Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexandra Ruan, MD

Anesthesiology Physician in Stanford, CA · enumerated 2016.

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

National Provider Identifier

1891158804

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Registry record

Entity type Individual (Type 1)

Name Alexandra Ruan

Credential MD

Sex Female

Practice address 300 Pasteur Dr, Stanford, CA, 94305

Phone (650) 723-6661

Fax (650) 498-6205

Enumeration date Mar 29, 2016

Last updated in NPPES Apr 11, 2024

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License A150975 (CA) Primary

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 Alexandra Ruan?

The National Provider Identifier (NPI) for Alexandra Ruan is 1891158804, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alexandra Ruan practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-11.