Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Katherine Williams, PA-C
Physician Assistant in Boston, MA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1922795699
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Katherine Williams
Credential PA-C
Sex Female
Practice address 725 Albany St, Ste 3b, Shapiro Bldg, Boston, MA, 02118
Phone (617) 638-8485
Fax (617) 414-7372
Enumeration date Apr 21, 2023
Last updated in NPPES May 9, 2026
Taxonomy & licenses
363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 9258 (MA) Secondary
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 035816 (NY) Secondary
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA9258 (MA) Primary
363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 9258 (MA) Secondary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 110199336A | Medicaid | MA | - |
| 3141060 | Medicaid | NH | - |
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
Where does Katherine Williams practice?
The practice location on file with NPPES is in Boston, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Katherine Williams?
The National Provider Identifier (NPI) for Katherine Williams is 1922795699, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Ricardo Munarriz Urology Physician · Boston, MA NPI 1861464927 Linda Ng Urology Physician · Boston, MA NPI 1831161991 David Wang Urology Physician · Boston, MA NPI 1558333260 Victoria Churchill Physician Assistant · Boston, MA NPI 1629735790 Jessa Sahl Student in an Organized Health Care Education/Training Program · Boston, MA NPI 1972252344 Cecilia Liu Physician Assistant · Boston, MA NPI 1194459313 Bruna Pino Student in an Organized Health Care Education/Training Program · Boston, MA NPI 1760242317 Ruchir Chaturvedi Student in an Organized Health Care Education/Training Program · Boston, MA NPI 1093501140
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-09.