2027 ICD-10-CM Diagnosis Code L13.9Bullous disorder, unspecified
ICD-10-CM Codes›L00–L99›L10-L14›L13
- Billable — Valid for Submission
- Chronic Condition
L13.9 is a billable ICD-10-CM diagnosis code for bullous disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 595 through 596. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified inflammatory condition of skin.
L13.9 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
L13.9 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.
- Bullous dermatosis
- Bullous eruption
- Bullous eruption of hand
- Bullous eruption of pharynx
- Bullous insect bite reaction
- Bullous wheal
- Insect bite reaction
- Intraepidermal bullous dermatosis
- Nail dystrophy associated with bullous dermatoses
- Neonatal bullous dermatosis caused by maternal antibodies
- Neonatal sucking blisters
- Wheal
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L13.9: 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.
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.
bullous L13.9
Disease, diseased See Also: Syndrome;
bullous L13.9
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 L13.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L13.9Overview
What is the ICD-10 code for bullous disorder, unspecified?
The ICD-10-CM code for bullous disorder, unspecified is L13.9 (sometimes written as L139). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L13.9 (Other bullous disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report bullous disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L13.9 group to?
When bullous disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 596, 595, with relative weights from 1.1067 to 2.0230 depending on complications. Higher weights mean higher Medicare reimbursement.
Can L13.9 be reported with Q82.8?
Not as a rule. The Excludes1 note at block L10-L14, which applies to L13.9, 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 L13.9?
Under the General Equivalence Mappings, bullous disorder, unspecified converts to ICD-9-CM 694.9 (bullous dermatoses NOS). The mapping is a direct match.
Does L13.9 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: L13.9 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).
