Big inconsistency in the confession. Why would Hank, the so-called “kingpin” need Walter to pay his medical bills?
Marie explained that in the same episode. Hank (the DEA guy) was injured in that fight with Hector Salamanca's twin nephews (the cartel hitmen with the skull-tipped boots and the shiny axe). Hank's medical insurance didn't cover the level of physical rehabilitation that he needed, so Marie accepted Walt's "gambling money" from Skylar. Hank didn't know about the money at all, much less its source - but his DEA superiors most likely won't buy that explanation.
yeah, that does not make sense but it would still leave Hank open to some questions
As hank said- its just a threat