ICD-10 Code L98.5 – Mucinosis of the Skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L98.5 – Mucinosis of the skin
What it is
L98.5 identifies mucinosis of the skin, a condition where mucin accumulates in the skin tissue. Use this code when the documentation specifically names cutaneous mucinosis or a related mucin-deposition disorder.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include papules, plaques, nodules, or localized skin thickening, with diagnosis often supported by clinical assessment and, when noted, biopsy.
When to use this code
Use L98.5 when the provider documents mucinosis of the skin as the diagnosis, including localized or generalized cutaneous mucin deposition. Apply it when the record clearly distinguishes this condition from other dermal disorders. If the note only mentions a rash or nonspecific skin change, check documentation before coding.
Do not use for
Do not use this code for mucinosis involving organs other than skin, or for unrelated inflammatory or infectious skin conditions. If the documentation is vague or names a different dermatologic disorder, check documentation.
Coding tip
Code L98.5 only when the provider explicitly documents mucinosis of the skin; otherwise, query for the exact diagnosis.