2027 ICD-10-CM Diagnosis Code L13.1Subcorneal pustular dermatitis
ICD-10-CM Codes›L00–L99›L10-L14›L13
- Billable — Valid for Submission
- Chronic Condition
L13.1 is a billable ICD-10-CM diagnosis code for subcorneal pustular dermatitis. 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 monoclonal gammopathy of uncertain significance. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.
L13.1 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 314 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
L13.1 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Monoclonal gammopathy of uncertain significance
- Subcorneal pustular dermatosis
- Subcorneal pustular dermatosis with paraproteinemia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L13.1: its own notes plus those printed at block L10-L14 and Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Sneddon-Wilkinson disease
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Syndrome See Also: Disease;
Sneddon-Wilkinson L13.1
Wilkinson-Sneddon L13.1
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 L13.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L13.1Overview
What is the ICD-10 code for subcorneal pustular dermatitis?
The ICD-10-CM code for subcorneal pustular dermatitis is L13.1 (sometimes written as L131). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L13.1 (Other bullous disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report subcorneal pustular dermatitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L13.1 group to?
When subcorneal pustular dermatitis 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.
Can L13.1 be reported with Q82.8?
Not as a rule. The Excludes1 note at block L10-L14, which applies to L13.1, lists "benign familial pemphigus [Hailey-Hailey] (Q82.8)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of L13.1?
Under the General Equivalence Mappings, subcorneal pustular dermatitis converts to ICD-9-CM 694.1 (subcorneal pust dermatos). The mapping is a direct match.
Does L13.1 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: L13.1 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 314 (Pemphigus, Pemphigoid, and Other Bullous Skin Disorders).
