Gregory Castillo, MD.
Family Medicine Physician · Downey, CA
Gregory Castillo, MD. is a family medicine physician with a practice address in Downey, California, and NPI 1700839917, issued on May 18, 2006. Check the license (California A53294, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Gregory Castillo
- Credential
- MD.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A53294 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9040 Telegraph RD Ste 102, Downey, CA 90240
- Phone
- (562) 861-0954
- Enumerated
- May 18, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (562) 231-1906
- Medicaid ID
- 00A532940 CA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 9040 Telegraph RD Ste 102
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allen Streelman, D.O.Family Medicine Physician1255379582
Verify Gregory Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A53294Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Gregory Castillo among 17,133 family medicine physician records in California
Gregory Castillo, MD. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileNo · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2023 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
65 family medicine physician records list a practice address in Downey
They are 65 of the 3,607 NPPES records with a practice address in Downey, and 17,133 family medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,133 in California → Every provider in Downey → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Gustavo Estrella, MDDowney, CA 902401538208236
- Cristina Garcia, MDDowney, CA 902401326391004
- Marshall Kahn, M.D.Downey, CA 902401699912451
- Susan Kawakami, D.O.Downey, CA 902401740212851
- Marilou Lucero, M.D.Downey, CA 902401861523052
- Anar Patel-Joshi, MDDowney, CA 902401710509500
- Enrique Robles, M.D.Downey, CA 902401932155157
- Martha Rodriguez, M.D.Downey, CA 902401912993973
Common questions
What is Gregory Castillo, MD.'s NPI number?
Gregory Castillo, MD.'s National Provider Identifier (NPI) is 1700839917, issued on May 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Castillo, MD. located?
The NPPES record lists a practice address at 9040 Telegraph RD Ste 102, Downey, CA, 90240. Phone: (562) 861-0954. Providers update this record themselves, so call before visiting.
How can I verify Gregory Castillo, MD.'s license?
NPPES lists California license number A53294, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.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.