Gerald A. Cohen, MD
Internal Medicine Physician · Los Alamitos, CA
Gerald A. Cohen, MD is an internal medicine physician with a practice address in Los Alamitos, California, and NPI 1306877253, issued on Jul 6, 2006. Check the license (California G34856, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gerald A. Cohen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G34856 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3801 Katella Ave, Los Alamitos, CA 90720
- Phone
- (562) 594-9546
- Enumerated
- Jul 6, 2006
- Record last updated
- Mar 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (562) 598-0258
- Medicare enrollment
- Enrolled (PECOS I20100312000925); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3801 Katella Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gerald A. Cohen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G34856Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average internal medicine physician in 2024
3,795 Medicare Part D claims for 263 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 76 claims were for opioids.
Most prescribed
- Atorvastatin Calcium249 claims
- Amlodipine Besylate217 claims
- Levothyroxine Sodium207 claims
- Losartan Potassium167 claims
- Lisinopril132 claims
- Gabapentin124 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.
Bills Medicare through one group practice
- Prohealth Partners, A Medical GroupLos Alamitos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gerald A. Cohen among 17,696 internal medicine physician records in California
Gerald A. Cohen, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1976 · median 2004 among the 11,065 with a school on file
- Record last updated2018 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
40 internal medicine physician records list a practice address in Los Alamitos
They are 40 of the 1,035 NPPES records with a practice address in Los Alamitos, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Alamitos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Barry Allswang, MDLos Alamitos, CA 907201720016397
- Carlos ArguedasLos Alamitos, CA 907201023075579
- Vichai Bhoopat, M.D.Los Alamitos, CA 907201841211497
- Winston Chung, MDLos Alamitos, CA 907201851322085
- Heena Contractor, M.D.Los Alamitos, CA 907201518954973
- William Harrell, MDLos Alamitos, CA 907201083673685
- Taolin Jen, M.D.Rossmoor, CA 907201457384828
- Harold Lin, M.D.Los Alamitos, CA 907201467472472
Common questions
What is Gerald A. Cohen, MD's NPI number?
Gerald A. Cohen, MD's National Provider Identifier (NPI) is 1306877253, issued on Jul 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gerald A. Cohen, MD located?
The NPPES record lists a practice address at 3801 Katella Ave, Los Alamitos, CA, 90720. Phone: (562) 594-9546. Providers update this record themselves, so call before visiting.
How can I verify Gerald A. Cohen, MD's license?
NPPES lists California license number G34856, 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 Gerald A. Cohen, MD prescribe under Medicare Part D?
In 2024, Gerald A. Cohen, MD had 3,795 Medicare Part D claims for 263 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.