ICD-10-CM 2027
ICD-10 code for biloculare cor
From the official ICD-10-CM alphabetic index entry “Cor › biloculare”. Page updated September 29, 2026.
About coding biloculare cor
The ICD-10-CM code for biloculare cor is Q20.8 (Other congenital malformations of cardiac chambers and connections).
Within Q20, choose Q20.8 (Other congenital malformations of cardiac chambers and connections) only when documentation doesn't support a more specific option: common arterial trunk (Q20.0), Double outlet right ventricle (Q20.1), Double outlet left ventricle (Q20.2), Discordant ventriculoarterial connection (Q20.3), Double inlet ventricle (Q20.4), Discordant atrioventricular connection (Q20.5), Isomerism of atrial appendages (Q20.6) and congenital malformation of cardiac chambers and connections, unspecified (Q20.9).
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 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 biloculare cor ICD-10 codes
What is the ICD-10 code for biloculare cor?
- Q20.8 — Other congenital malformations of cardiac chambers and connections.
Is Q20.8 billable?
- Yes. Q20.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q20.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q20.8 as a principal diagnosis.
Is Q20.8 a CC or MCC?
- No. Q20.8 is neither a CC nor an MCC under MS-DRG v44.0.