FY2027 ICD-10-CM reference
Q20: Congenital malformations of cardiac chambers and connections
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Congenital malformations of cardiac chambers and connections. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- Q20.0: Common arterial trunkBillable code
- Q20.1: Double outlet right ventricleBillable code
- Q20.2: Double outlet left ventricleBillable code
- Q20.3: Discordant ventriculoarterial connectionBillable code
- Q20.4: Double inlet ventricleBillable code
- Q20.5: Discordant atrioventricular connectionBillable code
- Q20.6: Isomerism of atrial appendagesBillable code
- Q20.8: Other congenital malformations of cardiac chambers and connectionsBillable code
- Q20.9: Congenital malformation of cardiac chambers and connections, unspecifiedBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Codes from this chapter are not for use on maternal records
Source: Q00-QA1 (chapter, inherited).
Excludes2
inborn errors of metabolism (E70-E88)
Source: Q00-QA1 (chapter, inherited).
Excludes1
dextrocardia with situs inversus (Q89.3)
Source: Q20 (category, direct).
Excludes1
mirror-image atrial arrangement with situs inversus (Q89.3)
Source: Q20 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does Q20 mean in FY2027?
The official ICD-10-CM descriptor is Congenital malformations of cardiac chambers and connections. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is Q20 billable in FY2027?
The FY2027 order file marks Q20 as a nonbillable heading. Select a complete billable child code.
Does Q20 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition