I have had nothing but bad experiences with this office. I had a sleep study and the technician was rude and inappropriate- I also have called MANY times with no return phone call. The office works with a third party supplier and on all occasions the office has not contacted the supplier in a reasonable amount of time and weeks have gone by while I waited for the office to return phone calls. Vanessa, in particular, has not returned calls and the office staff follows suit. I highly recommend if you want to work with a sleep doctor you contact one that is organized, knowledgeable and returns messages - I find their behavior to be, not only unprofessional but inept. I am sorry to report this, but it's been months since I first contacted them and two months later I still don't have my CPAP equipment sorted out due to their unprofessionalism. read more

I would avoid this office. As a patient, I should not have to correct their billing errors. When I specifically asked the office if they had a "prior authorization" from the insurance company to do the study. I would expect their answer to be truthful. The truthful answer was actually "your insurance company doesn't require a prior authorization." That is NOT what I was told. Anyone in the industry knows that response is a canned response from the insurance company, and if the office does not get some sort of auth number, someone is getting billed. Years later, I am getting billed by Dr. Mostafavi for about 5K. I have repeatedly called and asked for the prior authorization document. Just this week (9/25/2025), I learned that there is no prior auth document. The office should have known this routine ploy by the insurance company. I would NEVER have had the study if they had told me that they did not have an authorization number. Don't scam your patients; it is not right. If the office messes up on insurance preparations and doesn't communicate with the patient, then that error is on Dr. Mostafavi and his office. read more

Dr. Mostafavi went out of his way to make sure that my CPAP machine was covered and delivered. He is a great doctor and an exceptional person. Two thumbs way up for this man! read more

Dr. Mostafavi seems to be a thoughtful and nice doctor, but his billing system is seriously messed up. I tried repeatedly to pay online, to no avail, and then I tried to pay by phone, which also didn't work. Finally, I paid the total balance due by a check which cleared my bank on April 1. Then around June 1, two months later, I received a pre-collection letter! read more

Our family has been under Dr Mostafavi for decades. Karina and Venessa are best in customer care and handle patients needs with efficiency and accuracy. This leaves the first impression that you are in great hands. I can not speak enough Dr Mostafavi. He is extremely seasoned and knowledgeable. However what stands out the most is his care and compassion for his patients. Their office has recently moved to a new state of the art office in west Los Ángeles . Its easy access with ample parking. The best part of the office is that most of the services are under one roof including their brand new well polished sleep center. I recently had a sleep study done and it felt like 5 star hotel. I recommend Dr Mostafavi and his staff to everyone. read more

I don't know what I'm more upset about. What happened with this doctor's office, or that yelp removed my review. So since I can't modify it, I'll keep this short and sweet. * Was prescribed a new medicine that was hundreds of dollars a month with insurance despite my prior med working for over a decade. * Was told I have to have an appointment every month with the new med in order to get each month's refill. * When I tried to reach out and left several messages, the calls were never returned. * That is, until I left a negative yelp review. At which point they called me within minutes, and I was put back on my old medication and told the monthly appointment was only because I had been put on a new med and would no longer be needed. * After my first refill, I found out that no, this office was trying to make me have an appointment every month - at $40 a pop copay and hours of my time each month - to take a med I've been stable on for over a decade. My health held hostage. So I decided to find a more honest office. While searching around for a new doctor, I asked each one about the above. To a physician, I was told, "That's not normal" and one even suggested I consider filing a complaint. There is no need for me to go in monthly, pay the copay, because a doctor is holding a non-controlled very basic and common asthma med over my head to make me do so. They even said when they prescribe the newer medication, that's not suggested nor normal practice for it, neither. I found a new doc, got my script, and I'm on my way. And before this office reaches out again and tries to talk me out of keeping this post up like last time, know I won't answer your calls. You lied to me multiple times, you are engaging in what seems to be dishonest tactics to make extra percapita charges, you ignored my calls. This time it stays up. People need to know. And yelp, before you remove this, feel free to reach out. This is all true and I'd happily sign anything attesting to that fact. read more

Does not care about their patients they just care about what will make them the most money. They are completely unreliable and have completely missed scheduled appointments with no notice at all that are vital to health as they are the only ones who can prescribe Inhalers that keep patients alive. read more

I typically don't write reviews but this was one the worst experiences with a doctor. First, he's extremely arrogant & speaks over you. There is zero bedside manner and could care less about you or your symptoms. I specifically told him I want to avoid sleep medications and want to get to the root cause of my sleep problem. His response, "Then, why are you here?" The moment he said this, I was about to just walk out b/c at that point the whole thing was a waste of time. Every time I tried to speak about symptoms and the issues I'm having, he would cut me off and go on about his opinions. read more

I've had maybe one of the worst/weirdest ever experiences with this doctor. I went to see him a month ago. His office was in kind of disarray, very understaffed. No receptionist, just one nurse/assistant running everything. This person would check you in, take your paperwork, then also take your blood pressure. She seemed very stressed. Dr. Mostafavi showed up and he just opened the door of the room I was in to talk to the woman taking my blood pressure. No knocking, no nothing. What if I was naked? Even she apologized. Whatever. I meet with Dr. Mostafavi, he talks a good game but wears too much cologne. I tell him I was not happy with my last sleep doctor, he says he will take care of me and that I need a new sleep machine and to take a new sleep study. I tell him I am fine with all of that. He tells me that by Monday the sleep center will call me to schedule an appointment. Long story short, they never called me. He says the sleep center (which I believe he owns?) will also get me supplies. I never hear from them so I call Mostafavi's office and tell them. They have them call me. They ask me what supplies I need and what kind of machine and mask I have, etc. All kinds of questions. It's annoying because why didn't the doctor's office give them all this info? It's like they want me to do all the work. Anyway, I order supplies from them. They never come. A month later (today) I try to get ahold of Dr. Mostafavi's office and let them know all of this and the number no longer works. I feel like I am in the Twilight Zone. Doo-doo-doo. read more

My experience with Dr. Mostafavi has been the worst I have ever had with a doctor. I am not inclined to write bad reviews and I believe other patients should be aware of unethical practices. I have been suffering from sleep apnea for a while and I had no idea where to begin. After some calls and terrible customer service from his staff, I finally got an appointment. On my first appointment, he told me I needed a sleep study ASAP so that he could determine what type of treatment I needed. In the first place, I asked his secretary if she could help me find out if my insurance would cover that study and she told me that all the appointments and the study was fully covered that I had nothing to worry about, I only had to pay $30 for each doctor visit. I was referred to a sleep study clinic which is owned by Dr. Mostafavi, and they gave me an appointment after a month, long story short, I got connected to a CPAP machine and by the middle of the night they went to disconnect the machine, I asked the guy who was doing that how everything was going the study, he told me I had stopped breathing a couple of times and that that was a sign of really bad sleep apnea. After a few days, I went to bring my results to Dr. Mostafavi to find out what he would suggest for my sleep apnea. In his office upon reviewing my results, he says "you are perfectly fine your breathing is normal." I told him, "I didn´t think so" and shared with him what the therapist at the sleep clinic told me. He stares at me and starts YELLING "How many times have I told these guys not to say anything" Steps out his office with my files yelling at his staff while I was still sitting in his office without knowing what to do.... He comes back and says "you can leave now" go pay over there (pointing to the receptionist) ...I asked him to check me to make sure there was nothing wrong with my nose or my throat. Afterall I have all the symptoms of sleep apnea and you advised me what to do the CPAP study urgently. He was infuriated, stands in front of me, opens my mouth with a tongue depressor and said again, there is nothing wrong, nothing I can do for you. You can go pay now. A few weeks later I start getting bills from his office and from the sleep study center. Long story short I ended up paying about $1,200 dollars that my insurance didn´t cover (that included $136 extra dollars from the last consultation which I assumed was when he opened my mouth with the tongue depressant for less than 5 seconds.) After I few months I visited another respiratory doctor and told me the study from Dr. Mostafavi was inconclusive and the wrong test to be performed. He confirmed that I do have sleep apnea and with a mouth device the symptoms could be treated. Problem was solved. I hope Doctor Mostafavi enjoys his dirty money and that he soon finds a solution to his anger issues. read more

All I can say is just Dr Mostafavi is amazing and friendly . I had coughing and other doctors keep giving me medicine that never helped so I decid to visit Dr Mostafavi . He gave me all the necessary test such as blood and other tests and he find out I have an Asthma and I have to use different medicine. He was life savers my coughs are almost gone and I feel much better . I will come back for my sleep study test because I have problem when I sleep too much noise . read more

Doctor was very compassionate and kind. I was able to get an appointment a good time for my schedule. Would reccommend to my family and friends. Thank you so much!!! read more

Dr. Mostafavi is a very knowledgeable and caring Doctor. He is an expert in the field of Sleep Studies and has helped me with my sleep apnea. read more

I had another great visit with Dr. Mostafavi today; he continues to exceed our expectations with each visit. The efficacy of his treatment plan has been impressive to say the least, I feel great! I don't think I have trusted a doctor more than I trust Dr. Mostafavi which is significant for our family. read more

Dr Mostafavi is a tremendously knowledgeable doctor, he helped diagnose my husband's sleeping problems and is super knowledgeable and friendly! Gave him the best advice that is helping him to sleep better at night. Recommended!!! read more

After extensive searches to find an experienced and knowledgeable sleep specialist who is actually boarded in sleep( so many doctors are not but claim to be a sleep specialist) I was lucky enough to find Dr Mostafavi and turned out that he is a pioneer in this field and has been featured numerous times on local TV programs and CNN and Extra and other shows. My main concern was how he would deal with me since I've had many unsatisfactory encounters before, but I was very pleasantly surprised! He is extremely caring, knowledgeable and genuinely kind. I am so very happy to have found him and the least I could do for him is to write this review and let everyone know. read more

Dr. Mostafavi is great. I was frustrated with sleep apnea for a long time I searched a lot and found Dr. mostafavi. He treated my sleep apnea with CPAP machine and now I feel much better. I'm posting this review to let you know if you having sleep problems go to Dr. Mostafavi. read more

Dr. Mostafavi truly is a sleep expert. He helped out a family member that had sleep issues. Regular doctors couldnt help so I went to yelp and found him. We were able to make an appointment right away. The office is clean, staff is nice and plenty of parking next door. Once the doctor gives his initial assessment he also hires outside specialists to gather further in depth data. He takes a very wholistic approach and gets right down to the root. In this case, a sleep apnea diagnosis. He referred us out to a sleep center (which im not really a fan of, thats another story) and got a prescription for a cpap machine. Dr. Mostafavis diagnosis has been life changing and definitely added a few years of life. As you all know, sleep deprivation is very dangerous short term and long term. If you are having this issue, definitely go see him. Dont waste time, he ll change your life. Its LA so we have access to the top specialist doctors in the nation. Hes definitely one of them. read more

Dr Mostafavi is one of the most standoffish and contemptuous people I've ever met. He doesn't make eye contact with his patients, and doesn't even raise his head during the consultation, keeping his eyes on his desk and shuffling his paperwork with nonchalance. He seems to believe that he's superior to everybody and even speaks rudely to his own staff. Most importantly, he does not even care to do the job he's paid to do. I asked him about the side effects of a medication, and he told me to "google it". Mkay... read more

I have seen Dr. Mostafavi a few times now for sleep related issues. He always explains things thoroughly and clearly. He is very honest and straight to the point, but also very friendly and quite funny actually! I like how he explains the diagnosis then offers options so that the patient actually has a say in their treatment plan. You sometimes go in to specialists offices expecting the worst, but I always leave his office feeling happy, hopeful, and taken care of! The office staff is top rate as well. Don't hesitate booking an appointment with this doctor....he's very good! read more

Dr. Mostafavi is great to deal with. He is knowledgeable and has excellent bedside manners. Thank you!

I was suffering from a sever bronchitis in last two months. I went to a general physician but unfortunately he gave me wrong medicines! After that I decided to go to an expert to treat my situation. Dr Mostafavi was the person who diagnosed my illness correctly and treated it completely. He is by far the best doctors I have ever met ! Thank you! read more

Fabulous sleep doctor. Saved my husband's life. Sorted out his sleep issues in minutes. He got a good night's sleep for the first time in 30 years. The office staff is warm and welcoming--Ana is great. Very nurturing place. We've seen several sleep doctors. This guy is the best. read more