Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Chi Mong Christopher Or, MD

Q: What is the NPI number for Chi Mong Or?

The National Provider Identifier (NPI) for Chi Mong Or is 1639676000, a Type 1 (individual) record in the CMS NPPES registry.

Ophthalmology Physician in Stanford, CA · enumerated 2018.

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

National Provider Identifier

1639676000

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Registry record

Entity type Individual (Type 1)

Name Chi Mong Christopher Or

Credential MD

Sex Male

Practice address 300 Pasteur Dr, Stanford, CA, 94305

Phone (650) 723-4000

Enumeration date Apr 11, 2018

Last updated in NPPES Nov 21, 2025

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License A172845 (CA) Primary

207WX0108X Uveitis and Ocular Inflammatory Disease (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License A172845 (CA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

What is the NPI number for Chi Mong Or?

The National Provider Identifier (NPI) for Chi Mong Or is 1639676000, a Type 1 (individual) record in the CMS NPPES registry.

Where does Chi Mong Or practice?

The practice location on file with NPPES is in Stanford, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-21.