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

Dr. Sean Grammy, DO

Individual provider Emergency Medicine Physician · NPI 1982832127

Dr. Sean Grammy, DO is an Emergency Medicine Physician in Antioch, California. Licensed in California. Registered with an NPI since 2009.

Licensed in
CA
In the registry since
2009
Specialties on file
2
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

3901 Lone Tree Way
Antioch, CA 94509-6200
Phone: (925) 779-7200
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 20A13122 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 20A13122 (CA)

Record details

NPI number1982832127
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 25, 2009
Last updated in NPPESJuly 28, 2014
Mailing address1000 Harness Dr, 59, San Ramon, CA 94583-2252

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