Thomas Hiroshi Okamoto, M.D.
Psychiatry Physician · Santa Ana, CA
Thomas Hiroshi Okamoto, M.D. is a psychiatry physician with a practice address in Santa Ana, California, and NPI 1235178021, issued on Jun 6, 2006. Check the license (California G48164, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Hiroshi Okamoto
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G48164 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2130 E 4TH St, Santa Ana, CA 92705
- Phone
- (714) 558-2460
- Enumerated
- Jun 6, 2006
- Record last updated
- Jun 30, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (714) 972-0275
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 2130 E 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Wendy AlvarezMental Health Counselor1720694128
- Cynthia AndradeCommunity Health Worker1831833557
- Wesley BacchusMental Health Counselor1629358643
- Sam Bartaluzzi, MFTIMental Health Counselor1518292044
- Rose Becerra, BAMental Health Counselor1518055185
- Diane BenjaminMental Health Counselor1255420477
Verify Thomas Hiroshi Okamoto in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G48164Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average psychiatry physician in 2024
2,710 Medicare Part D claims for 128 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Lamotrigine290 claims
- Quetiapine Fumarate194 claims
- Bupropion Xl168 claims
- Trazodone Hcl119 claims
- Vilazodone Hcl101 claims
- Dextroamphetamine-Amphetamine91 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.
Industry payments in 2024: $1,804.62
97 payments; by number, the most common kind was food and beverage; the largest payer was Iti, Inc. (d/b/a Intra-Cellular Therapies, Inc.). The 13,693 providers of this specialty with any payment received $4,954.93 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Thomas Hiroshi Okamoto among 8,673 psychiatry physician records in California
Thomas Hiroshi Okamoto, 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 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 updated2009 · 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).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Santa Ana → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Serge Abdishoo, M.D.Santa Ana, CA 927051336162759
- Emad Aziz, MDSanta Ana, CA 927051255383030
- Katalin Bassett, MDSanta Ana, CA 927051205964129
- Priti Bhardwaj, M.D.Santa Ana, CA 927051750419230
- John Duffy, MDSanta Ana, CA 927051255497251
- Ted Greenzang, MDSanta Ana, CA 927051629133780
- Santi Pattara, M.D.Santa Ana, CA 927051982796165
- Geoffrey Phillips, M.D.Santa Ana, CA 927051396745501
Common questions
What is Thomas Hiroshi Okamoto, M.D.'s NPI number?
Thomas Hiroshi Okamoto, M.D.'s National Provider Identifier (NPI) is 1235178021, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Hiroshi Okamoto, M.D. located?
The NPPES record lists a practice address at 2130 E 4TH St, Santa Ana, CA, 92705. Phone: (714) 558-2460. Providers update this record themselves, so call before visiting.
How can I verify Thomas Hiroshi Okamoto, M.D.'s license?
NPPES lists California license number G48164, 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 Thomas Hiroshi Okamoto, M.D. prescribe under Medicare Part D?
In 2024, Thomas Hiroshi Okamoto, M.D. had 2,710 Medicare Part D claims for 128 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.