NANCY SUN M.D.
NPI 1821146051
Emergency Medicine in Simi Valley, CA
About Nancy Sun M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NANCY SUN M.D. (NPI 1821146051) is an individual emergency medicine provider in Simi Valley, California, licensed in California (A98171) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS and is a graduate of George Washington University School Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
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
Nancy Sun M.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 Reassignments
5Medicare enrollment records show Nancy Sun reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Simi Valley, CA 93065
- Reassigned Medicare billing, California enrollment
- 31 clinicians in this Medicare group
Thousand Oaks, CA 91360
- Reassigned Medicare billing, California enrollment
- 70 clinicians in this Medicare group
Tehachapi, CA 93561
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Ozona, TX 76943
- Reassigned Medicare billing, Texas enrollment
- 671 clinicians in this Medicare group
San Antonio, TX 78229
- Reassigned Medicare billing, Texas enrollment
- 1,452 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 6
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 93065 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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.
SIMI VALLEY, CA 93065
SIMI VALLEY, CA 93065
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 Nancy Sun's NPI number?
The NPI number for Nancy Sun is 1821146051. It was assigned to this individual provider in the NPPES registry on January 5, 2007.
Where is Nancy Sun located?
Nancy Sun practices at 2975 Sycamore Dr, Simi Valley, CA 93065. The listed phone number is (805) 955-6107.
What is Nancy Sun's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Nancy Sun enrolled in Medicare?
Yes. Nancy Sun 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 Nancy Sun's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nancy Sun reassigns Medicare benefits to 5 organizations: Allied Emergency Physicians, Inc. (Simi Valley, CA), Los Robles Emergency Physicians Medical Group (Thousand Oaks, CA), Cep America- California (Tehachapi, CA), Shannon Clinic (Ozona, TX) and Emergency Medicine Services Of Tx, PLLC (San Antonio, TX). 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 Nancy Sun's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nancy Sun accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 2 other insurers list Nancy Sun as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Nancy Sun was last updated on January 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Nancy Sun, M.D. · NPI 1821146051
Emergency Medicine physician in Simi Valley, California. Individual provider, active in the CMS NPPES registry since January 5, 2007.
## Identity
- **NPI:** 1821146051 (Entity type: Individual)
- **Enumerated:** January 5, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A98171 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2975 SYCAMORE DR, Simi Valley, CA 93065-1201
- **Phone:** (805) 955-6107 · **Fax:** (805) 527-9374
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Allied Emergency Physicians, Inc. (NPI 1043531346, Simi Valley, CA); Los Robles Emergency Physicians Medical Group (NPI 1417983552, Thousand Oaks, CA); Cep America- California (NPI 1912776329, Tehachapi, CA); Shannon Clinic (NPI 1245230465, Ozona, TX); Emergency Medicine Services Of Tx, PLLC (NPI 1245938729, San Antonio, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** George Washington University School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** January 28, 2020
- **Other identifiers:** Other A98171 (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1821146051) · Data from the CMS NPPES public registry.