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    Denis O'Brien, MD

    5.0 (3 reviews)
    Closed 8:30 am - 5:00 pm

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    David B Harding, MD

    David B Harding, MD

    3.3(15 reviews)
    0.6 mi

    Good old -fashion Doctor who takes a genuine interest in his patients health and well being…read more Reminds me of the turn-of the century type of doctor who used to make house calls. Has a calming demeanor. Does not treat patients like a number but asks AND REMEMBERS individual life events. My family used to go to his office in Mt Airy but closed it a few years ago. We felt so comfortable with Dr. Harding that we decided to follow him to the Olney office which is 30 minutes away. I do agree with the other reviewer, to a degree, that Dr. Harding is quick to prescribe medicine that sometimes treats the symptoms and not always the root cause. This may be an overly-compassionate desire to relieve discomfort in his patients. In any case, I believe everyone has to be their own health care advocate by asking lots of questions or have someone to act in that capacity. I was impressed to learn that Dr. Harding shares his time and talents with others who are less fortunate by financing his own mission trips abroad to assist patients in under-privileged countries who cannot afford or do not have access to modern health care. This speaks volumes to his compassion. My only other complaint is that I cannot remember the offices hours which are consistent week to week but not standard day-to-day -- but that is my issue as I cannot instantly the office hours for any given day but instead have to reference it. But that is a minor inconvenience and more of a burden on my memory than anything else.

    I've been going to Dr. Harding's office for about 15 years now and, while I did not have issues for…read morethe most part, I have had some really negative experiences that have caused me to seek my medical care elsewhere. I've been prescribed medication that I have a contraindication for (and they knew about the contraindication as I had seen them about that as well). I've also had Dr. Harding call to let me know that my results were back with nothing to worry about, and then had the admin staff call me later to talk about the surgery I would need. I've also had issues with the radiology people screwing up my test prep, causing a 20 minute procedure to instead take 2 hours! While I understand the radiology people are not part of his office, they are part of the care team.

    Medstar Montgomery Medical Center - Bug closeup

    Medstar Montgomery Medical Center

    2.2(163 reviews)
    0.7 mi

    I took my mom here after a recommendation from the wonderful doctor at medstar urgent care in…read moreWheaton. Wait time is to be expected, hospital visits are not a quick in and out. From the beginning, everyone greeted us with a smile, were kind and polite. The waiting room was relatively empty and quiet (it was the day after thanksgiving, so maybe this had something to do with it). We were called several times for different tasks (bloodwork, X-rays, ct scans). Every nurse and doctor attending my mom was gentle and kind. We were admitted to a room where again, the nurse was exceptional. The room was clean and again, the whole area was very calm and quiet. Our nurse was Nurse Cheryl. Our doctor was Dr. Eric and he was absolutely wonderful! I cannot say enough good things about him. He answered all our questions and attempted to speak Spanish to my mom as well. In the end, we left feeling satisfied and confident that we were taken care of in the best way. Thank you to the essential and professional nurses and doctors. We appreciate ALL you do!!!

    I have been trying to schedule a cardiology appointment for the past 10 days. Each time I call, the…read moreautomated system puts me on hold for about 10 minutes with music and service announcements, and then the call disconnects. There is no option to reach a live person, and it has become extremely difficult to speak with anyone or make an appointment. Frankly, the current phone system is worse than what existed 20 years ago--at least then you reached a real person or received a busy signal. This experience is unacceptable for a medical facility, especially for cardiology where timely care matters.

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    Denis O'Brien, MD - physicians - Updated May 2026

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