Andy Nguyen, MD
NPI 1659450310 · Internal Medicine Physician · Livermore, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andy Nguyen, MD is a Internal Medicine Physician provider in Livermore, CA (NPI 1659450310).
Provider details
- NPI number
- 1659450310
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A71077 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$14 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-03
- Last updated
- 2007-07-08
Frequently asked questions
- What is Andy Nguyen's NPI number?
- Andy Nguyen's National Provider Identifier (NPI) is 1659450310, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andy Nguyen's specialty?
- Andy Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Andy Nguyen located?
- Andy Nguyen's practice location on file with NPPES is 3000 Las Positas Rd, Livermore, CA 94551-9627.
- What is Andy Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Andy Nguyen is (925) 243-2600.
- Does Andy Nguyen accept Medicare?
- Andy Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andy Nguyen's NPI active?
- Yes — Andy Nguyen's NPI (1659450310) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.