Important Information for Coronavirus (COVID-19)
If you think you have been exposed to COVID-19 and develop a fever and symptoms, such as cough or difficulty breathing, please contact your provider before visiting the health care facility.
Provider headshot

William R. O'Brien, MD

Specialties
Internal Medicine, Rheumatology
Accepting New Patients
Request an Appointment
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
NPI
1043483837