Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Peggy Tun, M.D.

Pediatric Clinical & Laboratory Immunology Physician in Mountain View, CA · enumerated 2006.

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

National Provider Identifier

1689680100

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Registry record

Entity type Individual (Type 1)

Name Dr. Peggy Tun

Credential M.D.

Sex Female

Practice address 2490 Hospital Dr Ste 311, Mountain View, CA, 94040

Phone (650) 962-4690

Fax (650) 962-4694

Enumeration date Aug 1, 2006

Last updated in NPPES Aug 22, 2011

Taxonomy & licenses

2080I0007X Pediatric Clinical & Laboratory Immunology Physician Allopathic & Osteopathic Physicians · License G27696 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
GR0098530	Medicaid	CA	-

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

How do I verify Peggy Tun's NPI record?

Cross-check NPI 1689680100 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1689680100 active?

Yes, as of the latest NPPES snapshot, NPI 1689680100 is active (record last updated 2011-08-22).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-22.