Evan G. Tzakis, MD
Psychiatry Physician · Riverside, CA
Evan G. Tzakis, MD is a psychiatry physician with a practice address in Riverside, California, and NPI 1609943422, issued on Nov 29, 2006. Check the license (California G75939, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Evan G. Tzakis
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G75939 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10800 Magnolia Ave, Riverside, CA 92505
- Phone
- (909) 353-2000
- Enumerated
- Nov 29, 2006
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 10800 Magnolia Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Evan G. Tzakis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G75939Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average psychiatry physician in 2024
243 Medicare Part D claims for 192 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Buspirone Hcl18 claims
- Trazodone Hcl16 claims
- Quetiapine Fumarate14 claims
- Lorazepam12 claims
- Venlafaxine Hcl Er12 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.
Evan G. Tzakis among 8,673 psychiatry physician records in California
Evan G. Tzakis, MD is one of 8,673 psychiatry physician records with a practice address in California. 67% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2021 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
134 psychiatry physician records list a practice address in Riverside
They are 134 of the 13,893 NPPES records with a practice address in Riverside, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Riverside → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Lilian Caylan, MDRiverside, CA 925051871660696
- Daniel Hackett, MDRiverside, CA 925051982775961
- Mark HreishRiverside, CA 925051164839502
- Quiana JohnsonRiverside, CA 925051104745413
- Naga Kothapalli, MDRiverside, CA 925051619301579
- David Scarpino, MDRiverside, CA 925051548251192
- Maria Villarosa, MDRiverside, CA 925051861540759
- Joanne Wyszomirski-Witkowski, MDRiverside, CA 925051962579813
Common questions
What is Evan G. Tzakis, MD's NPI number?
Evan G. Tzakis, MD's National Provider Identifier (NPI) is 1609943422, issued on Nov 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Evan G. Tzakis, MD located?
The NPPES record lists a practice address at 10800 Magnolia Ave, Riverside, CA, 92505. Phone: (909) 353-2000. Providers update this record themselves, so call before visiting.
How can I verify Evan G. Tzakis, MD's license?
NPPES lists California license number G75939, 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 Evan G. Tzakis, MD prescribe under Medicare Part D?
In 2024, Evan G. Tzakis, MD had 243 Medicare Part D claims for 192 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.