Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Rainbow Chung-Ou, MD, A Professional Corporation

Family Medicine Physician in Chino Hills, CA · enumerated 2022 · authorized official Rainbow Chung-Ou, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1811640980

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Registry record

Entity type Organization (Type 2)

Legal business name Rainbow Chung-Ou, MD, A Professional Corporation

Practice address 4195 Chino Hills Pkwy Ste H, Chino Hills, CA, 91709

Phone (909) 597-7817

Fax (909) 597-7984

Enumeration date Jan 30, 2022

Last updated in NPPES Jan 30, 2022

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Rainbow Chung-Ou

Title Owner

Phone (909) 597-7817

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Rainbow Chung-Ou, MD, A Professional Corporation located?

The practice location on file with NPPES is in Chino Hills, CA.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2022-01-30. Verify at npiregistry.cms.hhs.gov.

Providers at this address

Browse all →

Hung Kang Ou Family Medicine Physician · Chino Hills, CA NPI 1942219944 Rainbow Chung-Ou Family Medicine Physician · Chino Hills, CA NPI 1811282650

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-30.