Psychiatrist

Dr. Mary Margaret Hennessy, M.D.

1000 N Oak Ave, Marshfield, Wisconsin, 54449-5703

About Dr. Mary Margaret Hennessy

Dr. Mary Margaret Hennessy is a psychiatrist based in Marshfield, Wisconsin who is specialized in Psychiatry. Active license number of Dr. Mary Margaret Hennessy is 56027 for Psychiatry in Wisconsin. Her current practice location is 1000 N Oak Ave, Marshfield. Patients can contact her at 715-387-5511. Dr. Mary Margaret Hennessy, M.D., specializes in Psychiatry and her NPI number (Unique professional ID assigned by NPPES) is 1104980119.

Dr. Mary Margaret Hennessy specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Practice Information

Dr. Mary Margaret Hennessy's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name Dr. Mary Margaret Hennessy
Specialization Psychiatry
Credentials M.D.
Gender Female
Practice Address: 1000 N Oak Ave,
Marshfield, WI - 54449-5703

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

NPI Number1104980119
NPI Enumeration Date: 21 Dec, 2006
NPI Last Update On: 16 Sep, 2011

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for Dr. Mary Margaret Hennessy are as mentioned below.

License NumberSpecializationStateStatus
56027Psychiatry WisconsinPrimary
33238Psychiatry MinnesotaSecondary
33238Child & Adolescent Psychiatry MinnesotaSecondary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

Dr. Mary Margaret Hennessy
1000 N Oak Ave,
Marshfield, WI - 54449-5703
Phone: 715-387-5511

Book an Appointment with Dr. Mary Margaret Hennessy

To schedule an appointment, contact Dr. Mary Margaret Hennessy at 1000 N Oak Ave, Marshfield, Wisconsin or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Mary Margaret Hennessy:

Dr. Mary Margaret Hennessy is a psychiatrist specializing in Psychiatry. She specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Yes, Dr. Mary Margaret Hennessy is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

Dr. Mary Margaret Hennessy practices at 1000 N Oak Ave, Marshfield, Wisconsin, 54449-5703.

To schedule an appointment with Dr. Mary Margaret Hennessy, please contact the office at 715-387-5511.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.