EWEN AUDREY CHAO MD
NPI 1326434929
Student in an Organized Health Care Education/Training Program in Stony Brook, NY
About Ewen Audrey Chao Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EWEN AUDREY CHAO MD (NPI 1326434929) is an individual student in an organized health care education/training program in Stony Brook, New York and active in the NPI registry since April 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2015).
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
Ewen Audrey Chao Md 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 Ewen Chao reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Diego, CA 92120
- Reassigned Medicare billing, California enrollment
- 13,921 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.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STONY BROOK, NY 11794
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 Ewen Chao's NPI number?
The NPI number for Ewen Chao is 1326434929. It was assigned to this individual provider in the NPPES registry on April 9, 2015.
Where is Ewen Chao located?
Ewen Chao practices at Department Of Surgery Health Science Tower Level 19 Rm 030, Stony Brook, NY 11794. The listed phone number is (631) 444-1791.
What is Ewen Chao's specialty?
The primary specialty registered for this NPI is Student in an Organized Health Care Education/Training Program with taxonomy code 390200000X.
Is Ewen Chao enrolled in Medicare?
Yes. Ewen Chao 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 Ewen Chao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ewen Chao reassigns Medicare benefits to Southern California Permanente Medical Group (San Diego, 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 Ewen Chao'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 Ewen Chao was last updated on October 27, 2023. 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.
# Ewen Audrey Chao, MD · NPI 1326434929
Student in an Organized Health Care Education/Training Program provider in Stony Brook, New York. Individual provider, active in the CMS NPPES registry since April 9, 2015.
## Identity
- **NPI:** 1326434929 (Entity type: Individual)
- **Enumerated:** April 9, 2015
- **Primary specialty:** Student in an Organized Health Care Education/Training Program · taxonomy 390200000X
- **Sole proprietor:** No
## Practice location
- **Address:** DEPARTMENT OF SURGERY, HEALTH SCIENCE TOWER LEVEL 19 RM 030, Stony Brook, NY 11794-8191
- **Phone:** (631) 444-1791 · **Fax:** (631) 444-7689
## 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:** Southern California Permanente Medical Group (NPI 1225060742, San Diego, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** October 27, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1326434929) · Data from the CMS NPPES public registry.