Alexander F Castellanos MD Inc
NPI 1831260520 · Family Medicine Physician · Templeton, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander F Castellanos MD Inc is a Family Medicine Physician organization in Templeton, CA (NPI 1831260520).
Provider details
- NPI number
- 1831260520
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Alexander Castellanos, President(805) 434-1804
- License
- G37303 (CA)
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
Other names (DBA / former)
- Other name
- Alexander F Castellanos MD
- Other name
- Alexander F Castellanos MD
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2020-02-05
- Certified
- 2020-02-05
Frequently asked questions
- What is Alexander F Castellanos MD Inc's NPI number?
- Alexander F Castellanos MD Inc's National Provider Identifier (NPI) is 1831260520, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Alexander F Castellanos MD Inc?
- Alexander F Castellanos MD Inc is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander F Castellanos MD Inc located?
- Alexander F Castellanos MD Inc's practice location on file with NPPES is 699 S Main St, Templeton, CA 93465-5103.
- What is Alexander F Castellanos MD Inc's phone number?
- The practice phone number listed in the NPPES registry for Alexander F Castellanos MD Inc is (805) 434-1804.
- Does Alexander F Castellanos MD Inc accept Medicare?
- Alexander F Castellanos MD Inc 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 Alexander F Castellanos MD Inc?
- The authorized official listed on Alexander F Castellanos MD Inc's NPPES record is Alexander Castellanos, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Alexander F Castellanos MD Inc's NPI active?
- Yes — Alexander F Castellanos MD Inc's NPI (1831260520) is active in the NPPES registry as of the last update on 2020-02-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.