Q20.9
Congenital malformation of cardiac chambers and connections, unspecified
Q20.9 (also written Q209) is a billable ICD-10-CM diagnosis code for congenital malformation of cardiac chambers and connections, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 9 codes in category Q20 (Congenital malformations of cardiac chambers and connections). The Alphabetic Index lists it under 2 entries. Its coding notes include 2 Excludes1 entries and 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries