ICD-10-CM 2027
ICD-10 code for bullous disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › bullous”. Page updated September 29, 2026.
About coding bullous disease
The ICD-10-CM code for bullous disease is L13.9 (Bullous disorder, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L13.9.
Within L13, choose L13.9 (Bullous disorder, unspecified) only when documentation doesn't support a more specific option: dermatitis herpetiformis (L13.0), Subcorneal pustular dermatitis (L13.1) and other specified bullous disorders (L13.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 595 (Major Skin Disorders with MCC, relative weight 2.0239) and DRG 596 (Major Skin Disorders without MCC, relative weight 1.1071), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific bullous disease codes (official index)
Common questions about bullous disease ICD-10 codes
What is the ICD-10 code for bullous disease?
- L13.9 — Bullous disorder, unspecified. More specific codes apply when the documentation supports them: L12.2, L13.8.
What is the ICD-10 code for chronic of childhood bullous disease?
- L12.2 — Chronic bullous disease of childhood.
Is L13.9 billable?
- Yes. L13.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L13.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L13.9 as a principal diagnosis.
Is L13.9 a CC or MCC?
- No. L13.9 is neither a CC nor an MCC under MS-DRG v44.0.