2027 ICD-10-CM Diagnosis Code L91.9Hypertrophic disorder of the skin, unspecified
ICD-10-CM Codes›L00–L99›L80-L99›L91
- Billable — Valid for Submission
- Not Chronic
L91.9 is a billable ICD-10-CM diagnosis code for hypertrophic disorder of the skin, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. Coders also document this condition as hypertrophic condition of skin. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hypertrophic condition of skin
- Hypertrophy of skin of sole of foot
- Skin graft hypertrophy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L91.9: 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.
- 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 L91.9, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
hypertrophic L91.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert L91.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L91.9Overview
What is the ICD-10 code for hypertrophic disorder of the skin, unspecified?
The ICD-10-CM code for hypertrophic disorder of the skin, unspecified is L91.9 (sometimes written as L919). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L91.9 (Hypertrophic disorders of skin) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hypertrophic disorder of the skin, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L91.9 group to?
When hypertrophic disorder of the skin, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of L91.9?
Under the General Equivalence Mappings, hypertrophic disorder of the skin, unspecified converts to ICD-9-CM 701.9 (skin hypertro/atroph NOS). The mapping is approximate, so confirm the match fits the documentation.
