The hospital grounds house two Infectious Disease Units. The building for one of them at Morozov Children's Hospital was constructed according to the design of architect I.A. Ivanov-Shits in the Art Nouveau style in 1903-1904, and the unit opened in 1905. This building completed the central row of pavilions of the hospital, located behind the Outpatient Building, the Doubtful Unit, and the Koryev Unit.

The Infectious Disease Unit was designed for 30 beds. Inside, there was a pavilion with 20 beds, one ward with 4 beds, and three wards with two beds each. The building also included a buffet, a restroom, a day room for patients, and a laboratory.

The floors in the patient rooms, like in other hospital buildings, were made of oak parquet, and the walls were painted with oil and glue paints. The height of the rooms in the pavilion reached 4.5 meters, while in the wards, it was 3.5 meters.

The red-brick single-story building with well-preserved white stone facade details fully corresponds to the style of most buildings in the Morozov Children's Hospital complex. The facade almost completely mirrors the facade of the adjacent Koryev Unit (building 12), but in a mirrored reflection.

The original appearance of the Infectious Disease Unit is preserved in a blueprint from the early 20th century from the archive of the Department of Cultural Heritage of Moscow. On the right side, the building had a second floor for medical staff, as well as two entrances: a main and an additional one. The main entrance featured a small rectangular vestibule. Above the additional entrance was an original element in the form of a white stone board that expanded upwards. On the left side of the building was the pavilion, the main treatment area of the unit, highlighted by an 'apsidal' risalit with large windows. The building stood on a low basement and was crowned with two slender chimneys.

Overall, the building of the Infectious Disease Unit has retained its historical appearance, including characteristic details such as the skylights on the roof of the main and side facades.