Omar A. Mesarwi, MD
Critical Care Medicine (Internal Medicine) Physician · San Diego, CA
Omar A. Mesarwi, MD is a critical care medicine (internal medicine) physician with a practice address in San Diego, California, and NPI 1245430032, issued on Jul 20, 2007. Check the license (California A144727, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Omar A. Mesarwi
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- A144727 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4520 Executive Dr, San Diego, CA 92121
- Phone
- (800) 926-8273
- Enumerated
- Jul 20, 2007
- Record last updated
- Jun 10, 2026
- Medicare enrollment
- Enrolled (PECOS I20161018002000); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 723 in California → Look up another NPI →
Also registered at 4520 Executive Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathryn Affleck, PTPhysical Therapist1922026491
- Tara Akins, FNPFamily Nurse Practitioner1548475072
- Praveen Akuthota, M.D.Critical Care Medicine (Internal Medicine) Physician1396704698
- Mario Alberti, DDSGeneral Practice Dentistry1982705893
- John Alexander, PTPhysical Therapist1194743674
- Daniel Crouch, MDCritical Care Medicine (Internal Medicine) Physician1710182423
Verify Omar A. Mesarwi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A144727Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
21 Medicare Part D claims, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Eszopiclone13 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
- Regents OF The University OF CaliforniaSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Omar A. Mesarwi among 723 critical care medicine (internal medicine) physician records in California
Omar A. Mesarwi, MD is one of 723 critical care medicine (internal medicine) physician records with a practice address in California. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 46% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2007 · median 2005 among the 559 with a school on file
- Record last updated2026 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in California
There are 723 critical care medicine (internal medicine) physician records in California.
All 723 in California → Every provider in San Diego → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Praveen Akuthota, M.D.San Diego, CA 921211396704698
- Daniel Crouch, MDSan Diego, CA 921211710182423
- Naveen Gupta, MDSan Diego, CA 921211013015569
- Jeremy Orr, M.D.San Diego, CA 921211992940969
- Juan Deza, M.D.San Diego, CA 921231407846157
- William Fisher, M.D.San Diego, CA 921231245674001
- Frank GrassiSan Diego, CA 921231659342624
- Thomas Lawrie, M.D.San Diego, CA 921231124020755
Common questions
What is Omar A. Mesarwi, MD's NPI number?
Omar A. Mesarwi, MD's National Provider Identifier (NPI) is 1245430032, issued on Jul 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Omar A. Mesarwi, MD located?
The NPPES record lists a practice address at 4520 Executive Dr, San Diego, CA, 92121. Phone: (800) 926-8273. Providers update this record themselves, so call before visiting.
How can I verify Omar A. Mesarwi, MD's license?
NPPES lists California license number A144727, 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 Omar A. Mesarwi, MD prescribe under Medicare Part D?
In 2024, Omar A. Mesarwi, MD had 21 Medicare Part D claims; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.