Considering the current US health care system, Rheumatologist oncall and Dr Diana is an unbelivable miracle!!! If you do not believe, please read my mom's experiences below. My mon, in her 70s, came to US to visit my family. Due to the covid pandemic, she could not return home. Unfortunately, she started building pains in multiple joints, such as ankle, knee, elbow, shoulder, etc, such symptoms progressed very quickly and severly. My mom could not walk without the help of walker in a very short time. Her symptoms cannot be relieved with acupuncture, plaster, heating pad. So, I know this is something severly, based on my limited medical knowledges, I suspected that my mom probably has rheumatoid arthritis based on her symptoms, and it was demonstrated with some blood lab works, which showed high level of CCP factor, high level of sedimentation rate, and high level of C reactive protein, which was ordered online and no health insurances needed with self pay.The tougher situation stared from there, where my mom could be treated??? My mom visited me without health insurance. Even with it, as you know, to get RA treated, you need to find a general doctor, he/she can refer you to a RA specialist, and you need to wait at least several months to see the RA doctor. Have to say, this makes no sense, but unfortunately it is a typical process. For RA patients, it is a terribly wrong process. RA can progress very fast, it attacks not only joint, but also lung, heart ,and other organs, with couple of months of wait, patient can be severely damaged and this process may be irreversible. Even though, such further damage may not happen, how can a patient stand with such pains daily?It is lucky for me to find rheumatologist oncall and Dr. Diana through internet. Diana is very professional and works very fast and effectively. She cares about my mom's overall health conditions, not only RA. After more lab tests, she prescribed medicine for my mom with thorough assessment of her past medical history. There are several kinds of generic medicines which can deal with RA, Diana made a careful choice to select from them in order to prevent from triggering severe side effect. Even though the medicine she prescribed is not expensive and not very strong regarding to suppressing the overwhelming immune reaction for RA, it is very effective for my mom's condition, her pain, swelling, numbness in her joints have significantly alleviated, she can walk for a distance without walker now. All this happened just in 4 months since she started with the treatment with Diana. If there were no Rheumatologist oncall and Dr.Diana, my mom even could not have seen a RA specialist in 4 months even with health insurance.I highly recommend Dr. Diana and her business -- Rheumatologist oncall, for the treatment of immune disorder diseases, such as RA, such diseases can progress very fast, at least, you need some fast action to deal with them, Thanks, Dr.Diana!