RICHARD E COOK, MD
NPI 1780852129
Internal Medicine in Waldorf, MD
About Richard E Cook, Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RICHARD E COOK, MD (NPI 1780852129) is a healthcare organization registered as an internal medicine in Waldorf, Maryland and active in the NPI registry since February 2008. The organization lists Richard E Cook, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Richard E Cook, Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
2Medicare enrollment records show 2 clinicians reassign Medicare billing to Richard E Cook, MD, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.
Clinicians, nearest first (2)
Waldorf, MD 20602
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Cook & Siu PC's NPI number?
The NPI number for Cook & Siu PC is 1780852129. It was assigned to this organization in the NPPES registry on February 20, 2008. The provider is doing business as Richard E Cook, MD.
Where is Cook & Siu PC located?
Cook & Siu PC is located at 3450 Old Washington Rd Ste 103, Waldorf, MD 20602. The listed phone number is (301) 472-4290.
What is Cook & Siu PC's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Cook & Siu PC enrolled in Medicare?
Yes. Cook & Siu PC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Cook & Siu PC?
According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Internal Medicine, reassign their Medicare billing to Cook & Siu PC. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Cook & Siu PC was last updated on July 13, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Richard E Cook, Md · NPI 1780852129
Internal Medicine organization in Waldorf, Maryland. Organization record, active in the CMS NPPES registry since February 20, 2008.
## Identity
- **NPI:** 1780852129 (Entity type: Organization)
- **Enumerated:** February 20, 2008
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **Legal business name:** Cook & Siu Pc
- **Organization subpart:** No
- **Authorized official:** Richard Cook, OWNER
## Practice location
- **Address:** 3450 OLD WASHINGTON RD STE 103, Waldorf, MD 20602-3249
- **Phone:** (301) 472-4290 · **Fax:** (240) 607-3609
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 2 clinicians (Internal Medicine) reassign Medicare billing to this organization (form CMS-855R); 1 practice at this address and 2 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 13, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1780852129) · Data from the CMS NPPES public registry.