Congenital malformations, deformations and chromosomal abnormalities
Chromosomal abnormalities, not elsewhere classified
2021 ICD-10-CM Diagnosis Code Q90
2021 ICD-10-CM Diagnosis Code Q90
2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code
- Q90 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
- The 2021 edition of ICD-10-CM Q90 became effective on October 1, 2020.
- This is the American ICD-10-CM version of Q90 - other international versions of ICD-10 Q90 may differ.
Use Additional Help
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. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
- code(s) to identify any associated physical conditions and degree of intellectual disabilities (F70-F79
ICD-10-CM Range F70-F79
- any associated physical or developmental disorders
Type 1 Excludes
- borderline intellectual functioning, IQ above 70 to 84 (R41.83)
- F70 Mild intellectual disabilities
- F71 Moderate intellectual disabilities
- F72 Severe intellectual disabilities
- F73 Profound intellectual disabilities
- F78 Other intellectual disabilities
- F79 Unspecified intellectual disabilities
The following code(s) above Q90
contain 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 Q90
- A chromosomal abnormality consisting of the presence of a third copy of chromosome 21 in somatic cells.
- A chromosomal dysgenesis syndrome resulting from a triplication or translocation of chromosome 21. Down syndrome occurs in approximately 1:700 live births. Abnormalities are variable from individual to individual and may include mental retardation, retarded growth, flat hypoplastic face with short nose, prominent epicanthic skin folds, small low-set ears with prominent antihelix, fissured and thickened tongue, laxness of joint ligaments, pelvic dysplasia, broad hands and feet, stubby fingers, transverse palmar crease, lenticular opacities and heart disease. Patients with down syndrome have an estimated 10 to 30-fold increased risk for leukemia; most have symptoms of alzheimer's disease by age 40. Also known as trisomy 21 syndrome.
- A chromosome disorder associated either with an extra chromosome 21 or an effective trisomy for chromosome 21. Clinical manifestations include hypotonia, short stature, brachycephaly, upslanting palpebral fissures, epicanthus, brushfield spots on the iris, protruding tongue, small ears, short, broad hands, fifth finger clinodactyly, simian crease, and moderate to severe intellectual disability. Cardiac and gastrointestinal malformations, a marked increase in the incidence of leukemia, and the early onset of alzheimer disease are also associated with this condition. Pathologic features include the development of neurofibrillary tangles in neurons and the deposition of amyloid beta-protein, similar to the pathology of alzheimer disease. (menkes, textbook of child neurology, 5th ed, p213)
- A disorder caused by the presence of an extra chromosome 21 and characterized by mental retardation and distinguishing physical features.
- Chromosome disorder associated either with an extra chromosome 21 or an effective trisomy for chromosome 21; clinical manifestations include hypotonia, short stature, brachycephaly, upslanting palpebral fissures, epicanthus, brushfield spots on the iris, protruding tongue, small ears, short, broad hands, fifth finger clinodactyly, simian crease, and moderate to severe mental retardation.
- Down syndrome is set of mental and physical symptoms that result from having an extra copy of chromosome 21. Even though people with down syndrome may have some physical and mental features in common, symptoms of down syndrome can range from mild to severe. Usually, mental development and physical development are slower in people with down syndrome than in those without it.people with the syndrome may also have other health problems. They may be born with heart disease. They may have dementia. They may have hearing problems and problems with the intestines, eyes, thyroid and skeleton.the chance of having a baby with down syndrome increases as a woman gets older. Down syndrome cannot be cured. However, many people with down syndrome live productive lives well into adulthood. nih: national institute of child health and human development
- The most frequently occurring mental retardation/multiple anomaly syndrome usually involving more than 100 individual defects. Typical facies with upslanting palpebral fissures is the characteristic feature of this syndrome (hence the offensive designations "mongoloid idiocy" and "mongolism"). A wide range other defects, such as congenital heart diseases, respiratory disorders, and leukemia, may be associated. Down syndrome patients who survive into late adulthood may develop alzheimer syndrome.
- 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
ICD-10-CM Codes Adjacent To Q90
Congenital absence and malformations of spleen
Congenital malformations of spleen
Congenital malformations of adrenal gland
Congenital malformations of other endocrine glands
Multiple congenital malformations, not elsewhere classified
Other specified congenital malformations
Congenital malformation, unspecified
Trisomy 21, nonmosaicism (meiotic nondisjunction)
Trisomy 21, mosaicism (mitotic nondisjunction)
Trisomy 21, translocation
Down syndrome, unspecified
Trisomy 18 and Trisomy 13
Trisomy 18, nonmosaicism (meiotic nondisjunction)
Trisomy 18, mosaicism (mitotic nondisjunction)
Trisomy 18, translocation
Trisomy 18, unspecified
Trisomy 13, nonmosaicism (meiotic nondisjunction)
Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.