ICD-10-CM Code Q21.1
Atrial septal defect
Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.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.Q21.1 is a billable ICD code used to specify a diagnosis of atrial 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:
| Indicator | Meaning | CMS Will Pay CC/MCC DRG Costs |
|---|---|---|
| Y | Diagnosis was present at time of inpatient admission | Yes |
| N | Diagnosis was not present at time of inpatient admission | No |
| U | Documentation insufficient to determine if the condition was present at the time of inpatient admission. | No |
| W | Clinically undetermined. Provider unable to clinically determine whether the condition was present at the time of inpatient admission. | Yes |
| 1 | Exempt from POA reporting | No |
The ICD code Q211 is used to code Atrial septal defect
Atrial septal defect (ASD) is a congenital heart defect in which blood flows between the atria (upper chambers) of the heart. Normally, the atria are separated by a dividing wall, the interatrial septum. If this septum is defective or absent, then oxygen-rich blood can flow directly from the left side of the heart to mix with the oxygen-poor blood in the right side of the heart, or vice versa. This can lead to lower-than-normal oxygen levels in the arterial blood that supplies the brain, organs, and tissues. However, an ASD may not produce noticeable signs or symptoms, especially if the defect is small.
| Specialty: | Cardiac Surgery |
| MeSH Codes: | , |
| ICD 9 Codes: | 745.5, 745.6 |
Illustration of an atrial septal defect.
Coding Notes for Q21.1 Info for medical coders on how to properly use this ICD-10 code
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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. - Coronary sinus defect
- Patent or persistent foramen ovale
- Patent or persistent ostium secundum defect (type II)
- Patent or persistent sinus venosus defect
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.
ICD-10-CM Alphabetical Index References for 'Q21.1 - Atrial septal defect'
The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code Q21.1. Click on any term below to browse the alphabetical index.
Equivalent ICD-9 Code GENERAL EQUIVALENCE MAPPINGS (GEM)
This is the official exact match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that in all cases where the ICD9 code 745.5 was previously used, Q21.1 is the appropriate modern ICD10 code.
Parent Code: Q21 - Congenital malformations of cardiac septa