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ICD-10-CM Code Q21.4
Aortopulmonary septal defect

BILLABLE
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
POA Exempt
POA Exempt Code
The Center for Medicare & Medicaid Services (CMS) requires medical coders to indicate whether or not a condition was present at the time of admission, in order to properly assign MS-DRG codes. This "Present On Admission" (POA) indicator is recorded on CMS form 4010A.
| ICD-10 from 2011 - 2016

Q21.4 is a billable ICD code used to specify a diagnosis of aortopulmonary septal defect. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

POA Indicators on CMS form 4010A are as follows:

IndicatorMeaningCMS Will Pay CC/MCC DRG Costs
YDiagnosis was present at time of inpatient admissionYes
NDiagnosis was not present at time of inpatient admissionNo
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.No
WClinically undetermined. Provider unable to clinically determine whether the condition was present at the time of inpatient admission.Yes
1Exempt from POA reportingNo


The ICD code Q214 is used to code Aortopulmonary window

The aortopulmonary window is a small space between the aortic arch and the pulmonary artery that is visible in the lateral chest radiograph. It contains the ligamentum arteriosum, the recurrent laryngeal nerve, lymph nodes, and fatty tissue. The space is bounded anteriorly by the ascending aorta, posteriorly by the descending aorta, medially by the left main bronchus, and laterally by mediastinal pleura.

Specialty: Medical Genetics
MeSH Codes: , D001028, D001028
ICD 9 Codes: 745.0, 745.0, 745.1
Source: Wikipedia

Coding Notes for Q21.4 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Aortic septal defect
Aortopulmonary window

MS-DRG Mapping

  • DRG Group #306-307 - Cardiac congenital and valvular disorders with MCC.
  • DRG Group #306-307 - Cardiac congenital and valvular disorders without MCC.

Related Concepts SNOMET-CT

  • Aortopulmonary window (disorder)

ICD-10-CM Alphabetical Index References for 'Q21.4 - Aortopulmonary septal defect'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code Q21.4. Click on any term below to browse the alphabetical index.

Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)

Other bulbus cordis anomalies and anomalies of cardiac septal closure (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code Q21.4 and a single ICD9 code, 745.8 is an approximate match for comparison and conversion purposes.


Parent Code: Q21 - Congenital malformations of cardiac septa

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/Q214