Other specified crystal arthropathies, multiple sites

This code signifies the presence of joint inflammation caused by the deposition of various crystal types (excluding gout, pseudogout, and other specifically classified crystal arthropathies) affecting multiple joints throughout the body. It indicates a systemic or widespread involvement of these less common crystal-induced arthropathies.

Use this code when documentation specifies a crystal arthropathy that is not gout, calcium pyrophosphate deposition disease (CPPD), or another explicitly defined crystal arthropathy, and the condition affects more than one joint site. This code is appropriate when the specific type of crystal is identified but doesn't have a more precise ICD-10-CM code, or when the crystal type is unknown but confirmed to be a crystal arthropathy and involves multiple sites.

• Ensure documentation clearly states "multiple sites" or lists several affected joints to support the "multiple sites" specificity.
• Distinguish carefully from gout (M10.-) and calcium pyrophosphate deposition (M11.1-) which have their own specific codes.
• If only one joint is affected by an "other specified crystal arthropathy," use M11.8- with a fifth character indicating the specific site.