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Gregory Castillo, MD.
NPI 1700839917 · Family Medicine Physician · Downey, CA
Gregory Castillo, MD. is a Family Medicine Physician provider in Downey, CA (NPI 1700839917).
Provider details
- NPI number
- 1700839917
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD.
- Sex
- Male
- Sole proprietor
- No
- License
- A53294 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
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
9040 Telegraph Rd Ste 102
Downey, CA 90240-2395
Phone: (562) 861-0954
Fax: (562) 231-1906
Street-level locationGet directions
Mailing address
Po Box 275
Artesia, CA 90702-0275
Registry dates
- Enumerated
- 2006-05-18
- Last updated
- 2023-03-07
- Certified
- 2020-10-13
Frequently asked questions
- What is Gregory Castillo's NPI number?
- Gregory Castillo's National Provider Identifier (NPI) is 1700839917, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Castillo's specialty?
- Gregory Castillo is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Castillo located?
- Gregory Castillo's practice location on file with NPPES is 9040 Telegraph Rd Ste 102, Downey, CA 90240-2395.
- What is Gregory Castillo's phone number?
- The practice phone number listed in the NPPES registry for Gregory Castillo is (562) 861-0954.
- Is Gregory Castillo's NPI active?
- Yes — Gregory Castillo's NPI (1700839917) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.