The Abstract examines a civil case regarding the death of patient Mr.S., born in 1952, in the State Healthcare Institution of the Moscow Region, admitted receiving planned surgical care with a diagnosis of  “ Primary bilateral coxarthrosis”. Upon admission in 2017, he was examined and prescribed surgical treatment - total hip replacement surgery. As follows from the copies of medical documents submitted for examination, Mr.S. was hospitalized in the State Budgetary Healthcare Institution of the Moscow Region in 2017 on a planned basis with a diagnosis of “Primary bilateral coxarthrosis”, which is confirmed by the conclusion of commission №1 of 2017, as well as the results of X-ray studies. Upon admission, he was examined, and scheduled surgical treatment was prescribed - right hip replacement. In this case, only on the day of surgery, the diagnosis of “Primary right-sided coxarthrosis” was supplemented by concomitant diseases: Type 2 diabetes mellitus, moderate severity, subcompensation. Acromegaly. Producing pituitary tumor. Gout. These diagnoses, as concomitant, should have been indicated upon admission to the hospital. Mr.S. had a relative contraindication to surgery - grade III obesity, but the doctors did not assess the patient's excess weight. All patients with morbid obesity should be assessed for the possibility of difficulties with laryngoscopy and tracheal intubation. Later, the surgeon's diary and preoperative medical summary indicate blood pressure figures of 120/80–130/85 mm Hg. This means that the treatment regimen for arterial hypertension Mr.S. was inadequate, and before the planned operation the attending physician needed to adjust the treatment by selecting the necessary drugs in the correct dosage. The efficiency and quality of medical care directly depend on the high level of qualification of the doctor, competent tactics of patient management, considering special attention to standards, clinical recommendations while maintaining treatment regimens and an individual approach to each patient, considering concomitant pathologies.