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

Dr. Mary Margaret Hennessy, MD

Individual provider Psychiatry Physician · NPI 1104980119

Dr. Mary Margaret Hennessy, MD is a Psychiatry Physician in Marshfield, Wisconsin. Licensed in Minnesota and Wisconsin. Registered with an NPI since 2006.

Licensed in
MN, WI
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 N Oak Ave
Marshfield, WI 54449-5703
Phone: (715) 387-5511
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 56027 (WI)
Psychiatry Physician Taxonomy 2084P0800X · Licence 33238 (MN)
Child & Adolescent Psychiatry Physician Taxonomy 2084P0804X · Licence 33238 (MN)

Record details

NPI number1104980119
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 21, 2006
Last updated in NPPESSeptember 16, 2011

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