Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Diane Witkowski
Nurse Practitioner in Frederick, MD · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720483456
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Registry record
Entity type Individual (Type 1)
Name Diane Witkowski
Sex Female
Practice address 617 W Patrick St, Frederick, MD, 21701
Phone (240) 405-8084
Enumeration date Oct 23, 2014
Last updated in NPPES Jun 13, 2025
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License R186991 (MD) Primary
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
What is the NPI number for Diane Witkowski?
The National Provider Identifier (NPI) for Diane Witkowski is 1720483456, a Type 1 (individual) record in the CMS NPPES registry.
Where does Diane Witkowski practice?
The practice location on file with NPPES is in Frederick, MD. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Michael Knable Psychiatry Physician · Frederick, MD NPI 1033133087 Annie Quinlan Professional Counselor · Frederick, MD NPI 1184031718 Caroline Cantrell Clinical Social Worker · Frederick, MD NPI 1467855007 Jason Moehringer Psychologist · Frederick, MD NPI 1841650678 Toovly Health Inc Intellectual and/or Developmental Disabilities Community Based Residential Treatment Facility · Frederick, MD NPI 1326816083 Pelvrx Physical Therapy Clinic/Center · Frederick, MD NPI 1831919539
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-13.