The hospital has ordered an inquiry into the incident.
According to the autopsy report, the deceased, Dattatray Kamble, had high blood pressure due to which a blood vessel ruptured causing his death, a senior official of Boiwada police station said.
He said doctors described it as a natural death and hence, no case has been registered.
Kamble, a resident of Kolhapur, had come to Mumbai for the treatment of his wife, Sunanda, who suffers from a kidney problem.
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After that his family could not locate him and searched for him everywhere. Kamble's body was found by the hospital staff yesterday morning in the toilet.
KEM Hospital Dean Avinash Supe said as per preliminary investigation, a female nurse locked the bathroom after the OPD was closed at 4 PM on Tuesday.
Since the toilet was for men, she did not enter it. The nurse called out a couple of times and locked the door when there was no response, Supe said.