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

Sean S. to, MD Inc

Organization Internal Medicine Physician · NPI 1831708254

Sean S. to, MD Inc is an Internal Medicine Physician in Chino, California. Registered with an NPI since 2020.

In the registry since
2020
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

5562 Philadelphia St Ste 201
Chino, CA 91710-2482
Phone: (909) 988-1000
Fax: (909) 988-1001
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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

Record details

NPI number1831708254
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Sean To — President · (626) 652-8871
Other names Sean S. To, Md; Sean S. To, Md Inc
NPI enumeratedJuly 31, 2020
Last updated in NPPESJuly 31, 2020
Certification dateJuly 31, 2020
Mailing address1317 S Diamond Bar Blvd Unit 4462, Diamond Bar, CA 91765-5620

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