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    v1.0.28
    OpenPayerBilling CodesCongenital malformations of the nervous systemICD-10-CM q02-microcephaly
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    ICD-10-CM Code For Microcephaly: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Q02 includes congenital microcephaly and related diagnostic terms used to describe infants and children with unusually small head circumference and associated developmental or neurological findings. These ICD-10-CM diagnosis codes are used to document congenital structural brain growth abnormalities, capture severity and associated neurological involvement, and distinguish isolated microcephaly from microcephaly with other congenital anomalies. Accurate coding within the ICD-10-CM Q02 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM Q02: Microcephaly Overview

    The ICD-10-CM Q02 group represents congenital microcephaly, a developmental condition characterized by a smaller-than-expected head size with associated neurological implications. These diagnoses target the central nervous system and reflect prenatal or perinatal brain growth disturbances. Accurate coding matters for clinical documentation and can affect reimbursement by ensuring the severity and congenital nature of the condition are clearly conveyed.

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    When to Use

    Use a code from this group when documenting an infant or child diagnosed with microcephaly confirmed by clinical measurement and assessment of head circumference relative to growth standards. Select specific codes within the group to reflect whether microcephaly is isolated or accompanied by additional congenital anomalies or known syndromes.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    Q02Microcephaly

    DRG Codes

    5 rows

    DRG CodeDescription
    091Other Disorders of Nervous System with MCC
    092Other Disorders of Nervous System with CC
    093Other Disorders of Nervous System without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • A newborn infant delivered at term is noted on immediate neonatal physical examination to have an abnormally small head circumference well below the 3rd percentile for gestational age, with otherwise stable vital signs; the infant is brought to the neonatal team for evaluation of suspected congenital microcephaly, and the diagnosis code is assigned based on head size measurements and congenital onset. Typical codes: Q02.
    • A pediatric patient in early childhood is followed in developmental clinic for delayed motor and speech milestones; head growth charts show a persistently small occipital-frontal circumference documented since birth, prompting ongoing neurology and genetics assessment and coding of the congenital head size abnormality as part of the chronic developmental condition. Typical codes: Q02.
    • A pregnant woman presents for prenatal ultrasound that reveals severe fetal microcephaly with associated intracranial abnormalities; the finding is documented in the maternal and fetal records for prenatal counseling and perinatal planning, and the microcephaly finding is coded to reflect the congenital cranial size abnormality. Typical codes: Q02.

    Related Codes

    Q00-ANENCEPHALY-AND-SIMILAR-MALFORMATIONS

    ICD-10-CM Code For Anencephaly And Similar Malformations: Group Overview

    Q01-ENCEPHALOCELE

    ICD-10-CM Code For Encephalocele: Group Overview

    Q03-CONGENITAL-HYDROCEPHALUS

    ICD-10-CM Code For Congenital Hydrocephalus: Group Overview

    Q04-OTHER-CONGENITAL-MALFORMATIONS-OF-BRAIN

    ICD-10-CM Code For Other Congenital Malformations Of Brain: Group Overview

    Q05-SPINA-BIFIDA

    ICD-10-CM Code For Spina Bifida: Group Overview

    Q06-OTHER-CONGENITAL-MALFORMATIONS-OF-SPINAL-CORD

    ICD-10-CM Code For Other Congenital Malformations Of Spinal Cord: Group Overview

    Q07-OTHER-CONGENITAL-MALFORMATIONS-NERVOUS-SYSTEM

    ICD-10-CM Code For Other Congenital Malformations Of Nervous System: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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