ICD-10-CM 2027 diagnosis code
Q24.8Other specified congenital malformations of heart
Q24.8 is a valid, billable ICD-10-CM code for other specified congenital malformations of heart. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Ectocardia, ICD-10 code for Hemicardia, ICD-10 code for Heart agenesis, ICD-10 code for Cordis ectopia.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Q24.8
Q24.8 is the ICD-10-CM diagnosis code for other specified congenital malformations of heart. It belongs to category Q24 (other congenital malformations of heart), block Q20-Q28 (congenital malformations of the circulatory system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within Q24, choose Q24.8 (Other specified congenital malformations of heart) only when documentation doesn't support a more specific option: Dextrocardia (Q24.0), Levocardia (Q24.1), cor triatriatum (Q24.2), pulmonary infundibular stenosis (Q24.3), congenital subaortic stenosis (Q24.4), malformation of coronary vessels (Q24.5), congenital heart block (Q24.6) and congenital malformation of heart, unspecified (Q24.9).
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.
It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 746.84 (obstructive anomalies of heart, not elsewhere classified), 746.87 (malposition of heart and cardiac apex) and 746.89 (other specified congenital anomalies of heart).
Coding notes
- Congenital diverticulum of left ventricle
- Congenital malformation of myocardium
- Congenital malformation of pericardium
- Malposition of heart
- Uhl's disease
Notes that apply from higher levels
Instructions written at a parent level also apply to Q24.8.
› From Q24 Other congenital malformations of heart
- endocardial fibroelastosis (I42.4)
Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.
Alphabetic index entries
40 entriesTerms in the official ICD-10-CM index that lead to Q24.8.
- Absence (of) (organ or part) (complete or partial) › pericardium (congenital)
- Accessory (congenital) › cusp (s), heart valve NEC
- Accessory (congenital) › heart
- Accessory (congenital) › heart › valve NEC
- Accessory (congenital) › leaflet, heart valve NEC
- Accessory (congenital) › valve, heart NEC
- Agenesis › heart
- Agenesis › heart › valve NEC
- Agenesis › pericardium
- Anomaly, anomalous (congenital) (unspecified type) › band › heart
- Anomaly, anomalous (congenital) (unspecified type) › band › ventricular
- Anomaly, anomalous (congenital) (unspecified type) › cardiac › valve NEC
- Anomaly, anomalous (congenital) (unspecified type) › chordae tendineae
- Anomaly, anomalous (congenital) (unspecified type) › heart › bands or folds
- Anomaly, anomalous (congenital) (unspecified type) › heart › valve NEC
- Anomaly, anomalous (congenital) (unspecified type) › myocardium
- Anomaly, anomalous (congenital) (unspecified type) › papillary muscles
- Anomaly, anomalous (congenital) (unspecified type) › pericardium
- Anomaly, anomalous (congenital) (unspecified type) › Uhl's (hypoplasia of myocardium, right ventricle)
- Anomaly, anomalous (congenital) (unspecified type) › valve (heart) NEC
- Anomaly, anomalous (congenital) (unspecified type) › valve (heart) NEC › inferior vena cava
- Anomaly, anomalous (congenital) (unspecified type) › valve (heart) NEC › venae cavae inferioris
- Anomaly, anomalous (congenital) (unspecified type) › ventricular › bands or folds
- Atresia, atretic › heart valve NEC
- Band (s) › anomalous or congenital › heart (atrial) (ventricular)
- Bifid (congenital) › apex, heart
- Cardiomegaly › congenital
- Cardiomyopathy (familial) (idiopathic) › hypertrophic (nonobstructive) › obstructive › congenital
- Chiari's › net
- Cordis ectopia
- Cyst (colloid) (mucous) (simple) (retention) › celomic (pericardium)
- Cyst (colloid) (mucous) (simple) (retention) › pericardial (congenital)
- Deformity › heart (congenital) › valve (congenital) NEC
- Deformity › pericardium (congenital)
- Deformity › valve, valvular (congenital) (heart)
- Development › defective, congenital › left ventricle
- Development › defective, congenital › valve
- Dilatation › cardiac (acute) (chronic) › congenital
- Dilatation › cardiac (acute) (chronic) › congenital › valve NEC
- Dilatation › heart (acute) (chronic) › congenital
Codes whose notes reference Q24.8
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 05 · Diseases and Disorders of the Circulatory System
ICD-9-CM equivalent
Converter →- 746.84Obstructive anomalies of heart, not elsewhere classifiedapproximate
- 746.87Malposition of heart and cardiac apexapproximate
- 746.89Other specified congenital anomalies of heartapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Q24.8
Is Q24.8 billable?
- Yes. Q24.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q24.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q24.8 as a principal diagnosis.
Is Q24.8 a CC or MCC?
- No. Q24.8 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Q24.8 group to?
- Q24.8 is used in the MS-DRG v44.0 logic for MS-DRG 306 (Cardiac Congenital and Valvular Disorders with MCC) and MS-DRG 307 (Cardiac Congenital and Valvular Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for Q24.8?
- The CMS General Equivalence Mappings map Q24.8 to ICD-9-CM 746.84, 746.87 and 746.89.