Where to start the Monster manga after the anime

Give it the last episode you watched. The mappings cover whole seasons. At a season boundary, the answer gives the next unread chapter; within a season, it gives a conservative starting point that may repeat material.

Every span the anime adapts

One row per season or film: the episodes, the chapters they adapt, and a note on where the boundary falls.

AnimeEpisodesChaptersNote
Monster Full series1–741–162Adapts the whole manga. ANN's reviewer says it is his understanding that the anime is a shot-for-shot adaptation, and the titles bracket it: episode 1 and chapter 1 are both 'Herr Dr. Tenma', and episode 74 and chapter 162, the last, are both 'The Real Monster'. Chapter numbers follow the original 18-volume edition.