Danger! Danger! Danger! Do not visit Dr. Rita Mukherjee at the Oncology Institute located at 6450 Medical Center Street in Las Vegas, NV. I don't know if she was having a bad day but she argued with me that I dont have several medical conditions, many of which she's known i have had for several years while under her care. Today she outright argued with me saying I don't have the medical conditions nor did she EVER tell me I have Cancer. Yet, after she got her head out of the fog she was in and read my prior test results, she then says yes I do have cancer? I see many doctor for many reasons, she is the only one that tried to tell me she knows more about body than I do! She is a definite quack! Please use your BEST judgement and DO NOT let her mess around with your health. Just stay away from her and see a more qualified professional. I will DEFINITELY NEVER go back to that business again read more

I was referred to this office when my ins dropped the Dr I was getting treatment thru last January. I wasn't able to get an appt w this office till March. It's now December and to date I have received absolutely no treatment for my cancer even tho the latest PET scan showing it's metastasized 75% since May. They lost my results twice which entailed my having to get another scan and then sent me to a radiation oncologist who said he couldn't treat me due to the metastasis. I then went back to IOH to be told I needed genetic testing to see if I qualified for immunotherapy . I did not. After that someone called asking how I wanted to handle my $600+ copay. I'd never had any copay. I told them I wasn't prepared to pay it. A few days later someone else called and asked if I needed financial assistance. I said yes and they told me to come to the office and fill out an app. I did so wi the week. Abt 2 weeks later someone called asking when I was going to return the application for financial aid. Advised them that I had already done that and turned it in to the front desk. She the asked was I sure I turned it in. Could it still be at my house? Advised her that I came to the office and filled it out in the waiting room. They finally found it. Within days a box was delivered to my home that I needed to sign for. When I opened it, it was the immunotherapy drug Keytruda. Dr Valladeres had told me I had no genetic markers for immunotherapy and was not a candidate. Called the office twice and spoke w 3 ppl asking what I should do w the drug that I now had in my fridge! No one has an answer but they still said it shouldn't have been shipped to me. (They're the ones who filled out that portion of the app not me). Called Merck pharmaceutical and they instructed me to take it to the office and to get a receipt. Did so. In the meantime, it's now been a yr since I received any treatment for my cancer which has now metastasized into my lymph system ands has gone from 1 metastatic node to 4. I have gone untreated for an entire yr!!! Every time I tried to book an appt I either couldn't get thru, was told the scheduling system was down but that a nurse would call me wo 24 hrs, (one ever called once out of 3xs being told that they would), or they couldn't schedule an appt for me till my copay was satisfied which was for the Keytruda that I cannot have anyway. When I explained that i had been approved for financial assistance thru Merck they said they had not been notified. Found out later from an employee that when the Keytruda arrives at the office it automatically triggers the system to allow me to schedule an appointment however bc it went to my house, that never happened. So here I sit w metastatic lymph nodes not being treated for an entire yr. I finally called and asked for a callback via the leader on their phone system. Someone called me back wi 30 mins today and I was able to schedule an appt wa diff dr at a diff location. I hope and pray the office on Medical Center Dr is more competent than the one on N Tenaya. I have nothing bad to say about Dr Valladeres but like my GP said, "A Dr is only as good as his staff." If the office staff at the new location isn't more on the ball I'm probably going to die from perfectly survivable cancer. read more

The Doctor s are incompetent, I don't even know if they know anything about cancer or if they are licensed as Doctors in NV . The only good thing there is the nurses . The Nurses are extremely competent professional kind . I almost died from getting the wrong dose or type of chemotherapy there . It's scary having cancer and then having an incompetent cancer doctor that really doesn't know too much about cancer is very scary. . read more

Dr. Rita has been helpful in a way during my mom's treatment but there's a blonde lady with glasses that works up front from time to time - never wants to help. Information provided by her is always incorrect or seems bothered when you ask her for help. Every time I ask the same question to someone else I get another answer even the nurses in the back have said she does not know what she is talking about. They really need to talk to her about her attitude and that's the only one I always have an issue with any other receptionist has been nice and gives the correct information or AT LEAST TRYS TO HELP in some way. Yesterday my mom had a appointment understandable we were late had to reschedule for a 5-10 min talk with the doctor but OKAY and my mom made sure to tell her to reschedule her for next day if there was somebody to help with Spanish even a co worker next to her told her she wouldn't be here to help and she still didn't care and scheduled my mom WELL my mom Showed up today and she had to reschedule because there was nobody there to help! This is ridiculous and unfair to the client they are already going through so much with chemo, radiation to still have the wrong information given . read more

My husband needed antibiotic infusion treatments here at this office on TENAYA. They NEVER called him! Then he tried to call 4x with NO return phone call!~! What is wrong with this place? read more

I have been coming to the North Tenaya office for over a year , am seeing Dr. Valladares. He is an excellent doctor... I am quite pleased with him ... He listens, and hears you.... he offers his knowledge to better your health .... read more

I want to start off by saying the front office staff are very nice, I truly feel for them because the Doctors, nurses, and care coordinators are the absolute worst in Healthcare that I have ever seen. My first visit the nurses never asked me any of the new patient questions and they used a template on the computer from the previous patient (with wrong pronouns) so when I got my letter of clearance for a much needed heart surgery I found this error and demanded immediate correction. That was first issue that caused me to start digging further. Next my NP ran 14 blood test to which she only reviewed the ones I already provided the results to that another Dr. ran. I believe this falls under fraud and a waste of money. The other tests indicate other serious issues but she doesn't seem to give a damn about my wellbeing so why bother looking. Then after meeting with my neurologist I find out that I do in fack have a history of blood clots and ask if now I should be taking another medication, this dummy responds with, patient denys having history of blood clots continue with baby aspirin. And I'm here like well the documents I just provided your dumb ass shows I do in fact have a history of blood clots but okay I'll continue taking the baby aspirin and if I have another blood clot I'll sue you. The care coordinator is not helpful and is angry because I wanted my medical records to reflect what my symptoms and history were oh and my correct pronouns so she doesn't like me much and tries as hard as she can to be as unhelpful as possible. The phone lines never go to the office its always the answering service and no one ever calls you back. Absolute worst care ever and its a lawsuit waiting to happen. I have to wait until January to find a new Dr. because my current insurance only covers this provider for Hematology period isn't that lovely. Someone please shut these people down before they kill someone. read more

I received a referral from my insurance for this place and had been trying since Feb. 28, 2026 to get an appointment let alone talked to a person. First tried the leave a text and someone will get back to you in 24 hours. It being Friday, someone should have called back on Monday. didn't happen. Tried text again on Mar. 9,2026, once again no response. Today I called from my house phone and after 26 minuets I was hung up on. Just call your Insurance company and ask for a new referral. These people don't care what happens to you. read more

My mom had vaginal radiation with this Dr and she tells me that is not gentle at all. Also she recently had extreme vaginal infection and was in serve pain. She couldn't sit and could barely walk. I made an appointment hoping he could help her but all he had was guesses of what might be going on, he ended up ordering a ct and a pet scan that stuff can take weeks to get done. No help with the serve pain nor did he seem concerned. Right out of his office we went to the ER where they confirmed she had a bad cellulitis infection that spreads fast, she had to stay in the hospital to get treated. Dr Jones is not a caring Dr and often doesn't have answers read more

Feels like you are all alone Dr. RITA Says she will do something and it doesn't get done, the only good this is the nurses in the back that does the treatments. The billing department is the WORST!!! Please check your statements, that is all iam going to say on that. read more

This was the worst oncology office I have been too. Lack of communication, which starts from the top (office manager) Larry all the way down to Dr. Valladares. You call to make an appointment or to ask questions and there is never a telephone response. This practice is out for your money and your insurance money only. The office and staff doesn't give 2cents about helping the patients get treatment and care they deserve. They just string you along. Would not recommend this office or doctors to anyone, because there is NO Hope & Innovation this office and staff provides to sick patients. read more

I am sick and getting worse, and this is supposedly the only place my insurance wants me to go, but it has been weeks trying to get in touch with them to make an appt and still no answer, call back, or reply to the contact form I have filled out 6 times now. Definitely not wanting to rely on them for cancer help. read more

No masks on anyone aside from the intake nurse. While the staff is extremely polite and friendly -- on the phone and in person -- it seems there are frequent issues with scheduling, etc; I ended up rescheduling because I wanted to see the specific doctor my primary care physician recommended. read more

Everything needs improvement! Should have had treatment yesterday. Got there, seen the doctor for 2 minutes and returned to waiting room to wait and was then told, oh we don't have a nurse today so they have to call and schedule. I asked the front office to schedule it, and was told only the nurse could schedule. What kind of service is that! They were supposed to call yesterday, nope, nothing. When I called today I was told they could not send a new message because there was already one in the system. Again, what kind of nonsense is that! So, so disappointed with the whole experience with this company. Their advertising is absolutely WRONG! read more

Office experience has been terrible. My first visit, the office opened 25 minutes late. Second visit, 45 minutes after my scheduled appointment time the front desk staff says the practitioner isn't coming in and they just found out. Asked me and several other patients, one having difficulty waking, to reschedule. Completely unprofessional, lack of courtesy or empathy. Find another clinic for your needs, this place should not be open. They don't seem to take their clinic or patients serious. read more

No one hardly ever answers the damn phone. Honestly, it's not that hard! Pick up, say hello. Easy! I call my Oncologist office, a Specialist, cancer, pretty important, and they don't believe in picking up the phone and putting ppl on hold so instead, ppl are getting ringing FOR A HALF HOUR! Ridiculous. I would have been Sooo Fired back in my day at work. Very poor for a business to handle their business like that. read more

YOU WILL DIE BEFORE YOU GET EVEN THE BASIC LEVEL OF INFORMATION OR CARE FROM THIS OFFICE. YOU WILL SPEND YOUR LAST DAYS/THE LAST DAYS OF YOUR LOVED ONE FIGHTING ON THE PHONE WITH THIS OFFICE. YOU WILL RECEIVE PROMISES OF HELP- BUT RECEIVE NONE! Sadly 1 star is the lowest this review will allow me to give. Our interactions with this Dr office and office staff has been a disaster from the beginning. The Dr stated that he would send her orders for blood work and scans as a STAT. The resulted in waiting 3 weeks for him to finish his notes so that we could get the necessary orders. While we were waiting for my mother in laws orders she ended up going in to the hospital, where they requested the same scans. I fought for almost a month with the office staff for the correct billing code for Simon Med Imaging. I spent countless hours and phone calls trying to coordinate between the Imaging facility and the Dr office. Simon Med Imaging stated they couldn't get any phone calls returned from the Dr office to get the correct billing codes. I called repeatedly, even tried to 3 way call with both offices to get this resolved. I went to the Dr office and they refused to answer the door -AS THEY LOOKED AT ME FROM THE FRONT DESK- because their lunch break started in 2 minutes. My mother in law ended up waiting 3 weeks for the Dr to finish his notes, we spent a month trying to get the correct billing codes, countless hours making phone calls and 3 ER visits with 2 weeks in the hospital - ALL BEFORE ANYTHING GOT ACCOMPLISHED with the Drs office. She spent her last days in hospice and passed away never having received the orders or billing code. Then they had the audacity to send us a bill for 2 no show appointments- 1 appointment she was in hospice and the other appointment she had been gone for 2 1/2 weeks already. By the way- I called and left a message to cancel both appointments, but per usual they never called me back. Thank you for making our last month and a half with her even more stressful. Thank you for being incompetent and literally unable to do the simplest part of your job so she could have the necessary scans. Thank you for looking me in the eye and refusing to answer your door because you were 2 minutes away from lunch break starting. Thank you for refusing to return any phone calls. Thank you for making this entire horrible ordeal even more unbearable. In the future I will never allow one of my loved ones to have any interaction with this Dr or office. I will warn everyone about the incompetence of this office. YOU WILL DIE BEFORE YOU GET ANY HELP FROM THIS OFFICE! read more