Marina Clarissa Thomas, MD
Obstetrics & Gynecology Physician · San Diego, CA
Marina Clarissa Thomas, MD is an obstetrics & gynecology physician with a practice address in San Diego, California, and NPI 1285196881, issued on Apr 2, 2019. Check the license (California A181503, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Marina Clarissa Thomas
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A181503 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9455 Clairemont Mesa Blvd, San Diego, CA 92123
- Phone
- (858) 688-2996
- Enumerated
- Apr 2, 2019
- Record last updated
- Jan 28, 2026
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 9455 Clairemont Mesa Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marina Clarissa Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A181503Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
54% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
76 Medicare Part D claims for 30 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Estradiol22 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.
Marina Clarissa Thomas among 5,088 obstetrics & gynecology physician records in California
Marina Clarissa Thomas, MD is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 92% of them.
- NPI issued2019 · 92% of these records are older, 6% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2026 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in San Diego → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Freydoun Alavi, M.D.San Diego, CA 921231205828167
- Elizabeth Cerrone, D.O.San Diego, CA 921231932147329
- Yvonne Goff, M.D.San Diego, CA 921231669556460
- Paul Goldstein, MDSan Diego, CA 921231407800246
- Kim Goodwin, M.D.San Diego, CA 921231669426276
- Sandra Lopez, M.D.San Diego, CA 921231962421651
- Anmar Mansour, M.D.San Diego, CA 921231881617884
- Colleen McNally, MDSan Diego, CA 921231114039062
Common questions
What is Marina Clarissa Thomas, MD's NPI number?
Marina Clarissa Thomas, MD's National Provider Identifier (NPI) is 1285196881, issued on Apr 2, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Marina Clarissa Thomas, MD located?
The NPPES record lists a practice address at 9455 Clairemont Mesa Blvd, San Diego, CA, 92123. Phone: (858) 688-2996. Providers update this record themselves, so call before visiting.
How can I verify Marina Clarissa Thomas, MD's license?
NPPES lists California license number A181503, 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 Marina Clarissa Thomas, MD prescribe under Medicare Part D?
In 2024, Marina Clarissa Thomas, MD had 76 Medicare Part D claims for 30 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. 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.