Stephen A. Wertheimer, M.D.
Orthopaedic Surgery Physician · Los Alamitos, CA
Stephen A. Wertheimer, M.D. is an orthopaedic surgery physician with a practice address in Los Alamitos, California, and NPI 1952747701, issued on May 21, 2013. Check the license (California G10289, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen A. Wertheimer
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G10289 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4290 Katella Ave, Los Alamitos, CA 90720
- Phone
- (562) 493-4499
- Enumerated
- May 21, 2013
- Record last updated
- May 21, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (562) 493-6512
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 4290 Katella Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joseph Alban, M.D.Orthopaedic Surgery Physician1194161844
- Laura Hatch, M.D.Orthopaedic Surgery Physician1568808210
- Tomoji Mizuguchi, M.D.Orthopaedic Surgery Physician1710198627
Verify Stephen A. Wertheimer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G10289Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $20.14
1 payment: food and beverage; the largest payer was Calyxo, Inc. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Stephen A. Wertheimer among 2,276 orthopaedic surgery physician records in California
Stephen A. Wertheimer, M.D. is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% 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 80% of them.
- NPI issued2013 · 80% of these records are older, 18% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2013 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 orthopaedic surgery physician records list a practice address in Los Alamitos
They are 11 of the 1,035 NPPES records with a practice address in Los Alamitos, and 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Los Alamitos → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Duke Ahn, M.D.Los Alamitos, CA 907201942318373
- Joseph Alban, M.D.Los Alamitos, CA 907201194161844
- Lawrence Feiwell, M.D.Los Alamitos, CA 907201932201787
- Andrew Hanflik, MDLos Alamitos, CA 907201508008178
- Laura Hatch, M.D.Los Alamitos, CA 907201568808210
- Raymond Klug, M.D.Los Alamitos, CA 907201295829083
- Diana Lau, M.D.Los Alamitos, CA 907201669600011
- Tomoji Mizuguchi, M.D.Los Alamitos, CA 907201710198627
Common questions
What is Stephen A. Wertheimer, M.D.'s NPI number?
Stephen A. Wertheimer, M.D.'s National Provider Identifier (NPI) is 1952747701, issued on May 21, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Stephen A. Wertheimer, M.D. located?
The NPPES record lists a practice address at 4290 Katella Ave, Los Alamitos, CA, 90720. Phone: (562) 493-4499. Providers update this record themselves, so call before visiting.
How can I verify Stephen A. Wertheimer, M.D.'s license?
NPPES lists California license number G10289, 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.
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.