ALEC CHANG D.O.
NPI 1013259415
Psychiatry & Neurology - Psychiatry in Greenbrae, CA
About Alec Chang D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEC CHANG D.O. (NPI 1013259415) is an individual psychiatry provider in Greenbrae, California, licensed in California (20A14880) and active in the NPI registry since March 2013. He is enrolled in Medicare PECOS, maintains a secondary practice location in Reno, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Alec Chang 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
2Medicare enrollment records show Alec Chang reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Greenbrae, CA 94904
- Reassigned Medicare billing, California enrollment
- 34 clinicians in this Medicare group
Oakland, CA 94602
- Reassigned Medicare billing, California enrollment
- 900 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94904 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GREENBRAE, CA 94904
GREENBRAE, CA 94904
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 Alec Chang's NPI number?
The NPI number for Alec Chang is 1013259415. It was assigned to this individual provider in the NPPES registry on March 23, 2013.
Where is Alec Chang located?
Alec Chang practices at 250 Bon Air Rd, Greenbrae, CA 94904. The listed phone number is (415) 473-6835.
What is Alec Chang's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Alec Chang enrolled in Medicare?
Yes. Alec Chang 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 Alec Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alec Chang reassigns Medicare benefits to 2 organizations: County Of Marin (Greenbrae, CA) and Alameda Health System (Oakland, 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 Alec Chang'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 Alec Chang was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Alec Chang, D.O. · NPI 1013259415
Psychiatry physician in Greenbrae, California. Individual provider, active in the CMS NPPES registry since March 23, 2013.
## Identity
- **NPI:** 1013259415 (Entity type: Individual)
- **Enumerated:** March 23, 2013
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** 20A14880 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 250 BON AIR RD, Greenbrae, CA 94904-1702
- **Phone:** (415) 473-6835
## 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): County Of Marin (NPI 1568525699, Greenbrae, CA); Alameda Health System (NPI 1740332931, Oakland, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** July 21, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1013259415) · Data from the CMS NPPES public registry.