2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Hypertrophic disorders of skin
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to L91: its own notes plus those printed at Chapter 12. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 12 (L00-L99) Diseases of the skin and subcutaneous tissue applies to 1,001 codes
  • 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 tissue disorders (M30-M36)
  • viral warts (B07.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name L91, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming L91: its condition is not part of those codes, and both may be reported when the patient has both.

  • L85 Other epidermal thickening
    hypertrophic disorders of the skin (L91.-)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About L91Overview

What is the ICD-10 code for hypertrophic disorders of skin?

L91 is the ICD-10-CM category for hypertrophic disorders of skin, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.