ICD-10 Diagnosis Code Q21.2

Atrioventricular septal defect

Diagnosis Code Q21.2

ICD-10: Q21.2
Short Description: Atrioventricular septal defect
Long Description: Atrioventricular septal defect
This is the 2019 version of the ICD-10-CM diagnosis code Q21.2

Valid for Submission
The code Q21.2 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • Congenital malformations of the circulatory system (Q20-Q28)
      • Congenital malformations of cardiac septa (Q21)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code Q21.2 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)

  • 306 - CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC
  • 307 - CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC

Convert to ICD-9
  • 745.60 - Endocard cushion def NOS (Approximate Flag)
  • 745.61 - Ostium primum defect (Approximate Flag)
  • 745.69 - Endocard cushion def NEC (Approximate Flag)

Present on Admission (POA)
The code Q21.2 is exempt from POA reporting.

Synonyms
  • Abnormality of atrioventricular valve leaflet in atrioventricular septal defect
  • Abnormality of common atrioventricular valve chordae tendinae
  • Abnormality of common atrioventricular valve chordae tendinae
  • Abnormality of common atrioventricular valve chordae tendinae
  • Abnormality of common atrioventricular valve chordae tendinae
  • Abnormality of common atrioventricular valve in atrioventricular septal defect
  • Abnormality of common atrioventricular valve papillary muscle
  • Abnormality of common atrioventricular valve papillary muscle
  • Abnormality of common atrioventricular valve papillary muscle
  • Accessory tissue on common atrioventricular valve leaflet
  • Acquired abnormality of atrioventricular valve associated with atrioventricular septal defect
  • Acquired cardiovascular abnormality associated with atrioventricular septal defect
  • Arcade abnormality of common atrioventricular valve chordae
  • Atresia of common atrioventricular valve
  • Atrial septal defect with endocardial cushion defect, partial type
  • Atrioventricular septal defect - isolated atrial component
  • Atrioventricular septal defect - isolated ventricular component
  • Atrioventricular septal defect - ventricular component
  • Atrioventricular septal defect - ventricular component under inferior bridging leaflet
  • Atrioventricular septal defect - ventricular component under superior bridging leaflet
  • Atrioventricular septal defect and common atrioventricular junction
  • Atrioventricular septal defect associated with tetralogy of Fallot
  • Atrioventricular septal defect with additional muscular ventricular septal defect
  • Atrioventricular septal defect with atrial and ventricular components and separate atrioventricular valves
  • Atrioventricular septal defect with atrioventricular valve regurgitation
  • Atrioventricular septal defect with atrioventricular valve regurgitation through left inferior bridging leaflet lateral mural commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through left septal commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through left superior bridging leaflet lateral mural commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through right anterosuperior inferior mural commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through right anterosuperior superior bridging leaflet commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through right inferior bridging leaflet inferior mural commissure
  • Atrioventricular septal defect with atrioventricular valve regurgitation through right septal commissure
  • Atrioventricular septal defect with common atrioventricular orifice
  • Atrioventricular septal defect with restrictive ventricular component
  • Atrioventricular septal defect with separate atrioventricular orifices
  • Atrioventricular septal defect with ventricular component and interchordal shunting under inferior bridging leaflet
  • Atrioventricular septal defect with ventricular component and interchordal shunting under superior bridging leaflet
  • Atrioventricular septal defect with ventricular component and shunting under connecting tongue with separate orifices
  • Atrioventricular septal defect with ventricular component under free floating superior bridging leaflet and chords to papillary muscle at right ventricular free wall
  • Atrioventricular septal defect with ventricular component under inferior bridging leaflet with chords to crest ventricular septum
  • Atrioventricular septal defect with ventricular component under superior bridging leaflet with chords at crest ventricular septum
  • Atrioventricular septal defect with ventricular component under superior bridging leaflet with chords to papillary muscle on right ventricular side septum
  • Atrioventricular septal defect with ventricular component under superior bridging leaflet without chordal attachment to ventricular septal crest
  • Atrioventricular septal defect with ventricular imbalance consisting of dominant left ventricle and hypoplastic right ventricle
  • Atrioventricular septal defect with ventricular imbalance consisting of dominant right ventricle and hypoplastic left ventricle
  • Atrioventricular septal defect: atrial and ventricular components
  • Common atrioventricular canal
  • Common atrioventricular junction
  • Common atrioventricular orifice in double inlet ventricle
  • Common atrioventricular valve chordae to outlet septum
  • Common atrioventricular valve chordae too long
  • Common atrioventricular valve chordae too short
  • Common atrioventricular valve prolapse
  • Common atrioventricular valve stenosis
  • Common atrioventricular-type ventricular septal defect
  • Common atrium
  • Congenital abnormality of atrioventricular valve leaflet in atrioventricular septal defect
  • Congenital abnormality of atrioventricular valve papillary muscle in atrioventricular septal defect
  • Congenital abnormality of atrioventricular valves in atrioventricular septal defect
  • Congenital abnormality of atrioventricular valves in atrioventricular septal defect
  • Congenital abnormality of atrioventricular valves in atrioventricular septal defect
  • Deficiency of atrioventricular valve leaflet in atrioventricular septal defect
  • Double orifice of common atrioventricular valve
  • Endocardial cushion defect
  • Fenestration of atrioventricular valve leaflet in atrioventricular septal defect
  • Flail atrioventricular valve leaflet in atrioventricular septal defect
  • Fused common atrioventricular valve papillary muscle
  • Gelatinous atrioventricular valve leaflet in atrioventricular septal defect
  • Hypoplasia of common atrioventricular valve
  • Hypoplastic common atrioventricular valve papillary muscle
  • Imperforate common atrioventricular valve
  • Mass associated with atrioventricular valve leaflet in atrioventricular septal defect
  • Noncoapting atrioventricular valve leaflet in atrioventricular septal defect
  • Parachute malformation of common atrioventricular valve
  • Partial defect of atrioventricular canal
  • Regurgitation of atrioventricular valve
  • Regurgitation of common atrioventricular valve
  • Spontaneous closure of atrial component of atrioventricular septal defect
  • Spontaneous closure of ventricular component of atrioventricular septal defect
  • Spontaneous closure of ventricular septal defect
  • Spontaneous closure of ventricular septal defect due to accessory tissue of atrioventricular valve
  • Thickened atrioventricular valve leaflet in atrioventricular septal defect
  • Triple orifice of left ventricular component of common atrioventricular valve
  • True cleft of common atrioventricular valve leaflet

Index of Diseases and Injuries
References found for the code Q21.2 in the Index of Diseases and Injuries:

  • Inclusion Terms:
    • Common atrioventricular canal
    • Endocardial cushion defect
    • Ostium primum atrial septal defect (type I)

Information for Patients


Congenital Heart Defects

A congenital heart defect is a problem with the structure of the heart. It is present at birth. Congenital heart defects are the most common type of birth defect. The defects can involve the walls of the heart, the valves of the heart, and the arteries and veins near the heart. They can disrupt the normal flow of blood through the heart. The blood flow can slow down, go in the wrong direction or to the wrong place, or be blocked completely.

Doctors use a physical exam and special heart tests to diagnose congenital heart defects. They often find severe defects during pregnancy or soon after birth. Signs and symptoms of severe defects in newborns include

  • Rapid breathing
  • Cyanosis - a bluish tint to the skin, lips, and fingernails
  • Fatigue
  • Poor blood circulation

Many congenital heart defects cause few or no signs and symptoms. They are often not diagnosed until children are older.

Many children with congenital heart defects don't need treatment, but others do. Treatment can include medicines, catheter procedures, surgery, and heart transplants. The treatment depends on the type of the defect, how severe it is, and a child's age, size, and general health.

NIH: National Heart, Lung, and Blood Institute

  • Atrial septal defect (Medical Encyclopedia)
  • Bicuspid aortic valve (Medical Encyclopedia)
  • Congenital heart defect corrective surgeries (Medical Encyclopedia)
  • Congenital heart disease (Medical Encyclopedia)
  • Cyanotic heart disease (Medical Encyclopedia)
  • Dextrocardia (Medical Encyclopedia)
  • Echocardiogram -- children (Medical Encyclopedia)
  • Heart murmurs and other sounds (Medical Encyclopedia)
  • Patent ductus arteriosus (Medical Encyclopedia)
  • Ventricular septal defect (Medical Encyclopedia)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Index of Diseases and Injuries Definitions

  • And - The word "and" should be interpreted to mean either "and" or "or" when it appears in a title.
  • Code also note - A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.
  • Code first - Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • Type 1 Excludes Notes - A type 1 Excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Type 2 Excludes Notes - A type 2 Excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
  • Includes Notes - This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
  • Inclusion terms - List of terms is included under some codes. These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • NEC "Not elsewhere classifiable" - This abbreviation in the Alphabetic Index represents "other specified". When a specific code is not available for a condition, the Alphabetic Index directs the coder to the "other specified” code in the Tabular List.
  • NOS "Not otherwise specified" - This abbreviation is the equivalent of unspecified.
  • See - The "see" instruction following a main term in the Alphabetic Index indicates that another term should be referenced. It is necessary to go to the main term referenced with the "see" note to locate the correct code.
  • See Also - A "see also" instruction following a main term in the Alphabetic Index instructs that there is another main term that may also be referenced that may provide additional Alphabetic Index entries that may be useful. It is not necessary to follow the "see also" note when the original main term provides the necessary code.
  • 7th Characters - Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
  • With - The word "with" should be interpreted to mean "associated with" or "due to" when it appears in a code title, the Alphabetic Index, or an instructional note in the Tabular List. The word "with" in the Alphabetic Index is sequenced immediately following the main term, not in alphabetical order.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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