Other specified crystal arthropathies, vertebrae

This code signifies an inflammatory joint condition affecting the vertebral column, caused by the deposition of crystals other than those seen in gout (monosodium urate) or pseudogout (calcium pyrophosphate dihydrate). It encompasses rare crystal-induced arthropathies impacting the spine, such as calcium oxalate or cholesterol crystal deposition.

Apply this code when documentation specifies a crystal arthropathy of the vertebrae, and the crystal type is identified but is not uric acid or calcium pyrophosphate. This diagnosis typically requires advanced imaging (e.g., CT, MRI) and/or synovial fluid analysis confirming the presence of atypical crystals in a vertebral joint.

• Ensure the documentation explicitly states "other specified" or identifies a specific non-gout/non-pseudogout crystal type affecting the vertebrae.
• Do not use this code for unspecified crystal arthropathies; instead, refer to M11.9.
• Sequence this code as a primary diagnosis when the crystal arthropathy is the reason for the encounter, or as a secondary diagnosis if it's a co-morbidity.