Thomas Sami Assali, DO
Internal Medicine Physician · Corona, CA
Thomas Sami Assali, DO is an internal medicine physician with a practice address in Corona, California, and NPI 1598225062, issued on Mar 21, 2019. Check the license (California 20A19758, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Sami Assali
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A19758 CA
Self-reported in NPPES; status is on the state search - Practice location
- 800 S Main St, Corona, CA 92882
- Phone
- (951) 737-4343
- Enumerated
- Mar 21, 2019
- Record last updated
- Nov 21, 2022
- Medicare enrollment
- Enrolled (PECOS I20220721003818); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 800 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Charles Addo-Yobo, DOEmergency Medicine Physician1821625955
- James Ahn, M.D.Anesthesiology Physician1588641963
- Julie Ahn, PA-CPhysician Assistant1346802543
- Cynthia Bailey, P.A.-CPhysician Assistant1316053036
- David Bear, M.D.Emergency Medicine Physician1114033883
- Denise Bedolla, FNP-BCNurse Practitioner1720700503
Verify Thomas Sami Assali in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A19758Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
626 Medicare Part D claims for 199 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 40 claims were for opioids.
Most prescribed
- Losartan Potassium25 claims
- Meloxicam25 claims
- Atorvastatin Calcium23 claims
- Albuterol Sulfate Hfa21 claims
- Prednisone19 claims
- Azithromycin18 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
- Southern California Permanente Medical GroupRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
52 internal medicine physician records list a practice address in Corona
They are 52 of the 3,731 NPPES records with a practice address in Corona, and 17,696 internal medicine physician records in California.
All 52 in Corona → All 17,696 in California → Every provider in Corona →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Thomas Sami Assali, DO's NPI number?
Thomas Sami Assali, DO's National Provider Identifier (NPI) is 1598225062, issued on Mar 21, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Sami Assali, DO located?
The NPPES record lists a practice address at 800 S Main St, Corona, CA, 92882. Phone: (951) 737-4343. Providers update this record themselves, so call before visiting.
How can I verify Thomas Sami Assali, DO's license?
NPPES lists California license number 20A19758, 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 Thomas Sami Assali, DO prescribe under Medicare Part D?
In 2024, Thomas Sami Assali, DO had 626 Medicare Part D claims for 199 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.