Khoa Nguyen, M.D.
NPI 1386962421 · Internal Medicine Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Khoa Nguyen, M.D. is a Internal Medicine Physician provider in Castro Valley, CA (NPI 1386962421).
Provider details
- NPI number
- 1386962421
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A111239 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 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
Mailing address
Additional practice locations (1)
- 17095 Main StHesperia, CA 92345-6004Phone: (760) 241-6666Fax: (760) 947-5619
Registry dates
- Enumerated
- 2010-05-13
- Last updated
- 2020-10-19
- Certified
- 2020-10-19
Frequently asked questions
- What is Khoa Nguyen's NPI number?
- Khoa Nguyen's National Provider Identifier (NPI) is 1386962421, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Khoa Nguyen's specialty?
- Khoa Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Khoa Nguyen located?
- Khoa Nguyen's practice location on file with NPPES is 20103 Lake Chabot Rd, Castro Valley, CA 94546-5305.
- What is Khoa Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Khoa Nguyen is (510) 727-3256.
- Does Khoa Nguyen accept Medicare?
- Khoa Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Khoa Nguyen's NPI active?
- Yes — Khoa Nguyen's NPI (1386962421) is active in the NPPES registry as of the last update on 2020-10-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.