Stuart Alexander Chalfin, M.D.
Urology Physician · Los Alamitos, CA
Stuart Alexander Chalfin, M.D. is a urology physician with a practice address in Los Alamitos, California, and NPI 1699871608, issued on Sep 16, 2006. Check the license (California G34287, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stuart Alexander Chalfin
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License number
- G34287 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3791 Katella Ave, Los Alamitos, CA 90720
- Phone
- (562) 598-6166
- Enumerated
- Sep 16, 2006
- Record last updated
- Mar 19, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (562) 799-8210
- Medicaid ID
- 00G342870 CA
- Entity
- Type 1 · individual
8 nearest urology physician records → All 1,524 in California → Look up another NPI →
Also registered at 3791 Katella Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allen Anae, MDSurgery Physician1861425183
- Ruben Baghdassarian, M.D.Urology Physician1518063510
- Alan Cohen, M.D.Neurology Physician1902843659
- Lauren Dolan, PA-CPhysician Assistant1700107091
- Chinenye Egwuonwu, NPObstetrics & Gynecology Nurse Practitioner1184960890
- James Ger, M.D.Obstetrics & Gynecology Physician1598725368
Verify Stuart Alexander Chalfin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G34287Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average urology physician in 2024
18 Medicare Part D claims, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
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.
Stuart Alexander Chalfin among 1,524 urology physician records in California
Stuart Alexander Chalfin, M.D. is one of 1,524 urology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 51% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208800000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in California
There are 1,524 urology physician records in California.
All 1,524 in California → Every provider in Los Alamitos → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Marc Abboud, MDLos Alamitos, CA 907201265096531
- Ruben Baghdassarian, M.D.Los Alamitos, CA 907201518063510
- Alexa Chai, M.D.Los Alamitos, CA 907201437393303
- Jennifer Liu, M. D.Los Alamitos, CA 907201669623161
- Lawrence Paletz, M.D.Los Alamitos, CA 907201578548897
- Edward Park, D.O.Los Alamitos, CA 907201366795106
- Henry Wu, M.D.Los Alamitos, CA 907201659489268
- Thomas Calvert, M.D.Lakewood, CA 907121982042677
Common questions
What is Stuart Alexander Chalfin, M.D.'s NPI number?
Stuart Alexander Chalfin, M.D.'s National Provider Identifier (NPI) is 1699871608, issued on Sep 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stuart Alexander Chalfin, M.D. located?
The NPPES record lists a practice address at 3791 Katella Ave, Los Alamitos, CA, 90720. Phone: (562) 598-6166. Providers update this record themselves, so call before visiting.
How can I verify Stuart Alexander Chalfin, M.D.'s license?
NPPES lists California license number G34287, 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 Stuart Alexander Chalfin, M.D. prescribe under Medicare Part D?
In 2024, Stuart Alexander Chalfin, M.D. had 18 Medicare Part D claims; the average among urology physician prescribers was 1,340. 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.