1. Thomsen Lisa MD

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    Glendora, CA

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    Thomsen Lisa MD

    3.7 (26 reviews)

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    9 months ago

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    1 year ago

    Great doc. Doctor Thompson always makes time to hear my issues. Always willing to talk things through. Great proactive physician.

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    5 years ago

    Best doctor ever! Listens and takes in consideration what you have to say and be a part of your own care. Very thorough. Responsive office.

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    Ask the Community - Thomsen Lisa MD

    Review Highlights - Thomsen Lisa MD

    Lisa Thomsen, MD is a Family Medicine Specialist* in Glendora, CA and has many years of experience in the medical field.

    Mentioned in 2 reviews

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    Alas Medical Clinic

    Alas Medical Clinic

    2.0
    (4 reviews)
    2.1 mi

    If I had to sum up my experience in a few honest words they would include, sweet staff, ill…read moreequipped, and unhelpful. Aside from the staff not being able to help coordinate with my insurance (not entirely their fault), they failed to mention they would not be able to get me a simple tetanus shot as they do not carry on hand before I arrived half a week after making an appointment. When the doctor asks why I came to see him apparently " because I haven't seen a physician in 4 years and I just found out I have to leave the country in two days for a few months and I want to make sure I'm not dying" wasn't a very good excuse as his questions were " do you feel sick anywhere?" ..."no?" ..."Okay thank you for coming in" To convince them to even take simple blood test or anything at all being an incredulous uphill battle In again explaining,"I just want to make sure there is something wrong that's obvious" Not to mention their understanding in how schedules worked as the doctor felt that casually strolling in at 11:25am for a 10:15am appointment was perfectly acceptable. And when they did receive simple test result the day before I left the country their policy of disclosing the information to me is only possible with me coming back to the clinic as they cannot be discussed on the phone. Using the phrase "I understand you are leaving the country sir but if you can't find it in your schedule to come on in we can't tell you". (Not how schedules work) However it was acceptable for their practice to put the phone on hold and ask the doctor standing right beside them if it's okay to tell me anything at all, to where he was Insistent it is not possible to tell me if anything is wrong enough for me to need to come back in. Again, very friendly staff. But will not recommend and will not return.

    The doctor and the staff were amazing. Doctor Alas saved me so much money since I have blue shield…read morePPO. No Co-pay either. They even do blood analysis and urine test here, so you don't have to drive somewhere else like other clinics just to get a blood analysis for your job or school. They were able to see me within 4-5 days. The doctor totally explained everything and was kind enough to go over what shots i needed and etc... I needed to get 4 shots in one day, and this nurse gave it to me like I haven't felt anything. True professionals.

    Castellanos Family Practice

    Castellanos Family Practice

    3.9
    (158 reviews)
    3.4 mi
    Established in 2003
    Available by appointment

    I used to see Dr. Castellanos when I was a kid with my mom, roughly between the ages of…read more12-15(2004-2007). Now as an adult I've realized how horrendous of a doctor he was. Our family eventually stopped seeing him after 3 years of being under his care. We went to him because it was hard to find doctors who spoke Spanish in our area at the time. I'll start with the worst. My mom used to be really concerned for her health. Over time we realized her concerns were signs of what she's now developed, diverticulitis and other digestive issues. She often came in with pain and explained her concerns. Dr. Castellanos would tell my mom that she was fine and to take ibuprofen. Any time she came in it was the same thing even though her symptoms progressed - continue to take ibuprofen. Eventually she told my mom she was too worried and was a bother. We finally stopped going to see him when she used the restroom and found blood in her stool. She developed ulcers in her throat and stomach that were very painful when eating. After we stopped going to see him we found out all of her symptoms were the beginning of diverticulitis. In 2009 she ended up going to the ER because she was heavily bleeding when she used the bathroom. A diverticula had burst open and it was discovered she has 3 total that had developed. She was taken to emergency surgery. She's suffered through diverticulitis ever since with multiple ER visits. Dr. Castellanos was negligent as a doctor when presented with symptoms. He could have referred her to a gastroenterologist but never did. We had HMO at the time and eventually switched to PPO but it was after dealing with him. For my own case, I developed gastro issues around 12 and realized I had sensitivity to certain foods that lead to a lot of gas and odd noises in my intestines. I felt shy about it as a kid but was worried because I didn't want to sit in class having those noises come from my intestines because well... it was awkward. My side of the classroom could hear my gas issues and I didn't understand what was causing it. When I told him he blew me off and told me to eat more fiber. I didn't bother more about it or ask because I was too ashamed to ask more. Years later I realized I had food sensitivities and that I need to be careful to avoid dairy. All of this to say - I would absolutely NEVER recommend anyone to see Dr Castallanos. My mom could have sued him for negligence but decided not to. Seeing him still in practice now and talking to family about health made me 20 years later have to go back to write this.

    I've been a patient at this office for years, and this was by far the most disappointing experience…read moreI've had. I received a call from the front desk today 4/8/2026 after I left my office visit regarding an additional charge for my consult I had paid $120 because I chose to visit their office while my new insurance kicks in, and the way it was handled was completely unprofessional. Instead of clearly explaining the reason for the extra $80 cost, the staff member came across as demanding and dismissive--as if I was supposed to already know their internal policies. At no point during my visit was I informed that discussing my symptoms could turn the appointment into a higher-cost consult. What made matters worse was the tone of the conversation. It felt like I was being blamed for the appointment running longer, which is unfair. Patients rely on medical staff to guide the visit appropriately--it's not our responsibility to manage time or determine billing classifications. There also seems to be a lack of internal communication and organization. If expectations, pricing, and visit structure were clearly communicated upfront, situations like this could easily be avoided. I asked to speak to the office manager because, yes, I had every right to be upset. Instead of taking accountability , apologizing, I was met with defensiveness--and then banned. Banned for speaking up after being treated poorly, advocating for myself. That tells you everything you need to know about how this office handles concerns. There is a serious lack of communication, organization, and basic respect here. If expectations and pricing were explained upfront like they should be, none of this would have happened.

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    Thomsen Lisa MD - familydr - Updated July 2026

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