Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark Lee, MD, PHD

Q: What is the NPI number for Mark Lee?

The National Provider Identifier (NPI) for Mark Lee is 1881738003, a Type 1 (individual) record in the CMS NPPES registry.

Medical Oncology Physician in Palo Alto, CA · enumerated 2007.

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

National Provider Identifier

1881738003

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Lee

Credential MD, PHD

Sex Male

Practice address 875 Blake Wilbur Dr, Palo Alto, CA, 94304

Phone (650) 723-7621

Enumeration date Feb 19, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License A75891 (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

Where does Mark Lee practice?

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

What is the NPI number for Mark Lee?

The National Provider Identifier (NPI) for Mark Lee is 1881738003, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.