Mark Nguyen, PSY.D
NPI 1891044640 · Clinical Psychologist · San Francisco, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nguyen, PSY.D is a Clinical Psychologist provider in San Francisco, CA (NPI 1891044640).
Provider details
- NPI number
- 1891044640
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D
- Sex
- Male
- Sole proprietor
- No
- License
- PSY29174 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
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)
- 4211 Avalon BlvdLos Angeles, CA 90011-5622Phone: (323) 233-0425
Registry dates
- Enumerated
- 2012-09-06
- Last updated
- 2024-08-29
- Certified
- 2024-08-29
Frequently asked questions
- What is Mark Nguyen's NPI number?
- Mark Nguyen's National Provider Identifier (NPI) is 1891044640, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nguyen's specialty?
- Mark Nguyen is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mark Nguyen located?
- Mark Nguyen's practice location on file with NPPES is 1 Embarcadero Ctr Ste 1900, San Francisco, CA 94111-3723.
- What is Mark Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Mark Nguyen is (888) 663-6331.
- Does Mark Nguyen accept Medicare?
- Mark Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nguyen's NPI active?
- Yes — Mark Nguyen's NPI (1891044640) is active in the NPPES registry as of the last update on 2024-08-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.