OrganizationActive
Sean S. To, MD Inc
NPI 1831708254 · Internal Medicine Physician · Chino, CA
Sean S. To, MD Inc is a Internal Medicine Physician organization in Chino, CA (NPI 1831708254).
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
6 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
Frequently asked questions
- What is Sean S. To, MD Inc's NPI number?
- Sean S. To, MD Inc's National Provider Identifier (NPI) is 1831708254, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Sean S. To, MD Inc?
- Sean S. To, MD Inc is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sean S. To, MD Inc located?
- Sean S. To, MD Inc's practice location on file with NPPES is 5562 Philadelphia St Ste 201, Chino, CA 91710-2482.
- What is Sean S. To, MD Inc's phone number?
- The practice phone number listed in the NPPES registry for Sean S. To, MD Inc is (909) 988-1000.
- Who is the authorized official for Sean S. To, MD Inc?
- The authorized official listed on Sean S. To, MD Inc's NPPES record is Sean to, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Sean S. To, MD Inc's NPI active?
- Yes — Sean S. To, MD Inc's NPI (1831708254) is active in the NPPES registry as of the last update on 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.