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

Mary K O'Callaghan DO PC

Organization Internal Medicine Physician · NPI 1467650614

Mary K O'Callaghan DO PC is an Internal Medicine Physician in Ludington, Michigan. Licensed in Michigan. Registered with an NPI since 2007.

Licensed in
MI
In the registry since
2007
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

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Practice location Address checks out

922 Lawndale St
Ludington, MI 49431-1928
Phone: (231) 845-7380
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 009391 (MI)

Record details

NPI number1467650614
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mary O'Callaghan — Physician · (231) 845-7380
NPI enumeratedJuly 10, 2007
Last updated in NPPESMarch 7, 2023
Mailing address922 Lawndale St, Ludington, MI 49431-1928

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