Koosha Mortazavi, M.D.
Nephrology Physician · Oxnard, CA
Koosha Mortazavi, M.D. is a nephrology physician with a practice address in Oxnard, California, and NPI 1215966999, issued on Jul 3, 2006. Check the license (California A91559, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Koosha Mortazavi
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- A91559 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 W Gonzales RD, Oxnard, CA 93036
- Phone
- (805) 278-9094
- Enumerated
- Jul 3, 2006
- Record last updated
- Jan 14, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (805) 278-8964
- Medicaid ID
- ZZZ75566Z CA
- Medicare enrollment
- Enrolled (PECOS I20060706000272); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 1200 W Gonzales RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nicholas Bednarski, M.D.Nephrology Physician1457425860
- Frank Chieu, M.D.Nephrology Physician1235203647
- Ali Dana, M.D.Nephrology Physician1669561536
- Mariam Gyulnazaryan, PA-CPhysician Assistant1275316473
- Steven Ledesma, M.D.Nephrology Physician1386718799
- Tane Liu, M.D.Nephrology Physician1588738991
Verify Koosha Mortazavi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A91559Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% more Medicare Part D claims than the average nephrology physician in 2024
2,208 Medicare Part D claims for 309 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Amlodipine Besylate263 claims
- Losartan Potassium193 claims
- Furosemide190 claims
- Hydralazine Hcl168 claims
- Farxiga107 claims
- Hydrochlorothiazide99 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 2 group practices
- Community Memorial Health SystemVentura, CA
- Vista Del Mar Medical Group IncOxnard, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Koosha Mortazavi among 1,468 nephrology physician records in California
Koosha Mortazavi, M.D. is one of 1,468 nephrology physician records with a practice address in California. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 48% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1997 · median 2001 among the 1,128 with a school on file
- Record last updated2010 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Oxnard → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Nicholas Bednarski, M.D.Oxnard, CA 930361457425860
- Frank Chieu, M.D.Oxnard, CA 930361235203647
- Ali Dana, M.D.Oxnard, CA 930361669561536
- Gregory Krastein, MDOxnard, CA 930361942358759
- Steven Ledesma, M.D.Oxnard, CA 930361386718799
- Tane Liu, M.D.Oxnard, CA 930361588738991
- Hashim Mapara, MDOxnard, CA 930361306074927
- Rajendra Niraula, MDOxnard, CA 930361922201003
Common questions
What is Koosha Mortazavi, M.D.'s NPI number?
Koosha Mortazavi, M.D.'s National Provider Identifier (NPI) is 1215966999, issued on Jul 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Koosha Mortazavi, M.D. located?
The NPPES record lists a practice address at 1200 W Gonzales RD, Oxnard, CA, 93036. Phone: (805) 278-9094. Providers update this record themselves, so call before visiting.
How can I verify Koosha Mortazavi, M.D.'s license?
NPPES lists California license number A91559, 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 Koosha Mortazavi, M.D. prescribe under Medicare Part D?
In 2024, Koosha Mortazavi, M.D. had 2,208 Medicare Part D claims for 309 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.