M91-M94 — Chondropathies
ICD-10-CM codes M91-M94 cover chondropathies, within diseases of the musculoskeletal system and connective tissue. The block holds 283 codes across 4 categories, of which 212 are billable and 71 are header codes that cannot be submitted on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- postprocedural chondropathies (M96.-)
What else to watch in M91-M94
- 114 codes are laterality-specific. They come in left and right pairs, and the pair is mutually exclusive on a single site: coding both without a bilateral code is a contradiction a scrubber should catch before the payer does.
- 212 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.