2018 ICD-10-CM Diagnosis Code Q90

Down syndrome

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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

    Intellectual disabilities

    Code First
    • 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
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:
  • Q00-Q99
    2018 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • Codes from this chapter are not for use on maternal or fetal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
  • Q90-Q99
    2018 ICD-10-CM Range Q90-Q99

    Chromosomal abnormalities, not elsewhere classified

    Type 2 Excludes
    • mitochondrial metabolic disorders (E88.4-)
    Chromosomal abnormalities, not elsewhere classified
Clinical Information Code History
ICD-10-CM Codes Adjacent To Q90
Q89.0 Congenital absence and malformations of spleen
Q89.01 Asplenia (congenital)
Q89.09 Congenital malformations of spleen
Q89.1 Congenital malformations of adrenal gland
Q89.2 Congenital malformations of other endocrine glands
Q89.3 Situs inversus
Q89.4 Conjoined twins
Q89.7 Multiple congenital malformations, not elsewhere classified
Q89.8 Other specified congenital malformations
Q89.9 Congenital malformation, unspecified
Q90 Down syndrome
Q90.0 Trisomy 21, nonmosaicism (meiotic nondisjunction)
Q90.1 Trisomy 21, mosaicism (mitotic nondisjunction)
Q90.2 Trisomy 21, translocation
Q90.9 Down syndrome, unspecified
Q91 Trisomy 18 and Trisomy 13
Q91.0 Trisomy 18, nonmosaicism (meiotic nondisjunction)
Q91.1 Trisomy 18, mosaicism (mitotic nondisjunction)
Q91.2 Trisomy 18, translocation
Q91.3 Trisomy 18, unspecified
Q91.4 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.