L91Header code — not billable

Hypertrophic disorders of skin

Chapter
12. Diseases of the skin and subcutaneous tissue
Category
L91
Effective date
October 1, 2026

Related codes in category L91

L91.0Hypertrophic scarYesL91.8Other hypertrophic disorders of the skinYesL91.9Hypertrophic disorder of the skin, unspecifiedYes

Frequently asked questions

What is ICD-10 code L91?

L91 is an ICD-10-CM diagnosis code for Hypertrophic disorders of skin.

Is L91 a billable code?

No. L91 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is L91 in?

L91 falls under Chapter 12: Diseases of the skin and subcutaneous tissue.

When did L91 become effective?

L91 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to L91?

L91 belongs to category L91, which includes 3 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.