Allen A. Hassen, M.D.
Family Medicine Physician · West Covina, CA
Allen A. Hassen, M.D. is a family medicine physician with a practice address in West Covina, California, and NPI 1659604023, issued on Sep 16, 2009. Check the license (California A114943, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Allen A. Hassen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A114943 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3121 E Hillside Dr, West Covina, CA 91791
- Phone
- (626) 347-8220
- Enumerated
- Sep 16, 2009
- Record last updated
- Jul 13, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190716001886); accepts Medicare assignment
- Entity
- Type 1 · individual
Verify Allen A. Hassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114943Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
15% fewer Medicare Part D claims than the average family medicine physician in 2024
3,002 Medicare Part D claims for 318 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 35 claims were for opioids.
Most prescribed
- Atorvastatin Calcium271 claims
- Metformin Hcl137 claims
- Amlodipine Besylate135 claims
- Lisinopril129 claims
- Losartan Potassium120 claims
- Levothyroxine Sodium90 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.
Industry payments in 2024: $425.04
16 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Bills Medicare through one group practice
- Southern California Medical Center IncEl Monte, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
69 family medicine physician records list a practice address in West Covina
They are 69 of the 2,450 NPPES records with a practice address in West Covina, and 17,133 family medicine physician records in California.
All 69 in West Covina → All 17,133 in California → Every provider in West Covina →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Allen A. Hassen, M.D.'s NPI number?
Allen A. Hassen, M.D.'s National Provider Identifier (NPI) is 1659604023, issued on Sep 16, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Allen A. Hassen, M.D. located?
The NPPES record lists a practice address at 3121 E Hillside Dr, West Covina, CA, 91791. Phone: (626) 347-8220. Providers update this record themselves, so call before visiting.
How can I verify Allen A. Hassen, M.D.'s license?
NPPES lists California license number A114943, 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 Allen A. Hassen, M.D. prescribe under Medicare Part D?
In 2024, Allen A. Hassen, M.D. had 3,002 Medicare Part D claims for 318 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.