Chun Ryu, M.D.
NPI 1972775252 · Psychiatry Physician · Santa Ana, CA
Chun Ryu, M.D. is a Psychiatry Physician provider in Santa Ana, CA (NPI 1972775252).
Provider details
- NPI number
- 1972775252
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A25717 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
18 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 62 |
| Quetiapine Fumarate | 60 |
| Olanzapine | 52 |
| Benztropine Mesylate | 44 |
| Divalproex Sodiumbrand: Divalproex Sodium Er | 36 |
| Haloperidol Lactate | 31 |
| Prazosin Hcl | 29 |
| Gabapentin | 22 |
| Olanzapinebrand: Olanzapine Odt | 21 |
| Haloperidol | 21 |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$36 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-03-27
- Last updated
- 2008-10-09
Frequently asked questions
- What is Chun Ryu's NPI number?
- Chun Ryu's National Provider Identifier (NPI) is 1972775252, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chun Ryu's specialty?
- Chun Ryu is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Chun Ryu located?
- Chun Ryu's practice location on file with NPPES is 1633 E 4th St, Santa Ana, CA 92701-5163.
- What is Chun Ryu's phone number?
- The practice phone number listed in the NPPES registry for Chun Ryu is (714) 543-4447.
- Is Chun Ryu's NPI active?
- Yes — Chun Ryu's NPI (1972775252) is active in the NPPES registry as of the last update on 2008-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.