Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David Daniel Wishart Twa, MD, PHD, FRCPC, DABP

Anatomic Pathology Physician in Palo Alto, CA · enumerated 2025.

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

National Provider Identifier

1710878632

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Registry record

Entity type Individual (Type 1)

Name David Daniel Wishart Twa

Credential MD, PHD, FRCPC, DABP

Sex Male

Practice address 300 Pasteur Dr, Palo Alto, CA, 94305

Phone (604) 729-5934

Enumeration date Jul 10, 2025

Last updated in NPPES Aug 18, 2025

Taxonomy & licenses

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License MD6162821 (WA) Secondary

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License A204311 (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 specialty is David Twa?

David Twa is registered in NPPES with the primary taxonomy of Anatomic Pathology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-18.