Mary Callahan, D.O

NPI 1518968882 · on the registry since 2005 · sole proprietor

Practice

Address: 68a Route 6a
Post Office Box 1757
Sandwich, MA 02563
Phone: (774) 413-5457
Fax: (773) 413-5985
Organisation at this address: Cardiovascular Associates Of Sandwich
Cardiovascular Associates Of Sandwich, Llc
Inferred from a shared address, not stated in the registry.
Clinicians at this address: 2

Registry record

Primary taxonomy: 207RC0000X
207RC0000X
Licence states on file: MA
From the registry's licence fields, which are often incomplete.
Sex: Female
Record last updated: 2026-06-26

Source: CMS National Plan and Provider Enumeration System. Registration is not the same as practising, and the registry records no retirement — some people listed here no longer practise. More in Massachusetts