Theresa Win
NPI 1538401856 · Internal Medicine Physician · San Bernardino, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Theresa Win is a Internal Medicine Physician provider in San Bernardino, CA (NPI 1538401856).
Provider details
- NPI number
- 1538401856
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
13 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Mailing address
Additional practice locations (1)
- 9961 Sierra AveFontana, CA 92335-6720Phone: (909) 427-5000
Registry dates
- Enumerated
- 2013-03-25
- Last updated
- 2021-12-23
- Certified
- 2021-12-23
Frequently asked questions
- What is Theresa Win's NPI number?
- Theresa Win's National Provider Identifier (NPI) is 1538401856, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Theresa Win's specialty?
- Theresa Win is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Theresa Win located?
- Theresa Win's practice location on file with NPPES is 1805 Medical Center Dr, San Bernardino, CA 92411.
- What is Theresa Win's phone number?
- The practice phone number listed in the NPPES registry for Theresa Win is (909) 887-6333.
- Does Theresa Win accept Medicare?
- Theresa Win is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Theresa Win's NPI active?
- Yes — Theresa Win's NPI (1538401856) is active in the NPPES registry as of the last update on 2021-12-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.