Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William R Frederick MD PC

Organization Internal Medicine Physician · NPI 1841471588

William R Frederick MD PC is an Internal Medicine Physician in Washington, District of Columbia. Licensed in District of Columbia, Maryland and Virginia. Registered with an NPI since 2007.

Licensed in
DC, MD, VA
In the registry since
2007
Specialties on file
3
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

106 Irving St NW Ste 304 South Tower
Washington, DC 20010-2927
Phone: (202) 291-6423
Fax: (202) 291-0691
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Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 4502 (DC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 0101051734 (VA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 00007970 (MD)

Record details

NPI number1841471588
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official William Frederick — Owner · (202) 291-6423
NPI enumeratedNovember 23, 2007
Last updated in NPPESJune 2, 2009
Mailing address106 Irving St Nw, Suite 304 South Tower, Washington, DC 20010-2927

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