Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Katherine Siobhan Rivest, PA-C

Individual provider Medical Physician Assistant · NPI 1164766226

Katherine Siobhan Rivest, PA-C is a Physician Assistant in Easthampton, Massachusetts. Qualified in 2012, 14 years ago. Practices with Western Mass Physician Associates Inc, a 71-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
14
Licensed in
MA
In the registry since
2012
What do these letters mean?
PA-C — Physician Assistant, Certified
A physician assistant who holds current national certification.

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Practice location Address checks out

2 Mechanic St Ste A
Easthampton, MA 01027-1562 Not confirmed with CMS for 10 years — call before visiting
Phone: (413) 529-9282
Fax: (413) 527-7526
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Physician Assistant (primary) Taxonomy 363AM0700X · Licence PA4575 (MA)

Record details

NPI number1164766226
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA-C
Sole proprietorNo
NPI enumeratedNovember 15, 2012
Last updated in NPPESJanuary 12, 2016

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice Western Mass Physician Associates Inc — 71 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients50
Services billed 62 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Western Mass Physician Associates Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 71 clinicians in the practice; 12 are shown here.

Other providers in Easthampton