Other overlap syndromes

This code represents a group of autoimmune connective tissue diseases where patients exhibit features of two or more distinct, well-defined connective tissue diseases, but do not meet the full diagnostic criteria for any single one. These syndromes involve a combination of symptoms from conditions such as systemic lupus erythematosus, scleroderma, polymyositis, or rheumatoid arthritis.

This code is appropriate when documentation clearly indicates a patient presents with overlapping features of multiple connective tissue diseases that do not fit the criteria for a specific, singular diagnosis. It is used when the physician explicitly diagnoses "overlap syndrome" or describes a combination of symptoms from various autoimmune conditions without a definitive primary diagnosis.

• Ensure the physician's documentation explicitly states "overlap syndrome" or describes a combination of features from multiple connective tissue diseases.
• Do not use this code if the documentation specifies polyangiitis overlap syndrome, as this is an Excludes1 note.
• Review the medical record for specific manifestations to code them additionally, if applicable and supported by documentation.