Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Linn, MD

Pediatrics Physician in Oakland, CA · enumerated 2006.

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

National Provider Identifier

1821058793

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Registry record

Entity type Individual (Type 1)

Name Michael Linn

Credential MD

Sex Male

Practice address 3100 Telegraph Ave, 2nd Floor, Oakland, CA, 94609

Phone (510) 452-5231

Fax (510) 869-6679

Enumeration date Mar 24, 2006

Last updated in NPPES Nov 15, 2012

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A56337 (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

Is NPI 1821058793 active?

Yes, as of the latest NPPES snapshot, NPI 1821058793 is active (record last updated 2012-11-15).

How do I verify Michael Linn's NPI record?

Cross-check NPI 1821058793 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-11-15.