Other Niemann-Pick disease

This code identifies a rare, inherited metabolic disorder characterized by the abnormal accumulation of lipids (fats) within cells, specifically sphingomyelin and cholesterol. It encompasses various forms of Niemann-Pick disease that do not fit the specific criteria for types A, B, C1, or C2. These disorders can affect multiple organ systems, including the brain, liver, spleen, and lungs.

Use this code when documentation specifies a diagnosis of Niemann-Pick disease that is not type A, B, C1, or C2. This typically applies to atypical presentations or newly identified variants of the disease. Supporting documentation should clearly state "other Niemann-Pick disease" or provide specific genetic or biochemical findings that differentiate it from the more common types.

• Ensure documentation explicitly rules out Niemann-Pick types A, B, C1, and C2 before assigning this code.
• Review genetic testing results or detailed biochemical analyses for precise Niemann-Pick subtyping.
• Code any associated neurological, hepatic, or other systemic manifestations separately as secondary diagnoses.