The questionable department of Morozov Children's Hospital began its operations in January 1903. The building for this department was one of the first constructed in the hospital complex according to the design of architect I.A. Ivanov-Shitz. It is located in the central part of the complex, behind the Outpatient Building and in front of the departments for patients with measles and acute infections.

In pre-revolutionary Russia, "questionable" referred to patients for whom doctors could not confidently determine the presence or absence of infection. To prevent the development and spread of disease, such patients were placed in quarantine, and special departments were created for them in hospitals.

The questionable department, located behind the Outpatient Building where initial examinations were conducted, accommodated 18 beds. The building had 9 wards, two bathing rooms, two buffets, and 4 toilets. If necessary, the building could be divided into 4 separate departments with individual entrances. The layout of the single-story building was symmetrical: two side wings connected by a central part with a corridor and wards. The floors in the rooms were made of oak parquet, and the height of the rooms was 3.5-4.5 meters. The building was equipped with electricity and central heating.

Above the central part of the building rose a small attic, and the facade was adorned with two tall chimneys. The side walls were blind and marked by powerful buttresses, with small attics above the roof. Old blueprints show porches with metal canopies over the entrances.

In 1961, the building was raised to two stories, significantly altering its exterior appearance and internal layout. At that time, a boxed department and wards for 40 beds were placed in it.