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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

3.5
  •  
(11)
Patient comments (9)

The overall average patient rating of Dr. Denis O'Brien is Good. Dr. O'Brien has been reviewed by 11 patients who have provided 9 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.5
  •  
Promptness 4.1
  •  
Courteous Staff 4.3
  •  
Accurate Diagnosis 3.7
  •  
Bedside Manner 3.8
  •  
Spends Time with Me 3.3
  •  
Follows Up After Visit 3.5
  •  

Specialties & Research

  • He has special expertise in 5 areas:
  • Hip Osteoarthritis
  • Hip Surgery (Hip Replacement Arthroplasty)
  • Knee Osteoarthritis
  • Knee Surgery (Knee Replacement Arthroplasty)
  • Sports Medicine

Education & Awards

Dr. O'Brien graduated from Georgetown University, Washington. He has 2 awards.

Awards  
Castle Connolly's Top Doctors™ (2012 - 2013)
Patients' Choice Award (2013)

Affiliations

Dr. O'Brien has 2 hospital affiliations:

  • Montgomery General Hospital Inc 
  • Howard County General Hospital 

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Additional Information
Dr. Denis Peter O'Brien MD is a male Orthopaedic Surgeon, has 28 years of experience and practices in Orthopaedic Surgery and Surgery.
Where does Dr. Denis P. O'Brien practice?
Dr. Denis O'Brien has 4 office locations.
Dr. Denis O'Brien practices Orthopaedic Surgery and Surgery near Olney, MD.
Additional practice locations include: Silver Spring, MD and Ellicott City, MD.
See Olney Orthopedic Surgeons and Olney Surgeons.