ICD-10-CM 2027
ICD-10 code for Acantholysis
From the official ICD-10-CM alphabetic index entry “Acantholysis”. Page updated September 29, 2026.
About coding Acantholysis
The ICD-10-CM code for Acantholysis is L11.9 (Acantholytic disorder, unspecified).
Within L11, choose L11.9 (Acantholytic disorder, unspecified) only when documentation doesn't support a more specific option: acquired keratosis follicularis (L11.0), transient acantholytic dermatosis [Grover] (L11.1) and other specified acantholytic disorders (L11.8).
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 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), 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.
Common questions about Acantholysis ICD-10 codes
What is the ICD-10 code for Acantholysis?
- L11.9 — Acantholytic disorder, unspecified.
Is L11.9 billable?
- Yes. L11.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L11.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L11.9 as a principal diagnosis.
Is L11.9 a CC or MCC?
- No. L11.9 is neither a CC nor an MCC under MS-DRG v44.0.