DR. REGAN ALEXANDER CHAN D.O.
NPI 1558546341
Family Medicine in Orange, CA
About Dr. Regan Alexander Chan D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. REGAN ALEXANDER CHAN D.O. (NPI 1558546341) is an individual family medicine provider in Orange, California, licensed in California (20A10204) and active in the NPI registry since December 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2006).
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
Dr. Regan Alexander Chan D.o. 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
3Medicare enrollment records show Regan Chan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 114 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 75 clinicians in this Medicare group
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 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 92868 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 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ORANGE, CA 92868
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 Regan Chan's NPI number?
The NPI number for Regan Chan is 1558546341. It was assigned to this individual provider in the NPPES registry on December 31, 2007.
Where is Regan Chan located?
Regan Chan practices at 293 S Main St Suite 200, Orange, CA 92868. The listed phone number is (714) 838-8848.
What is Regan Chan's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Regan Chan enrolled in Medicare?
Yes. Regan Chan 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 Regan Chan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Regan Chan reassigns Medicare benefits to 3 organizations: Regents Of The University Of (Orange, CA), Regents Of The University Of California (Orange, CA) and Memorialcare Medical Foundation (Fountain Valley, 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 Regan Chan'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 Regan Chan was last updated on November 3, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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. Regan Alexander Chan, D.O. · NPI 1558546341
Family Medicine physician in Orange, California. Individual provider, active in the CMS NPPES registry since December 31, 2007.
## Identity
- **NPI:** 1558546341 (Entity type: Individual)
- **Enumerated:** December 31, 2007
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 20A10204 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 293 S MAIN ST, SUITE 200, Orange, CA 92868-3843
- **Phone:** (714) 838-8848
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of (NPI 1366590762, Orange, CA); Regents Of The University Of California (NPI 1679521850, Orange, CA); Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2006
## Record status
- **NPPES last updated:** November 3, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1558546341) · Data from the CMS NPPES public registry.