THIEN-KIM NGUYEN CO DO
NPI 1033732953
Internal Medicine - Nephrology in Los Alamitos, CA
About Thien-kim Nguyen Co Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
THIEN-KIM NGUYEN CO DO (NPI 1033732953) is an individual nephrology provider in Los Alamitos, California, licensed in California (20A20255) and active in the NPI registry since May 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 3
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
Thien-kim Nguyen Co Do 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
2Medicare enrollment records show Thien-kim Co reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Alamitos, CA 90720
- Reassigned Medicare billing, California enrollment
- 279 clinicians in this Medicare group
Paramount, CA 90723
- Reassigned Medicare billing, California enrollment
- 34 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 90720 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 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LOS ALAMITOS, CA 90720
LOS ALAMITOS, CA 90720
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 Thien-kim Co's NPI number?
The NPI number for Thien-kim Co is 1033732953. It was assigned to this individual provider in the NPPES registry on May 27, 2020.
Where is Thien-kim Co located?
Thien-kim Co practices at 3851 Katella Ave Ste 325, Los Alamitos, CA 90720. The listed phone number is (562) 286-6466.
What is Thien-kim Co's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.
Is Thien-kim Co enrolled in Medicare?
Yes. Thien-kim Co 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 Thien-kim Co's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thien-kim Co reassigns Medicare benefits to 2 organizations: Prohealth Partners A Medical Group (Los Alamitos, CA) and Excell Integrated Medical Group Inc (Paramount, 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 Thien-kim Co'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 Thien-kim Co was last updated on October 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 days 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.
# Thien-Kim Nguyen Co, DO · NPI 1033732953
Nephrology physician in Los Alamitos, California. Individual provider, active in the CMS NPPES registry since May 27, 2020.
## Identity
- **NPI:** 1033732953 (Entity type: Individual)
- **Enumerated:** May 27, 2020
- **Primary specialty:** Internal Medicine - Nephrology · taxonomy 207RN0300X
- **State license:** 20A20255 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 3851 KATELLA AVE STE 325, Los Alamitos, CA 90720-3574
- **Phone:** (562) 286-6466
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Prohealth Partners A Medical Group (NPI 1972637890, Los Alamitos, CA); Excell Integrated Medical Group Inc (NPI 1659909521, Paramount, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** October 17, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1033732953) · Data from the CMS NPPES public registry.