STEFAN NGUYEN
NPI 1952842221
Hospitalist in Los Angeles, CA
About Stefan Nguyen NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
STEFAN NGUYEN (NPI 1952842221) is an individual hospitalist provider in Los Angeles, California, licensed in California (A157405) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS and is a graduate of Ohio State University College Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses
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
Stefan Nguyen 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 Reassignments
4Medicare enrollment records show Stefan Nguyen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- 2,445 clinicians in this Medicare group
Los Angeles, CA 90041
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Encinitas, CA 92024
- Reassigned Medicare billing, California enrollment
- 70 clinicians in this Medicare group
Encinitas, CA 92024
- Reassigned Medicare billing, California enrollment
- 92 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90033 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
LOS ANGELES, CA 90033
LOS ANGELES, CA 90033
LOS ANGELES, CA 90033
LOS ANGELES, CA 90033
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 Stefan Nguyen's NPI number?
The NPI number for Stefan Nguyen is 1952842221. It was assigned to this individual provider in the NPPES registry on March 20, 2017.
Where is Stefan Nguyen located?
Stefan Nguyen practices at 1500 San Pablo St, Los Angeles, CA 90033. The listed phone number is (323) 442-5100.
What is Stefan Nguyen's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Stefan Nguyen enrolled in Medicare?
Yes. Stefan 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 organizations bill Medicare for Stefan Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stefan Nguyen reassigns Medicare benefits to 4 organizations: Usc Care Medical Group, Inc (Los Angeles, CA), Southern California Permanente Medical Group (Los Angeles, CA), Enlightened Healthcare Alliance Medical Corporation (Encinitas, CA) and North County Inpatient Medical Alliance, A Medical Group, Inc (Encinitas, CA). Each 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 Stefan 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 Stefan Nguyen was last updated on October 25, 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.
# Stefan Nguyen · NPI 1952842221
Hospitalist physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since March 20, 2017.
## Identity
- **NPI:** 1952842221 (Entity type: Individual)
- **Enumerated:** March 20, 2017
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A157405 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1500 SAN PABLO ST, Los Angeles, CA 90033-5313
- **Phone:** (323) 442-5100
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Usc Care Medical Group, Inc (NPI 1902846306, Los Angeles, CA); Southern California Permanente Medical Group (NPI 1013409044, Los Angeles, CA); Enlightened Healthcare Alliance Medical Corporation (NPI 1710458245, Encinitas, CA); North County Inpatient Medical Alliance, A Medical Group, Inc (NPI 1932108115, Encinitas, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Ohio State University College Of Medicine, class of 2017
## Record status
- **NPPES last updated:** October 25, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1952842221) · Data from the CMS NPPES public registry.