Cook & Siu PC
NPI 1780852129 · Internal Medicine Physician · Waldorf, MD
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cook & Siu PC is a Internal Medicine Physician organization in Waldorf, MD (NPI 1780852129).
Provider details
- NPI number
- 1780852129
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Richard Cook, Owner(301) 472-9240
- License
- D0063483 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
18 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Richard E Cook, MD
Registry dates
- Enumerated
- 2008-02-20
- Last updated
- 2024-07-13
- Certified
- 2024-07-13
Frequently asked questions
- What is Cook & Siu PC's NPI number?
- Cook & Siu PC's National Provider Identifier (NPI) is 1780852129, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Cook & Siu PC?
- Cook & Siu PC is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Cook & Siu PC located?
- Cook & Siu PC's practice location on file with NPPES is 3450 Old Washington Rd Ste 103, Waldorf, MD 20602-3249.
- What is Cook & Siu PC's phone number?
- The practice phone number listed in the NPPES registry for Cook & Siu PC is (301) 472-4290.
- Does Cook & Siu PC accept Medicare?
- Cook & Siu PC is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Cook & Siu PC?
- The authorized official listed on Cook & Siu PC's NPPES record is Richard Cook, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Cook & Siu PC's NPI active?
- Yes — Cook & Siu PC's NPI (1780852129) is active in the NPPES registry as of the last update on 2024-07-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.