Thomas Ngoc Phan, M.D.
Psychiatry Physician · Costa Mesa, CA
Thomas Ngoc Phan, M.D. is a psychiatry physician with a practice address in Costa Mesa, California, and NPI 1740716687, issued on May 11, 2017. Check the license (California A170266, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Ngoc Phan
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- A170266 CA
BP10060945 TX
Self-reported in NPPES; status is on the state search - Practice location
- 1640 Newport Blvd Ste 110, Costa Mesa, CA 92627
- Phone
- (925) 282-1778
- Enumerated
- May 11, 2017
- Record last updated
- Feb 17, 2025
- Fax
- (415) 296-5299
- Medicare enrollment
- Enrolled (PECOS I20250227002299); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 1640 Newport Blvd Ste 110
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karen Aung, PSYD, LPClinical Psychologist1689081788
- Lillie Avetisyan-Harvey, LCSWClinical Social Worker1427628247
- Marian Cao, LMFTMarriage & Family Therapist1922578772
- Karissa Chisum, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1558042101
- Erika Clever, LMFTMarriage & Family Therapist1184391971
- Julia Cramer, LMFTMarriage & Family Therapist1679313126
Verify Thomas Ngoc Phan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A170266Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average psychiatry physician in 2024
16 Medicare Part D claims, 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.
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.
Thomas Ngoc Phan among 8,673 psychiatry physician records in California
Thomas Ngoc Phan, 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 2017, is newer than 79% of them.
- NPI issued2017 · 79% of these records are older, 18% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 38% of these records are
- Graduated2017 · median 2005 among the 3,295 with a school on file
- 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).
Psychiatry Physician providers in California
There are 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Costa Mesa → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Evagelos Coskinas, M.D.Costa Mesa, CA 926271437382314
- Gary Dylewski, DOCosta Mesa, CA 926271831383207
- Hugo Gomez RuedaCosta Mesa, CA 926271346701455
- Diane Highum, M.D.Costa Mesa, CA 926271396868386
- Harvey Jaffe, M.D.Costa Mesa, CA 926271194751123
- Gail Ross, M.D.Costa Mesa, CA 926271619043361
- Michael Schwartz, D.O.Costa Mesa, CA 926271861584708
- Nisha Warikoo, M.D.Costa Mesa, CA 926271306164462
Common questions
What is Thomas Ngoc Phan, M.D.'s NPI number?
Thomas Ngoc Phan, M.D.'s National Provider Identifier (NPI) is 1740716687, issued on May 11, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Ngoc Phan, M.D. located?
The NPPES record lists a practice address at 1640 Newport Blvd Ste 110, Costa Mesa, CA, 92627. Phone: (925) 282-1778. Providers update this record themselves, so call before visiting.
How can I verify Thomas Ngoc Phan, M.D.'s license?
NPPES lists California license number A170266, 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 Ngoc Phan, M.D. prescribe under Medicare Part D?
In 2024, Thomas Ngoc Phan, M.D. had 16 Medicare Part D claims; 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.