Jaiswal, an IAS officer, spotted Aahana with a disfigured nose who was sitting among other kids at a programme organised by the Thane Municipal Corporation (TMC).
Aahana is a first standard student of the civic school number 54 at Manpada.
Jaiswal was disturbed seeing Aahana. He went to the girl and enquired about her disfigured nose, a TMC release said.
The Commissioner learnt that a rat had bit off the girl's nose while she was asleep in her house, leaving it disfigured.
Jaiswal also said that he will remain present at the time of the surgery, it added.