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

John Massaro, DO

Individual provider Internal Medicine Physician · NPI 1588665293

John Massaro, DO is an Internal Medicine Physician in San Luis Obispo, California. Licensed in California. Registered with an NPI since 2005.

Licensed in
CA
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

975 Osos St
San Luis Obispo, CA 93401-3212
Phone: (805) 549-0677
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20A7971 (CA)

Record details

NPI number1588665293
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 3, 2005
Last updated in NPPESNovember 30, 2011

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