Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Catherine E. Semenoff, N.P
Surgery Physician in Washington, DC · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720355845
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Catherine E. Semenoff
Credential N.P
Sex Female
Practice address 110 Irving St Nw, Washington, DC, 20010
Phone (202) 877-7347
Fax (202) 877-7302
Enumeration date Nov 17, 2011
Last updated in NPPES Nov 17, 2011
Taxonomy & licenses
NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority.
About the NP 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.
Frequently asked questions
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.
What specialty is Catherine Semenoff?
Catherine Semenoff is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Autumn Graham Emergency Medicine Physician · Washington, DC NPI 1578567012 Robert Linton Emergency Medicine Physician · Washington, DC NPI 1932109857 Emil Cohen Vascular & Interventional Radiology Physician · Washington, DC NPI 1952303356 Donna Norris Family Nurse Practitioner · Washington, DC NPI 1265422877 Alan Ost Diagnostic Radiology Physician · Washington, DC NPI 1144210758 Anette Virta-Paras Diagnostic Radiology Physician · Washington, DC NPI 1508856147 Ai-Hsi Liu Diagnostic Radiology Physician · Washington, DC NPI 1780674382 Arnold Raizon Diagnostic Radiology Physician · Washington, DC NPI 1649260266
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-11-17.