Alec Chang, D.O.
Psychiatry Physician · Greenbrae, CA
Alec Chang, D.O. is a psychiatry physician with a practice address in Greenbrae, California, and NPI 1013259415, issued on Mar 23, 2013. Check the license (California 20A14880, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Alec Chang
- Credential
- D.O.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 20A14880 CA
Self-reported in NPPES; status is on the state search - Practice location
- 250 Bon Air RD, Greenbrae, CA 94904
- Phone
- (415) 473-6835
- Enumerated
- Mar 23, 2013
- Record last updated
- Jul 21, 2022
- Medicare enrollment
- Enrolled (PECOS I20161129000590); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 250 Bon Air RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Abrahams, MFTMarriage & Family Therapist1184738445
- Jory Adam, PA-CSurgical Physician Assistant1922269521
- Samuel Adams, MDHospitalist Physician1497785034
- Barbara Addleman, RNRegistered Nurse1053551267
- Linda Alexander, RNPsychiatric/Mental Health Registered Nurse1205589405
- Maxwell AlikinneyCounselor1538668728
Verify Alec Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A14880Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average psychiatry physician in 2024
64 Medicare Part D claims for 16 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- County OF MarinGreenbrae, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alec Chang among 8,673 psychiatry physician records in California
Alec Chang, D.O. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 69% of them.
- NPI issued2013 · 69% of these records are older, 29% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2013 · median 2005 among the 3,295 with a school on file
- Record last updated2022 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
18 psychiatry physician records list a practice address in Greenbrae
They are 18 of the 727 NPPES records with a practice address in Greenbrae, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Greenbrae → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Gordon Baumbacher, M.D.Kentfield, CA 949041144378217
- Heather Carlberg, M.D.Greenbrae, CA 949041346329968
- Mary Ann Caswick, MDGreenbrae, CA 949041467503912
- Sarah Centeno, MDKentfield, CA 949041366409922
- Richard Glass, M.D.Greenbrae, CA 949041952497745
- Carolyn Gracie, M.D.Kentfield, CA 949041639260862
- Jeanette Margolin, M.D.Kentfield, CA 949041447299243
- Edwyne Nazarian, MDKentfield, CA 949041093868655
Common questions
What is Alec Chang, D.O.'s NPI number?
Alec Chang, D.O.'s National Provider Identifier (NPI) is 1013259415, issued on Mar 23, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Alec Chang, D.O. located?
The NPPES record lists a practice address at 250 Bon Air RD, Greenbrae, CA, 94904. Phone: (415) 473-6835. Providers update this record themselves, so call before visiting.
How can I verify Alec Chang, D.O.'s license?
NPPES lists California license number 20A14880, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alec Chang, D.O. prescribe under Medicare Part D?
In 2024, Alec Chang, D.O. had 64 Medicare Part D claims for 16 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.