Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Margaret Hennessey, PA

Individual provider Medical Physician Assistant · NPI 1982116414

Margaret Hennessey, PA is a Physician Assistant in Saint Louis, Missouri. Graduated from Medical University of South Carolina College of Medicine in 2017, 9 years ago. Practices with SSM Health Care Group, a 923-clinician group and accepts Medicare assignment.

Years since qualifying
9
Trained at
Medical University of South Carolina College of Medicine
In the registry since
2017
What do these letters mean?
PA — Physician Assistant
A licensed clinician who examines, diagnoses and treats under a physician's supervision.

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Practice location Address checks out

3635 Vista Ave
Saint Louis, MO 63110-2539
Phone: (314) 577-8000
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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

Record details

NPI number1982116414
Entity typeIndividual (Type 1)
GenderFemale
Credentials PA
Sole proprietorNo
NPI enumeratedOctober 24, 2017
Last updated in NPPESOctober 24, 2017

Medicare enrollment

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

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolMEDICAL UNIVERSITY OF SOUTH CAROLINA COLLEGE OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Ssm Health Care Group — 923 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 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 59 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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. Those with a page here are linked.

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at SSM Health Care Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 923 clinicians in the practice; 12 are shown here.

Other providers in Saint Louis