Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Denis P O'Brien, MD

Individual provider Orthopaedic Surgery Physician · NPI 1427053339

Denis P O'Brien, MD is an Orthopedic Surgery in Olney, Maryland. Graduated from Georgetown University School of Medicine in 1983, 43 years ago. Practices with Amber Hill Physical Therapy Inc, a 333-clinician group and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
43
Trained at
Georgetown University School of Medicine
Licensed in
MD
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3414 Olandwood Ct
Olney, MD 20832-1384
Phone: (301) 774-0500
Fax: (301) 774-1186
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence D0042989 (MD)

Record details

NPI number1427053339
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 16, 2005
Last updated in NPPESNovember 23, 2009
Mailing address3414 Olandwood Ct, Olney, MD 20832-1384

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolGEORGETOWN UNIVERSITY SCHOOL OF MEDICINE
Graduated 1983 (43 years in practice)
Group practice Amber Hill Physical Therapy Inc — 333 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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