Ennis Zaitoon, M.D.
Internal Medicine Physician · Corona, CA
Ennis Zaitoon, M.D. is an internal medicine physician with a practice address in Corona, California, and NPI 1235307141, issued on Feb 13, 2008. Check the license (California C160730, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ennis Zaitoon
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C160730 CA
01067223 IN
Self-reported in NPPES; status is on the state search - Practice location
- 21634 Retreat Pkwy, Corona, CA 92883
- Phone
- (951) 493-6870
- Enumerated
- Feb 13, 2008
- Record last updated
- Sep 17, 2024
- Fax
- (951) 826-8157
- Medicaid ID
- 200963970 IN
- Medicare enrollment
- Enrolled (PECOS I20201026001379); 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 21634 Retreat Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ennis Zaitoon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C160730Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% more Medicare Part D claims than the average internal medicine physician in 2024
4,293 Medicare Part D claims for 382 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Atorvastatin Calcium285 claims
- Amlodipine Besylate205 claims
- Losartan Potassium196 claims
- Lisinopril142 claims
- Metformin Hcl142 claims
- Levothyroxine Sodium122 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: $227.28
11 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Riverside Medical Clinic IncRiverside, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ennis Zaitoon among 17,696 internal medicine physician records in California
Ennis Zaitoon, M.D. 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 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 40% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2004 among the 11,065 with a school on file
- Record last updated2024 · 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).
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 17,696 in California → Every provider in Corona → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Corcoran, M.D.Corona, CA 928831134376627
- Mario Ficarola, M.D.Corona, CA 928831104939529
- Fatima Gauhar, MDCorona, CA 928831619959517
- Sophia Ho, DOCorona, CA 928831790245256
- Mohammad Shahin, MDCorona, CA 928831053393959
- Michelle Zaki, D.O.Corona, CA 928831992237325
- Thomas Assali, DOCorona, CA 928821598225062
- Patrick Bonaparte, M.D.Corona, CA 928821508260340
Common questions
What is Ennis Zaitoon, M.D.'s NPI number?
Ennis Zaitoon, M.D.'s National Provider Identifier (NPI) is 1235307141, issued on Feb 13, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Ennis Zaitoon, M.D. located?
The NPPES record lists a practice address at 21634 Retreat Pkwy, Corona, CA, 92883. Phone: (951) 493-6870. Providers update this record themselves, so call before visiting.
How can I verify Ennis Zaitoon, M.D.'s license?
NPPES lists California license number C160730, 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 Ennis Zaitoon, M.D. prescribe under Medicare Part D?
In 2024, Ennis Zaitoon, M.D. had 4,293 Medicare Part D claims for 382 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.