Rainbow Chung-Ou, M.D.
Family Medicine Physician · Chino Hills, CA
Rainbow Chung-Ou, M.D. is a family medicine physician with a practice address in Chino Hills, California, and NPI 1811282650, issued on Jun 9, 2011. Check the license (California A122366, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rainbow Chung-Ou
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A122366 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4195 Chino Hills Pkwy Ste H, Chino Hills, CA 91709
- Phone
- (909) 597-7817
- Enumerated
- Jun 9, 2011
- Record last updated
- Jul 23, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20140904001827); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 2011
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 4195 Chino Hills Pkwy Ste H
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hung Kang Ou, MDFamily Medicine Physician1942219944
Verify Rainbow Chung-Ou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A122366Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% more Medicare Part D claims than the average family medicine physician in 2024
6,889 Medicare Part D claims for 459 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 286 claims were for opioids.
Most prescribed
- Atorvastatin Calcium445 claims
- Amlodipine Besylate256 claims
- Metformin Hcl252 claims
- Losartan Potassium219 claims
- Lisinopril201 claims
- Simvastatin183 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: $559.95
24 payments; by number, the most common kind was food and beverage; the largest payer was Pfizer Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Rainbow Chung-Ou among 17,133 family medicine physician records in California
Rainbow Chung-Ou, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 63% of them.
- NPI issued2011 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2011 · median 2005 among the 10,652 with a school on file
- Record last updated2018 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
23 family medicine physician records list a practice address in Chino Hills
They are 23 of the 774 NPPES records with a practice address in Chino Hills, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Chino Hills → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Saman Aboudi, MDChino Hills, CA 917091831112820
- Ryan Agena, MDChino Hills, CA 917091891877395
- Tiffany Anderson Terrell, DOChino Hills, CA 917091629188404
- Carlos Baez, MDChino Hills, CA 917091225038961
- Ashish Bhalla, MDChino Hills, CA 917091184701104
- Gary Fontan, MDChino Hills, CA 917091760482731
- Benny Guzman, M.D.Chino Hills, CA 917091710988035
- Ofelia Narvasa, M.D.Chino Hills, CA 917091558404558
Common questions
What is Rainbow Chung-Ou, M.D.'s NPI number?
Rainbow Chung-Ou, M.D.'s National Provider Identifier (NPI) is 1811282650, issued on Jun 9, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Rainbow Chung-Ou, M.D. located?
The NPPES record lists a practice address at 4195 Chino Hills Pkwy Ste H, Chino Hills, CA, 91709. Phone: (909) 597-7817. Providers update this record themselves, so call before visiting.
How can I verify Rainbow Chung-Ou, M.D.'s license?
NPPES lists California license number A122366, 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 Rainbow Chung-Ou, M.D. prescribe under Medicare Part D?
In 2024, Rainbow Chung-Ou, M.D. had 6,889 Medicare Part D claims for 459 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.