Map which Chapter 8 bases apply, then show the need is daily and can be met only in a SNF (the practical-matter test). This is what a coverage reviewer looks for on a Part A day.
Covered skilled procedure; observation & assessment
Complex perineal skin and wound care is a skilled service under Chapter 8, and the incontinent, immobile resident carries a reasonable potential for perineal breakdown and serious infection that requires daily nursing judgment to detect and manage.