Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Jan S Williams, ACNP, APRN, BC
Nurse Practitioner in Manassas, VA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1548320492
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Registry record
Entity type Individual (Type 1)
Name Mrs. Jan S Williams
Credential ACNP, APRN, BC
Sex Female
Practice address 8640 Sudley Rd Ste 302, Manassas, VA, 20110
Phone (703) 369-5959
Fax (703) 369-7473
Enumeration date Dec 11, 2006
Last updated in NPPES Feb 18, 2025
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 0024166796 (NC) Primary
APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists.
About the APRN 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
What is the NPI number for Jan Williams?
The National Provider Identifier (NPI) for Jan Williams is 1548320492, a Type 1 (individual) record in the CMS NPPES registry.
Where does Jan Williams practice?
The practice location on file with NPPES is in Manassas, VA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Ara Maranian Cardiovascular Disease Physician · Manassas, VA NPI 1821076142 Solomon Bagae Cardiovascular Disease Physician · Manassas, VA NPI 1104842061 Sarah Duncan Acute Care Nurse Practitioner · Manassas, VA NPI 1306134218 David Demaria Cardiovascular Disease Physician · Manassas, VA NPI 1043553852 Raza Yunus Cardiovascular Disease Physician · Manassas, VA NPI 1225475973 Rodeline Dalge Adult Health Nurse Practitioner · Manassas, VA NPI 1316356728 Bhisham Harchandani Interventional Cardiology Physician · Manassas, VA NPI 1417341850 Kristy Diffley Family Nurse Practitioner · Manassas, VA NPI 1154828150
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-18.