ICD-10-CM 2027
ICD-10 code for aortic arch interruption
From the official ICD-10-CM alphabetic index entry “Interruption › aortic arch”. Page updated September 29, 2026.
About coding aortic arch interruption
The ICD-10-CM code for aortic arch interruption is Q25.21 (Interruption of aortic arch).
Within Q25.2 (atresia of aorta), Q25.21 is specifically for Interruption of aortic arch. Related codes cover other atresia of aorta (Q25.29).
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 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), in MDC 05 (Diseases and Disorders of the Circulatory System), 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 aortic arch interruption ICD-10 codes
What is the ICD-10 code for aortic arch interruption?
- Q25.21 — Interruption of aortic arch.
Is Q25.21 billable?
- Yes. Q25.21 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q25.21 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q25.21 as a principal diagnosis.
Is Q25.21 a CC or MCC?
- Q25.21 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.