There are separate charge codes for everything , and all of those codes need to be reflected in the pricing data. There's a price to slap on a bandaid. There's a price to give someone a Tylenol. Hell, W61.61XA is the medical code for "Bitten by duck, initial encounter." Presumably, this means there's also a code for "Bitten by duck, again." Medical billing is broken , and it's no surprise that the amount of data is o…
Here's the full list of codes for "Bitten by ____, _____ encounter" https://www.icd10data.com/ICD10CM/Codes/V00-Y99/W50-W64/W61- The hierarchy looks like this: W61.6 Contact with duck = W61.61 Bitten by duck == W61.61XA …… initial encounter == W61.61XD …… subsequent encounter == W61.61XS …… sequela = W61.62 Struck by duck == W61.62XA …… initial encounter == W61.62XD …… subsequent encounter == W61.62XS …… sequela = W6…
ICD codes also are somewhat procedural in their generation - that is, there's a whole grammar to how they're formed. For example, you'll have something like "contact with", then a whole number of different animals, and then each of those will have three different varieties (initial encounter, subsequent encounter, sequela). So it does end up with very funny lists, like the one you posted, but:
(a) most of those codes are never used, and
(b) just because it's assigned just means that it's a "grammatically valid" combination, not that it has any particular clinical relevance.
The goal is to assign granular and hierarchical codes at the outset, to allow for more robust analysis later, at least in theory.
But again, all of that is irrelevant to billing, because while ICD codes are typically submitted along with the billing info (along with a whole other slew of data), ICD codes are not the actual code that's billed - there's a whole separate list of codes used for billing.