Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mary Helen Hanessian, MD
Psychiatry Physician in Athens, OH · enumerated 2009.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508003294
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Registry record
Entity type Individual (Type 1)
Name Mary Helen Hanessian
Credential MD
Sex Female
Practice address 90 Hospital Dr, Athens, OH, 45701
Phone (740) 593-3682
Fax (740) 593-8659
Enumeration date Jan 16, 2009
Last updated in NPPES Nov 30, 2015
Taxonomy & licenses
2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 35-127047 (OH) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
What is the NPI number for Mary Hanessian?
The National Provider Identifier (NPI) for Mary Hanessian is 1508003294, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mary Hanessian practice?
The practice location on file with NPPES is in Athens, OH. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → Robby Wyatt Psychiatry Physician · Athens, OH NPI 1982693867 William Resch Psychiatry Physician · Athens, OH NPI 1174514004 Tri-County Mental Health & Counseling Services, Inc Mental Health Clinic/Center (Including Community Mental Health Center) · Athens, OH NPI 1538148945 Benjamin Jordan Child & Adolescent Psychiatry Physician · Athens, OH NPI 1457331845 Leslie Abromowitz Child & Adolescent Psychiatry Physician · Athens, OH NPI 1215969621 Bruce Jones Psychiatry Physician · Athens, OH NPI 1588671051 Mark Mcgee Psychiatry Physician · Athens, OH NPI 1073524351 David Schenkelberg Professional Counselor · Athens, OH NPI 1326152828
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-11-30.