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Cook & Siu PC

Internal Medicine Physician in Waldorf, MD · enumerated 2008 · authorized official Richard Cook, Owner.

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

National Provider Identifier

1780852129

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Registry record

Entity type Organization (Type 2)
Legal business name Cook & Siu PC
Other name <Unavail>
Practice address 3450 Old Washington Rd Ste 103, Waldorf, MD, 20602
Phone (301) 472-4290
Fax (240) 607-3609
Enumeration date Feb 20, 2008
Last updated in NPPES Jul 13, 2024

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D0063483 (MD) Primary

Authorized official

Name Richard Cook
Title Owner
Phone (301) 472-9240

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.

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Frequently asked questions

Who is the authorized official for Cook & Siu PC?
NPPES lists Richard Cook (Owner) as the authorized official for this organization.
What is the NPI number for Cook & Siu PC?
The NPI for Cook & Siu PC is 1780852129, a Type 2 (organization) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-13.