Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ian L Mclean, MBCHB PHD FACP FRCP

Q: What is the NPI number for Ian Mclean?

The National Provider Identifier (NPI) for Ian Mclean is 1306047378, a Type 1 (individual) record in the CMS NPPES registry.

Rheumatology Physician in South San Francisco, CA · enumerated 2007 · practices at Arun Villivalam, MD., Inc..

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

National Provider Identifier

1306047378

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Registry record

Entity type Individual (Type 1)

Name Dr. Ian L Mclean

Credential MBCHB PHD FACP FRCP

Sex Male

Practice address 1 Dna Way, Genentech, South San Francisco, CA, 94080

Phone (650) 467-3356

Enumeration date May 29, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 18732 (OK) Primary

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 Ian Mclean?

The National Provider Identifier (NPI) for Ian Mclean is 1306047378, a Type 1 (individual) record in the CMS NPPES registry.

Where does Ian Mclean practice?

The practice location on file with NPPES is in South San Francisco, 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 2007-07-08.