Hypertrophic disorders of skin (L91) ICD-10-CM
The L91 code range covers hypertrophic disorders of skin with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the L91 Range 4 codes · 3 billable
About the L91 Code Range
The ICD-10 code L91 covers hypertrophic disorders of the skin, which are conditions characterized by excessive thickening or overgrowth of skin tissue. This group of codes is used to classify and document different types of abnormal skin thickening, including scars and other related skin growths.
The ICD-10 code L91.0 specifically refers to hypertrophic scars, including those commonly called keloid scars, acne scars, or hypertrophic acne scars. These involve raised, thickened scars that may occur after surgery, acne, or skin injuries. Codes like L91.8 describe other hypertrophic skin disorders such as skin tags or fibroepithelial polyps, benign overgrowths typically found on the neck or eyelids. For cases where the hypertrophic skin disorder is not clearly specified, L91.9 applies, capturing conditions like skin graft hypertrophy or general skin thickening without detailed diagnosis. Using these ICD-10 codes helps medical coders accurately identify and document various thickening skin conditions, supporting clear communication in healthcare records and billing for treatments related to hypertrophic skin disorders.
Questions About This Page
How many billable codes are in the L91 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the L91 range classify?
The range classifies hypertrophic disorders of skin. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
