Chun K. Ryu, M.D.
Psychiatry Physician · Santa Ana, CA
Chun K. Ryu, M.D. is a psychiatry physician with a practice address in Santa Ana, California, and NPI 1972775252, issued on Mar 27, 2008. Check the license (California A25717, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chun K. Ryu
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- A25717 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1633 E 4TH St, Santa Ana, CA 92701
- Phone
- (714) 543-4447
- Enumerated
- Mar 27, 2008
- Record last updated
- Oct 9, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (714) 543-4488
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 1633 E 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Toby McCarthy, LMFTMarriage & Family Therapist1366459067
- Heather Morrissette-Flores, BS,MS, IMFMental Health Counselor1801942727
Verify Chun K. Ryu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A25717Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average psychiatry physician in 2024
691 Medicare Part D claims for 13 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Clozapine62 claims
- Quetiapine Fumarate60 claims
- Olanzapine52 claims
- Benztropine Mesylate44 claims
- Divalproex Sodium Er36 claims
- Haloperidol Lactate31 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: $36.28
2 payments; by number, the most common kind was food and beverage; the largest payer was Alkermes, 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.
Chun K. Ryu among 8,673 psychiatry physician records in California
Chun K. Ryu, 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 2008, is newer than 52% of them.
- NPI issued2008 · 52% of these records are older, 43% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2008 · 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
- Maria Castillo Flores, MDSanta Ana, CA 927011922055987
- Sara Chiu, M.D.Santa Ana, CA 927011639496730
- Weiming Chu, M.D.Santa Ana, CA 927011114189529
- Patricia De Marco Centeno, MDSanta Ana, CA 927011164676169
- Lester Goldstein, M.D.Santa Ana, CA 927011326001900
- Christopher Heitland, M.D.Santa Ana, CA 927011619089349
- Andrew Inglis, M.D.Santa Ana, CA 927011902860778
- Phillip Jun, M.D.Santa Ana, CA 927011346203668
Common questions
What is Chun K. Ryu, M.D.'s NPI number?
Chun K. Ryu, M.D.'s National Provider Identifier (NPI) is 1972775252, issued on Mar 27, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Chun K. Ryu, M.D. located?
The NPPES record lists a practice address at 1633 E 4TH St, Santa Ana, CA, 92701. Phone: (714) 543-4447. Providers update this record themselves, so call before visiting.
How can I verify Chun K. Ryu, M.D.'s license?
NPPES lists California license number A25717, 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 Chun K. Ryu, M.D. prescribe under Medicare Part D?
In 2024, Chun K. Ryu, M.D. had 691 Medicare Part D claims for 13 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.