L62: Nail disorders in diseases classified elsewhere

Nail disorders in diseases classified elsewhere (L62) represent a group of conditions where changes in the nails are secondary to another underlying disease. These changes can range from discoloration, thickening, and ridging to crumbling or detachment of the nail from the nail bed, known as onycholysis. The original disease causing these nail changes can be of various origins such as systemic illnesses, infections, skin diseases, or even malignant conditions. As these disorders are due to underlying diseases, their symptomatology, progression, and impact on other systems are highly variable, reflecting the characteristics of the root condition. For instance, in psoriasis, a common skin disease, you may see pitting or small dents in the nails, while a chronic lung disease could lead to "clubbing" or a bulbous enlargement of nails. It's essential to remember that these nail changes are indicators pointing towards an underlying condition that requires diagnosis and management.