Q20.6 – Isomerism of atrial appendages

ICD-10-CM 2027 diagnosis code · Congenital malformations of the circulatory system

Billable code

ICD-10-CM code Q20.6

Code: Q20.6 (claims format: Q206)
Description: Isomerism of atrial appendages
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q20-Q28 Congenital malformations of the circulatory system
Parent codes: Q20

Notes for Q20.6

Applicable to:

Isomerism of atrial appendages with asplenia or polysplenia

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Q20 – Congenital malformations of cardiac chambers and connections

Excludes1 (not coded here):

dextrocardia with situs inversus (Q89.3)
mirror-image atrial arrangement with situs inversus (Q89.3)

Index terms for Q20.6

Entries in the ICD-10-CM alphabetic index that lead to this code:

Isomerism atrial appendages

Related codes in Q20

Q20.0 – Common arterial trunkBillable
Q20.1 – Double outlet right ventricleBillable
Q20.2 – Double outlet left ventricleBillable
Q20.3 – Discordant ventriculoarterial connectionBillable
Q20.4 – Double inlet ventricleBillable
Q20.5 – Discordant atrioventricular connectionBillable
Q20.8 – Other congenital malformations of cardiac chambers and connectionsBillable
Q20.9 – Congenital malformation of cardiac chambers and connections, unspecifiedBillable

Frequently asked questions

What is ICD-10 code Q20.6?

Q20.6 is the ICD-10-CM code for isomerism of atrial appendages, in the block Q20-Q28 (Congenital malformations of the circulatory system).

Is Q20.6 a billable code?

Yes. Q20.6 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q20.6 belong to?

It belongs to category Q20 – Congenital malformations of cardiac chambers and connections.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.