Peter M Rosenberg, MD

I found him calm and extremely patient. He listens to you and wait until you explain yourself completely regarding your problem. Then after you’re done talking, he would tell you what the appropriate tests needed to take. Most doctors rather have you come to the office and pay an office visit in order to get an order form but with him I shoot him an email and he would have my test order ready.
Every time I send him an email he would respond back on the same day. What the doctor. He is an amazing doctor. I would recommend him to anyone. He is listed on
web as one of the best.

Feel very lucky to have Dr Rosenberg and his staff

OK — updating my review. I get it, Dr. Rosenberg is awesome and worth the wait. I went in with paperwork with recent procedures and blood work and then he proceeded to give me sooooo much information on those findings, which is more than what my other doctors have done and is what I need to know! I need to be an active participant in my healthcare, I don’t like blindly going along with something, so I appreciate that Dr. Rosenberg took the time to get into the dirty details. I spent about 40mins with him, he was very thorough, very easy to talk to, and more importantly, just because he’s not quite sure what’s ailing me, he didn’t make me feel like I was lying or are a hypochondriac. So far he seems willing to figure out what this mystery illness is and I feel comfortable that he will. Even though the appointment wait time is a little annoying, once you’re a patient, you will be able to email the Doctor directly, and if he feels like you need to be seen earlier, the office will make it happen, so that makes up for the wait.

I was initially diagnosed by Jumi Mok, Nurse Practitioner and then Dr. Rosenberg.
Dr Rosenberg is a knowledgeable awesome Doctor. He performed an Sigmoidoscopy and was able to determine my condition with a pathology report. The office staff are also very helpful with anything that is needed. Simply, Dr. Rosenberg and staff are the best in the business.
DO NOT GO ANYWHERE ELSE.

I’ve seen Dr. Rosenberg 3 maybe 4 times. I really, really appreciate his friendly and engaging personality. He’s easy to talk to, he has a sense of humor. He’s very gentle and takes time to explain everything.
I’ve never seen him and felt he was in a rush or a hurry. One of his nurses at the Pasadena Endoscopy Center said, «He makes smart decisions». I was impressed by that.
His office staff? Certainly there is room for improvement. They could not find any evidence that I had seen him before even though I had at least twice! That was troubling. Other than that though, I recommend him.

This review is based only on the office itself, the receptionist, and the general practice, not Dr. Rosenberg’s personality or medical efficacy as a gastroenterologist. I was very much looking forward to having Dr. Rosenberg as my new gastroenterologist after moving from Chicago to Pasadena. However, the process of trying to get a new patient appointment with him was a nightmare. I called on a Thursday, left a message with the office voicemail (as no one would answer even though it was 10:00am), and then I never heard back. After a week, I called again — same thing. I left another message, again stating my name and phone number and that I was looking for a new patient appt with Dr. Rosenberg and hadn’t hear back in a week since my first call.
I received a voicemail that night, which I responded to the following morning — same thing!!! I left another message, and this time I thankfully got a call back within the next 20 minutes. I spoke with the receptionist, who was at first very nice, though she did not apologize for the 1+ weeks of waiting. She got all my information, emergency contact, etc. Then at the very end of the conversation, after wasting a good 15 minutes of my time, she asked me what kind of Anthem BlueCross insurance I have. I responded that I have a PPO, and she asked if the plan had been purchased through the Covered California marketplace. I said yes, and she responded with «Ohhh, we don’t take any of THOSE policies.» I clarified several times: «You mean even if it is a regular PPO that already existed before 2014?» She simply stated «Yes, we don’t accept any plans purchased through Covered California. Especially if your insurance card has the Covered California logo on it, we don’t accept it.»
WTF? Seriously? Does their office have a problem with the new insurance exchange system in general? My PPO is the exact same as PPO plans that Anthem has been offering for years, but now suddenly that I purchased it through Covered CA, I’m no longer good enough to be their patient? And why does their office not think that this is just maybe important enough to 1. State this policy on their website, and 2. Tell new patients this UP FRONT at the beginning of the phone conversation when scheduling a new appointment??? Ridiculous! All of this left a really bad taste in my mouth and made me really angry with the whole process. I’m sorry, Dr. Rosenberg, I’m sure that you personally are a really good doctor, but you need to seriously address this issue with your overall office and practicing partners. When several MILLION people are now getting PAID individual insurance policies through Covered CA (not talking MediCal, but everyday people like me — entrepreneurs, small business owners, students, etc), this is a big issue. And I feel like fellow Unilocalers should know this in advance and not have to waste their time as I did.

Very professional and courteous. I’m a young guy and he didn’t believe that I needed a colonoscopy but after some tests and family history he booked the appt. Thanks God I did it because it turns out I had precancerous polyps on my colon.
I’ve had three colonoscopys and this was one of the easiest experiences. The Pasadena endoscopy center was easy to deal with and Dr Rosenberg was easy going and very knowledgeable. I’ll be back here every five years for the foreseeable future.

Dr. Rosenberg is a wonderful doctor. He has a wonderful, warm personality and puts his patients at ease quickly. He has helped me so much in the 5 years I have been seeing him.
He is the BEST.

Finally a doctor that listens and cares about his patients. Very pleased with time spent in diagnosing and exploring all possible causes of symptoms. Great communication skills and not pretentious despite his impressive background.

I don’t normally make it a habit of rating doctors on Unilocal,but having found Dr. Rosenberg BECAUSE of Unilocal,I felt it appropriate.
Dr. R is my kind of doctor: attentive, informed, not quick to jump to invasive methods of exploration (ahem! and given his specialization, this is mas importante). I can also tell by the way he responds to all of my questions that he is up to date on all the latest.
I think ella j. put it beautifully: it is a «real doctor-​patient» relationship and you will feel truly heard. Hopefully you won’t have to find yourself in a specialist’s office, but if you do, you won’t go wrong with Dr. Rosenberg.

I was sad to have to find a new gastroenterologist when I moved out of LA. Dr. Rosenberg listens, and communicates clearly and sincerely. We had a real doctor-​patient relationship! Imagine that! He was very attentive and gave me excellent care. I highly recommend him if you have Crohn’s or Ulcerative Colitis.