Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Alexander F Castellanos, MD

Individual provider Family Medicine Physician · NPI 1770771511

Alexander F Castellanos, MD is a Family Practice in Templeton, California. Graduated from Stanford University School of Medicine in 1977, 49 years ago. Practices with David B. Hammer, a 116-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
49
Trained at
Stanford University School of Medicine
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

699 S Main St
Templeton, CA 93465-5103
Phone: (805) 434-1804
Fax: (805) 434-1855
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G37303 (CA)

Record details

NPI number1770771511
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 5, 2007
Last updated in NPPESDecember 26, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 1977 (49 years in practice)
Group practice David B. Hammer — 116 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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