2026 ICD-10-CM Diagnosis Code L91Hypertrophic disorders of skin

ICD-10-CM Codes›L00–L99›L80-L99›L91

ICD-10-CM L91
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L91 is a non-billable ICD-10-CM category code for hypertrophic disorders of skin, so it cannot be submitted on claims. Use a more specific code from this category instead, such as L91.0, L91.8, and L91.9.

Code Identity

ICD-10-CM Code
L91
Billable Status
No — Non-Billable Category
Code Describes
Hypertrophic disorders of skin
Chapter
L80-L99
Other disorders of the skin and subcutaneous tissue

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL80-L99Other disorders of the skin and subcutaneous tissue
CategoryL91Hypertrophic disorders of skin
This CodeL91Hypertrophic disorders of skin

Specific Coding for Hypertrophic disorders of skinOverview

Non-specific codes like L91 require more characters. Use one of these billable codes instead:

  • Use L91.0 for Hypertrophic scar

  • Use L91.8 for Other hypertrophic disorders of the skin

  • Use L91.9 for Hypertrophic disorder of the skin, unspecified

Patient EducationClinical

Skin Conditions

Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:

The full article covers:

  • What does your skin do?
  • What problems and conditions can affect your skin?
  • How can I keep my skin healthy?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L91Overview

Is L91 (Hypertrophic disorders of skin) a billable code?

No. This is a category header that groups the codes for hypertrophic disorders of skin, and headers cannot be submitted on claims. Claims for hypertrophic disorders of skin need a more specific code from this category, such as L91.0, L91.8, and L91.9.