Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Jessica A Macwilliams, PAC
Physician Assistant in Agawam, MA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1578663001
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Registry record
Entity type Individual (Type 1)
Name Jessica A Macwilliams
Credential PAC
Sex Female
Practice address 200 Silver St Unit 106, Agawam, MA, 01001
Phone (413) 341-5350
Fax (413) 341-5335
Enumeration date Sep 24, 2006
Last updated in NPPES Apr 13, 2026
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 002204 (CT) 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
Is NPI 1578663001 active?
Yes, as of the latest NPPES snapshot, NPI 1578663001 is active (record last updated 2026-04-13).
How do I verify Jessica Macwilliams's NPI record?
Cross-check NPI 1578663001 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Melanie Koumentakos Physician Assistant · Agawam, MA NPI 1295925956 Julia Fiore Medical Physician Assistant · Agawam, MA NPI 1215331384 Harmony Hopkins Family Nurse Practitioner · Agawam, MA NPI 1922522895 Christopher Rumplik Physician Assistant · Agawam, MA NPI 1144847286 Zoe Jacobson Medical Physician Assistant · Agawam, MA NPI 1568285716
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-13.