DR. MARK PHUOC NGUYEN PSY.D
NPI 1891044640
Psychologist - Clinical in San Francisco, CA
About Dr. Mark Phuoc Nguyen Psy.d NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK PHUOC NGUYEN PSY.D (NPI 1891044640) is an individual clinical provider in San Francisco, California, licensed in California (PSY29174) and active in the NPI registry since September 2012. He is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Mark Phuoc Nguyen Psy.d is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Mark Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94111
- Reassigned Medicare billing, California enrollment
- 291 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94111 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
SAN FRANCISCO, CA 94111
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Nguyen's NPI number?
The NPI number for Mark Nguyen is 1891044640. It was assigned to this individual provider in the NPPES registry on September 6, 2012.
Where is Mark Nguyen located?
Mark Nguyen practices at 1 Embarcadero Ctr Ste 1900, San Francisco, CA 94111. The listed phone number is (888) 663-6331.
What is Mark Nguyen's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Mark Nguyen enrolled in Medicare?
Yes. Mark Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Mark Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Nguyen reassigns Medicare benefits to One Medical Group, Inc. (San Francisco, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mark Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Mark Nguyen was last updated on August 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Mark Phuoc Nguyen, PSY.D · NPI 1891044640
Clinical provider in San Francisco, California. Individual provider, active in the CMS NPPES registry since September 6, 2012.
## Identity
- **NPI:** 1891044640 (Entity type: Individual)
- **Enumerated:** September 6, 2012
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** PSY29174 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 EMBARCADERO CTR STE 1900, San Francisco, CA 94111-3723
- **Phone:** (888) 663-6331
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** One Medical Group, Inc. (NPI 1467781641, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** August 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1891044640) · Data from the CMS NPPES public registry.