Katherine Williams, PA-C
Physician Assistant · Boston, MA
Katherine Williams, PA-C is a physician assistant with a practice address in Boston, Massachusetts, and NPI 1922795699, issued on Apr 21, 2023. Check the license (Massachusetts PA9258, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katherine Williams
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License numbers
- PA9258 MA
9258 MA
035816 NY
Self-reported in NPPES; status is on the state search - Practice location
- 725 Albany St, Ste 3B, Boston, MA 02118
- Phone
- (617) 638-8485
- Enumerated
- Apr 21, 2023
- Record last updated
- May 9, 2026
- Fax
- (617) 414-7372
- Medicaid IDs
- 110199336A MA
3141060 NH - Medicare enrollment
- Enrolled (PECOS I20260609000328); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,713 in Massachusetts → Look up another NPI →
Also registered at 725 Albany St, Ste 3B
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katherine Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license PA9258Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average physician assistant in 2024
658 Medicare Part D claims for 178 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Tamsulosin Hcl195 claims
- Finasteride155 claims
- Myrbetriq74 claims
- Gemtesa60 claims
- Trospium Chloride38 claims
- Doxazosin Mesylate26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Katherine Williams among 4,713 physician assistant records in Massachusetts
Katherine Williams, PA-C is one of 4,713 physician assistant records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 75% of them.
- NPI issued2023 · 75% of these records are older, 17% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2022 · median 2019 among the 3,217 with a school on file
- Record last updated2026 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,660 physician assistant records list a practice address in Boston
They are 1,660 of the 41,865 NPPES records with a practice address in Boston, and 4,713 physician assistant records in Massachusetts.
All 4,713 in Massachusetts → Every provider in Boston → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Susan Bowler, PA-CBoston, MA 021181295812048
- Jennifer Czarniak, PABoston, MA 021181528050259
- Sandy Falcon, PA-CBoston, MA 021181275619033
- Barbara Furgal, PA-CBoston, MA 021181568556454
- Eric Haas, PABoston, MA 021181144312174
- Cynthia Kiang, PA-CBoston, MA 021181811974116
- Nina Lev, P.A.Boston, MA 021181568421923
- Elizabeth Marks, PA-CBoston, MA 021181396761169
Common questions
What is Katherine Williams, PA-C's NPI number?
Katherine Williams, PA-C's National Provider Identifier (NPI) is 1922795699, issued on Apr 21, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Williams, PA-C located?
The NPPES record lists a practice address at 725 Albany St, Ste 3B, Boston, MA, 02118. Phone: (617) 638-8485. Providers update this record themselves, so call before visiting.
How can I verify Katherine Williams, PA-C's license?
NPPES lists Massachusetts license number PA9258, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Katherine Williams, PA-C prescribe under Medicare Part D?
In 2024, Katherine Williams, PA-C had 658 Medicare Part D claims for 178 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.