 in Texas → Every provider in San Antonio →
Other family medicine physician records in Texas
- Srinivasa Aaluri, MDEl Paso, TX1265566509
- Maira Aamir, MDShenandoah, TX1932660859
- Fakhrudin Aaseemah Mohamed, M.DAllen, TX1952782518
- So Abad, MDWichita Falls, TX1184624694
- Yoseph AbadiRichardson, TX1700742640
- Marcus Abadie, M.D.Athens, TX1104821107
- Montserrat Abadie Sole, M.D.Fort Worth, TX1245437078
- Sarah Abang-Hayes, M.D.San Antonio, TX1326244724
- Ahmad Abazid, M.DRichardson, TX1013238401
- Syed Abbas, M.D.Houston, TX1821267477
Common questions
What is Efrem L. Castillo, M.D.'s NPI number?
Efrem L. Castillo, M.D.'s National Provider Identifier (NPI) is 1003888785, issued on Feb 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Efrem L. Castillo, M.D. located?
The NPPES record lists a practice address at 8637 Fredericksburg RD, San Antonio, TX, 78240. Phone: (210) 877-7669. Providers update this record themselves, so call before visiting.
How can I verify Efrem L. Castillo, M.D.'s license?
NPPES lists Texas license number J4029, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.