2021 ICD-10-CM Diagnosis Code Q23.9

Congenital malformation of aortic and mitral valves, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
  • Q23.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Congenital malformation of aortic and mitral valves, unsp
  • The 2021 edition of ICD-10-CM Q23.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of Q23.9 - other international versions of ICD-10 Q23.9 may differ.
The following code(s) above Q23.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to Q23.9:
  • Q00-Q99
    2021 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • Codes from this chapter are not for use on maternal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Q23.9 is considered exempt from POA reporting.
ICD-10-CM Q23.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 306 Cardiac congenital and valvular disorders with mcc
  • 307 Cardiac congenital and valvular disorders without mcc

Convert Q23.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
Code annotations containing back-references to Q23.9:
  • Type 1 Excludes: I34
    ICD-10-CM Diagnosis Code I34

    Nonrheumatic mitral valve disorders

      2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • mitral valve disease (I05.9)
    • mitral valve failure (I05.8)
    • mitral valve stenosis (I05.0)
    • mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valve(s) (I08.-)
    • mitral valve disorder of unspecified cause with mitral stenosis or obstruction (I05.0)
    • mitral valve disorder specified as congenital (Q23.2, Q23.9)
    • mitral valve disorder specified as rheumatic (I05.-)

Diagnosis Index entries containing back-references to Q23.9:
  • Anomaly, anomalous (congenital) (unspecified type) Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • mitral (leaflets) (valve) Q23.9
    • aortic cusp or valve Q23.9
  • Malformation (congenital) - see also Anomaly

ICD-10-CM Codes Adjacent To Q23.9
Q22.6 Hypoplastic right heart syndrome
Q22.8 Other congenital malformations of tricuspid valve
Q22.9 Congenital malformation of tricuspid valve, unspecified
Q23 Congenital malformations of aortic and mitral valves
Q23.0 Congenital stenosis of aortic valve
Q23.1 Congenital insufficiency of aortic valve
Q23.2 Congenital mitral stenosis
Q23.3 Congenital mitral insufficiency
Q23.4 Hypoplastic left heart syndrome
Q23.8 Other congenital malformations of aortic and mitral valves
Q23.9 Congenital malformation of aortic and mitral valves, unspecified
Q24 Other congenital malformations of heart
Q24.0 Dextrocardia
Q24.1 Levocardia
Q24.2 Cor triatriatum
Q24.3 Pulmonary infundibular stenosis
Q24.4 Congenital subaortic stenosis
Q24.5 Malformation of coronary vessels
Q24.6 Congenital heart block
Q24.8 Other specified congenital malformations of heart
Q24.9 Congenital malformation of heart, unspecified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.