Nash is most likely experiencing the Delusional disorder if he believes that he is a part of a secret spy organization that sends coded messages to its informants through television commercials.
Delusional disorder, recently called neurotic confusion, is a sort of genuine psychological sickness - called a "psychosis"- in which an individual can't determine what is genuine based on what is envisioned.
Delusional disorder, previously called paranoid disorder, is a type of serious mental illness called a “psychosis” in which a person cannot tell what is real from what is imagined. The main feature of this disorder is the presence of delusions, which are unshakable beliefs in something untrue.
Learn more about Delusional disorder here,
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