Provider headshot

William R. O'Brien, MD

Specialties
Internal Medicine, RheumatologyRheumatology
Accepting New Patients
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Location
Pentucket Medical
1 Park Way
Haverhill, MA 01830
US
(978) 521-3200(978) 521-3200
(978) 469-5663(978) 469-5663

Hours:

Day of the WeekHours
Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM
SaturdayClosed
SundayClosed
Pentucket Medical
323 Lowell Street
Andover, MA 01810
US
(978) 783-5000(978) 783-5000
(978) 313-8076(978) 313-8076

Hours:

Day of the WeekHours
Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM
SaturdayClosed
SundayClosed
Pentucket Medical
500 Merrimack Street
Lawrence, MA 01843
US
(978) 557-8900(978) 557-8900
(978) 557-8867(978) 557-8867

Hours:

Day of the WeekHours
Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM
SaturdayClosed
SundayClosed
Pentucket Medical
260 Merrimac Street
Newburyport, MA 01950
US
(978) 499-7400(978) 499-7400
(978) 499-7327(978) 499-7327

Hours:

Day of the WeekHours
Monday9:00 AM - 5:00 PM
Tuesday9:00 AM - 5:00 PM
Wednesday9:00 AM - 5:00 PM
Thursday9:00 AM - 5:00 PM
Friday9:00 AM - 5:00 PM
SaturdayClosed
SundayClosed
About William O'Brien
Provider Gender
MALE
Languages Spoken
  • English
Specialties
Internal Medicine, Rheumatology
Rheumatology
NPI
1043483837