Individual
MARK J. O'CONNOR
Active
Sole proprietor
No
Provider details
NPI number
Gender
Man
Credential
M.D.
Contact information
Practice address
100 HOSPITAL RD, LEOMINSTER, MA 01453-2253
(978) 466-2052
(978) 466-2085
Mailing address
PO BOX 415348, BOSTON, MA 02241-5348
(800) 225-8885
Taxonomy
Speciality
Code
Description
License number
State
207RC0000X
Cardiovascular Disease Physician
Primary
277574
MA
Other
Other identifiers
Code
Description
Identifier
Issuer
State
05
—
110103978A
—
MA
Enumeration date
05/24/2012
Last updated
09/10/2025
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