Several years ago, CMS announced a process where it would codify something it was already doing - making benefit category decisions for new HCPCS code applications. That is, CMS already for years would deny a new HCPCS applicant on the grounds it was "not a benefit category" - "Thanks, CMS." And if it gave you a code, it usually meant, they believed it did fit some benefit category.
Such decisions are now organized in one place, and regularly updated.
Hint: you might find the denials more interesting that the acceptances. Only problem is, most of the denials for "no benefit category" never get a code, either, so they never survive long enogh to make it onto this list.
For an exception, see "artificial saliva" A9154, p 8, which has no benefit category (although it did get a code!, which probably took a lot of pushing and repeat visits with CMS.)
Breast milk bags are "contractor discretion" with a manual pump but no benefit category with an electric pump. (Head-spinning.)
See transmittal here:
https://www.cms.gov/files/document/r13889bp.pdf