David Z. Ritvo, M.D.
Psychiatry Physician · Walnut Creek, CA
David Z. Ritvo, M.D. is a psychiatry physician with a practice address in Walnut Creek, California, and NPI 1205832094, issued on Jun 26, 2005. Check the license (California G30097, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- David Z. Ritvo
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G30097 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1910 Olympic Blvd, Walnut Creek, CA 94596
- Phone
- (925) 944-1002
- Enumerated
- Jun 26, 2005
- Record last updated
- Sep 11, 2025
- Fax
- (925) 939-4159
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 1910 Olympic Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- James BrisbonBehavior Technician1710479118
- Frederick BrowneMarriage & Family Therapist1528494820
- Adrianna Faasala-MairCounselor1346719747
- Bruce Feingold, PH.D.Mental Health Counselor1265453674
Verify David Z. Ritvo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G30097Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average psychiatry physician in 2024
260 Medicare Part D claims for 14 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Diazepam25 claims
- Alprazolam24 claims
- Clonazepam17 claims
- Sertraline Hcl16 claims
- Quetiapine Fumarate15 claims
- Trazodone Hcl15 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.
David Z. Ritvo among 8,673 psychiatry physician records in California
David Z. Ritvo, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 98% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2025 · 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).
67 psychiatry physician records list a practice address in Walnut Creek
They are 67 of the 6,170 NPPES records with a practice address in Walnut Creek, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Walnut Creek → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Orin Bigman, MDWalnut Creek, CA 945961669550760
- Eugene Crayton, MDWalnut Creek, CA 945961740327923
- Dharmini Harichandran, M.DWalnut Creek, CA 945961386668820
- Chelvadurai Harichandran, M.DWalnut Creek, CA 945961386782860
- John Hawkins, DOWalnut Creek, CA 945961730267824
- Michael Schwab, M.D.Walnut Creek, CA 945961093880601
- Richard Silver, MDWalnut Creek, CA 945961891873972
- Alex Smirnoff, M.D.Walnut Creek, CA 945961649329681
Common questions
What is David Z. Ritvo, M.D.'s NPI number?
David Z. Ritvo, M.D.'s National Provider Identifier (NPI) is 1205832094, issued on Jun 26, 2005. An NPI identifies a provider in billing; it is not a license.
Where is David Z. Ritvo, M.D. located?
The NPPES record lists a practice address at 1910 Olympic Blvd, Walnut Creek, CA, 94596. Phone: (925) 944-1002. Providers update this record themselves, so call before visiting.
How can I verify David Z. Ritvo, M.D.'s license?
NPPES lists California license number G30097, 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 David Z. Ritvo, M.D. prescribe under Medicare Part D?
In 2024, David Z. Ritvo, M.D. had 260 Medicare Part D claims for 14 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.