ICD-10-CM lookup with the instructional notes that govern each code, the index entries that lead to it, and CMS-HCC risk scoring that shows its working.
A rule at the category or chapter level is shown against the level that owns it, not merged into the code. If you have to defend a claim, you can cite where the instruction comes from.
Every path through the alphabetic index that arrives at a code, including the ones written as rules rather than codes — so you can see what the documentation would have to say.
Code sets change every 1 October. The effective date travels in the URL, so a link you send reproduces exactly what you saw.
Risk scoring reports which codes mapped where, what was suppressed, and what each factor contributed — never a bare number.
