OrganizationActive
Sean S. To, MD Inc
NPI 1831708254 · Internal Medicine Physician · Chino, CA
Provider details
- NPI number
- 1831708254
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Sean to, President(626) 652-8871
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Established profile(64/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 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
5562 Philadelphia St Ste 201
Chino, CA 91710-2482
Phone: (909) 988-1000
Fax: (909) 988-1001
Street-level locationGet directions
Mailing address
1317 S Diamond Bar Blvd Unit 4462
Diamond Bar, CA 91765-5620
Other names (DBA / former)
- Former legal business name
- Sean S. To, MD
- Former legal business name
- Sean S. To, MD Inc
Registry dates
- Enumerated
- 2020-07-31
- Last updated
- 2020-07-31
- Certified
- 2020-07-31
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.