According to Curtis, an episode of Hulu’s original series 11.22.63 features a reference to M*A*S*H. Based on a novel by Stephen King, 11.22.63 stars James Franco as Jake Epping–a man who goes back in time to 1960 and tries to stop President Kennedy from being assassinated:
In the second episode (“The Kill Floor,” released February 22nd, 2016) time traveler Jake Epping is in a conversation with a veteran in 1960. He is asked “Did you serve?” and Jake replies “Yes. I was in the Medical Corps, M*A*S*H 4077.”
I’ve added this to my M*A*S*H References on Television page.