1. Gregory H. Tchejeyan, MD

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    Thousand Oaks, CA

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    Gregory H. Tchejeyan, MD

    4.4 (23 reviews)
    Closed • 8:00 am - 5:00 pm

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    7 months ago

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    11 months ago

    Dr Tchejeyan is an outstanding doctor. He is professional and precise on his work. His staff are also professional and courteous.

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    1 year ago

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    3 years ago

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    2 years ago

    Great doctor. Great office staff. Very clean office . Very impressed. First time going.

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    2 years ago

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    2 years ago

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    Gregory T.

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    2 years ago

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    Gregory T.

    Thank you for your kind words. Your success is our happiness!

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    2 years ago

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    3 years ago

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    Gregory T.

    Thanks John for nice words. Happy you’re back doing what you love!!

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    4 years ago

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    7 years ago

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    6 years ago

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    8 years ago

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    7 years ago

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    13 years ago

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    10 years ago

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    11 years ago

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    Ask the Community - Gregory H. Tchejeyan, MD

    Review Highlights - Gregory H. Tchejeyan, MD

    “Tchejeyan replaced both my knees two months apart between August and November of 2022.”

    Mentioned in 12 reviews

    Read more highlights

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    Glenn D Cohen, MD - Removable cast

    Glenn D Cohen, MD

    4.5(106 reviews)
    2.5 mi

    Dr. Cohen spent a lot of time with me, and he put my mind at ease after a cut on my fingers. I had…read moreto pay out of pocket (and it's expensive), but it is worth it. He got me in last minute, and everyone in his office was punctual and nice. I am thankful for Dr. Cohen.

    The front desk receptionist needs a serious lesson in professionalism and basic courtesy. She is…read morelike a robot. A doctor's office should feel welcoming, respectful, and empathetic not like you're inconveniencing someone simply by being there. The front desk is the first point of contact for patients and families, and the way people are spoken to matters. There is no reason for a receptionist to come across as rude, dismissive, or entitled. You do not own the office, and treating people with kindness and respect is a basic part of working in a healthcare environment. What makes it even more disappointing is seeing the tone of some of the responses to reviews on this page. They certainly do not give the impression of a warm, patient-centered medical practice. People coming into a doctor's office may already be stressed, nervous, in pain, or dealing with difficult circumstances. A little empathy and professionalism at the front desk goes a long way.

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    Glenn D Cohen, MD - Glenn D Cohen D

    Glenn D Cohen D

    Glenn D Cohen, MD - Our amazing patient, Andre Carter, Former Professional Football Player and now the Defensive Line Coach for the Miami Dolphins

    Our amazing patient, Andre Carter, Former Professional Football Player and now the Defensive Line Coach for the Miami Dolphins

    Glenn D Cohen, MD - A couple of days after the accident in 2011.

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    A couple of days after the accident in 2011.

    Sumit H Rana, MD - Robotic-assisted Total Knee Replacement Right knee, outpatient

    Sumit H Rana, MD

    4.9(38 reviews)
    2.5 mi

    In 2025 I underwent total knee replacement surgery with Dr. Rana and had an outstanding experience…read more I researched many surgeons and chose him because he was the most highly recommended and he truly lived up to it. His skill, experience, and attention to detail are exceptional, and he has a cheerful, reassuring bedside manner. What impressed me most was how attentive he was after surgery, personally following up with me multiple times and genuinely caring about my recovery. The office staff and surgical team were excellent, and my surgery at Tarzana Hospital was a great experience. I am extremely grateful for the results of both surgeries and would highly recommend Dr. Rana to anyone considering knee replacement.

    I am officially six weeks out from a full hip replacement performed by Dr. Rana and his team, and…read moreif I could give more stars, I absolutely would. This has been one of the best decisions of my life. I'm a 43-year-old active male with a family history of hip issues. When I first met Dr. Rana and explained the two years of intense pain I had been dealing with, even during simple tasks like tying my shoes, he laid out my options with direct honesty, which I truly appreciated. Within 12 hours of agreeing to move forward with surgery, his team reached out, including a wonderful coordinator named Freddie. She walked me through every step of the process in detail and helped ease any nerves I had going into the procedure. Surgery day was a great experience. The entire staff was professional, supportive, and made everything feel seamless. Now, just six weeks later, I am pain-free and focused on rebuilding my strength so I can get back to doing the things I love. I cannot thank Dr. Rana enough for the impact he has had on my life. Truly grateful. Thank you.

    Gregory H. Tchejeyan, MD - sportsmed - Updated October 2026

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