2020 ICD-10-CM Diagnosis Code Q02

Microcephaly

    2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
  • Q02 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM Q02 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of Q02 - other international versions of ICD-10 Q02 may differ.
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, 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.
  • , if applicable, congenital Zika virus disease
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as Q02. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • Meckel-Gruber syndrome (
    ICD-10-CM Diagnosis Code Q61.9

    Cystic kidney disease, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Meckel-Gruber syndrome
    Q61.9
    )
Includes
Includes Help
"Includes" further defines, or give examples of, the content of the code or category.
  • hydromicrocephaly
  • micrencephalon
The following code(s) above Q02 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 Q02:
  • Q00-Q99
    2020 ICD-10-CM Range Q00-Q99

    Congenital malformations, deformations and chromosomal abnormalities

    Note
    • Codes from this chapter are not for use on maternal records
    Type 2 Excludes
    • inborn errors of metabolism (E70-E88)
    Congenital malformations, deformations and chromosomal abnormalities
Approximate Synonyms
  • Congenital brain hypoplasia
  • Congenital hypoplasia of brain
  • Hydromicrocephaly
  • Microcephalus
  • Primary microcephaly
Clinical Information
  • A congenital abnormality in which the cerebrum is underdeveloped, the fontanels close prematurely, and, as a result, the head is small. (desk reference for neuroscience, 2nd ed.)
  • A congenital or acquired developmental disorder in which the circumference of the head is smaller than normal for the person's age and sex. It is the result of brain developmental delay.
  • Abnormal smallness of the brain.
  • Smallness of the head produced by incomplete development of the brain, often associated with below normal mental and cognitive development.
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Q02 is considered exempt from POA reporting.
ICD-10-CM Q02 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 091 Other disorders of nervous system with mcc
  • 092 Other disorders of nervous system with cc
  • 093 Other disorders of nervous system without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert Q02 to ICD-9-CM

Code History
  • 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
Code annotations containing back-references to Q02:
  • Type 1 Excludes: Q75
    ICD-10-CM Diagnosis Code Q75

    Other congenital malformations of skull and face bones

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • congenital malformation of face NOS (Q18.-)
    • congenital malformation syndromes classified to Q87.-
    • dentofacial anomalies [including malocclusion] (M26.-)
    • musculoskeletal deformities of head and face (Q67.0-Q67.4)
    • skull defects associated with congenital anomalies of brain such as:
    • anencephaly (Q00.0)
    • encephalocele (Q01.-)
    • hydrocephalus (Q03.-)
    • microcephaly (Q02)

Diagnosis Index entries containing back-references to Q02:
  • Absence (of) (organ or part) (complete or partial)
    • skull bone (congenital) Q75.8
      ICD-10-CM Diagnosis Code Q75.8

      Other specified congenital malformations of skull and face bones

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Absence of skull bone, congenital
      • Congenital deformity of forehead
      • Platybasia
      • with
        • microcephaly Q02
  • Agenesis
    • skull (bone) Q75.8
      ICD-10-CM Diagnosis Code Q75.8

      Other specified congenital malformations of skull and face bones

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Absence of skull bone, congenital
      • Congenital deformity of forehead
      • Platybasia
      • with
        • microcephaly Q02
  • Anomaly, anomalous (congenital) (unspecified type) Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • bone Q79.9
      ICD-10-CM Diagnosis Code Q79.9

      Congenital malformation of musculoskeletal system, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Congenital anomaly of musculoskeletal system NOS
      • Congenital deformity of musculoskeletal system NOS
      • skull Q75.9
        ICD-10-CM Diagnosis Code Q75.9

        Congenital malformation of skull and face bones, unspecified

          2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
        Applicable To
        • Congenital anomaly of face bones NOS
        • Congenital anomaly of skull NOS
        • with
          • microcephaly Q02
    • skull Q75.9
      ICD-10-CM Diagnosis Code Q75.9

      Congenital malformation of skull and face bones, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Congenital anomaly of face bones NOS
      • Congenital anomaly of skull NOS
      • with
        • microcephaly Q02
  • Deformity Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
    • skull (acquired) M95.2
      ICD-10-CM Diagnosis Code M95.2

      Other acquired deformity of head

        2016 2017 2018 2019 2020 Billable/Specific Code
      • congenital Q75.8
        ICD-10-CM Diagnosis Code Q75.8

        Other specified congenital malformations of skull and face bones

          2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
        Applicable To
        • Absence of skull bone, congenital
        • Congenital deformity of forehead
        • Platybasia
        • with
          • microcephaly Q02
  • Distortion(s) (congenital)
    • skull bone(s) Q75.8
      ICD-10-CM Diagnosis Code Q75.8

      Other specified congenital malformations of skull and face bones

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Absence of skull bone, congenital
      • Congenital deformity of forehead
      • Platybasia
      • with
        • microcephaly Q02
  • Hydromicrocephaly Q02
  • Hypoplasia, hypoplastic
    • brain Q02
    • skull (bone) Q75.8
      ICD-10-CM Diagnosis Code Q75.8

      Other specified congenital malformations of skull and face bones

        2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
      Applicable To
      • Absence of skull bone, congenital
      • Congenital deformity of forehead
      • Platybasia
      • with
        • microcephaly Q02
    • cephalic Q02
  • Idiot, idiocy (congenital) F73
    ICD-10-CM Diagnosis Code F73

    Profound intellectual disabilities

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • IQ level below 20-25
    • Profound mental subnormality
    • microcephalic Q02
  • Imperfect
    • closure (congenital)
      • skull Q75.0
        ICD-10-CM Diagnosis Code Q75.0

        Craniosynostosis

          2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
        Applicable To
        • Acrocephaly
        • Imperfect fusion of skull
        • Oxycephaly
        • Trigonocephaly
        • with
          • microcephaly Q02
  • Micrencephalon, micrencephaly Q02
  • Microcephalus, microcephalic, microcephaly Q02
  • Microencephalon Q02
  • Nondevelopment
  • Oligoencephalon Q02
  • Undeveloped, undevelopment - see also Hypoplasia
    • brain Q02 (congenital)
    • cerebral Q02 (congenital)

ICD-10-CM Codes Adjacent To Q02
Q00 Anencephaly and similar malformations
Q00.0 Anencephaly
Q00.1 Craniorachischisis
Q00.2 Iniencephaly
Q01 Encephalocele
Q01.0 Frontal encephalocele
Q01.1 Nasofrontal encephalocele
Q01.2 Occipital encephalocele
Q01.8 Encephalocele of other sites
Q01.9 Encephalocele, unspecified
Q02 Microcephaly
Q03 Congenital hydrocephalus
Q03.0 Malformations of aqueduct of Sylvius
Q03.1 Atresia of foramina of Magendie and Luschka
Q03.8 Other congenital hydrocephalus
Q03.9 Congenital hydrocephalus, unspecified
Q04 Other congenital malformations of brain
Q04.0 Congenital malformations of corpus callosum
Q04.1 Arhinencephaly
Q04.2 Holoprosencephaly
Q04.3 Other reduction deformities of brain

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.