ICD-10-CM 2027
ICD-10 code for malignant carbuncle
From the official ICD-10-CM alphabetic index entry “Carbuncle › malignant”. Page updated September 29, 2026.
About coding malignant carbuncle
The ICD-10-CM code for malignant carbuncle is A22.0 (Cutaneous anthrax).
Within A22 (anthrax), A22.0 is specifically for cutaneous anthrax. Related codes cover pulmonary anthrax (A22.1), gastrointestinal anthrax (A22.2), sepsis (A22.7), other forms of anthrax (A22.8) and unspecified (A22.9).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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 malignant carbuncle ICD-10 codes
What is the ICD-10 code for malignant carbuncle?
- A22.0 — Cutaneous anthrax.
Is A22.0 billable?
- Yes. A22.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A22.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A22.0 as a principal diagnosis.
Is A22.0 a CC or MCC?
- A22.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.