OrganizationActive
Ythanh Nguyen M.D. Inc
NPI 1164965018 · Internal Medicine Physician · Upland, CA
Provider details
- NPI number
- 1164965018
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Ythanh Nguyen, President(909) 239-6109
- License
- A84989 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(75/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% 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
999 San Bernardino Rd
Upland, CA 91786-4920
Phone: (909) 985-2811
Street-level locationGet directions
Mailing address
154-A W. Foothill Blvd. Box 354
Upland, CA 91786
Additional practice locations (1)
- 8235 Rochester AveRancho Cucamonga, CA 91730-0718Phone: (909) 484-4900Fax: (909) 781-2949
Registry dates
- Enumerated
- 2016-11-27
- Last updated
- 2026-02-01
- Certified
- 2026-02-01
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.