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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

Patient comments (10)

The overall average patient rating of Dr. Denis O'Brien is Good. Dr. O'Brien has been reviewed by 14 patients who have provided 10 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 6 areas:
  • Hip Osteoarthritis
  • Hip Surgery (Hip Replacement Arthroplasty)
  • Knee Osteoarthritis
  • Knee Surgery (Knee Replacement Arthroplasty)
  • Osteoarthritis (Hand and Wrist)
  • Sports Medicine

Education & Awards

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

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


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 5 office locations.
Dr. Denis O'Brien practices Orthopaedic Surgery and Surgery near Olney, MD.
Additional practice locations include: Silver Spring, MD and Columbia, MD.
See Olney Orthopedic Surgeons and Olney Surgeons.