Diseases of the skin and subcutaneous tissue (L00–L99) ICD-10-CM
Chapter 12 of the ICD-10-CM classification spans codes L00–L99 and contains 1,206 diagnosis codes for diseases of the skin and subcutaneous tissue, of which 1,000 are billable. The chapter is organized into 9 sections listed below, each linking to its code ranges and individual codes.
Chapter Coding Notes
Excludes2: certain conditions originating in the perinatal period (P04-P96), certain infectious and parasitic diseases (A00-B99), complications of pregnancy, childbirth and the puerperium (O00-O9A), congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99), endocrine, nutritional and metabolic diseases (E00-E88), lipomelanotic reticulosis (I89.8), neoplasms (C00-D49), symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)systemic connective
Sections in This Chapter 9 ranges · 1,206 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 12
ICD-10-CM Chapter 12 (L00–L99) covers a wide range of skin and subcutaneous tissue diseases, including infections, inflammatory conditions, and other disorders affecting the skin's outer and deeper layers.
This chapter includes codes for common conditions such as bacterial infections like cellulitis, fungal infections, viral skin diseases, and inflammatory disorders including dermatitis and eczema. It also encompasses codes for more specific problems like bullous disorders, pigmentation changes, and disorders of sweat glands and hair follicles. These codes help healthcare professionals describe and document the various kinds of skin diseases encountered in clinical practice, providing a structured way to indicate the nature, severity, and sometimes the cause of the skin condition. This classification supports accurate diagnosis, treatment planning, and health records management for skin-related illnesses in both outpatient and inpatient settings. Understanding these codes benefits patients and providers by ensuring precise communication about skin health issues and related treatments.
Questions About This Page
How many codes are in the L00-L99 range?
The L00-L99 range contains 1,206 ICD-10-CM diagnosis codes in FY 2026. 1,000 of them are billable, and the rest are category headers that organize the chapter.
What conditions does L00-L99 cover?
The range covers diseases of the skin and subcutaneous tissue. The sections listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
