Q02 Microcephaly

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Includes

• hydromicrocephaly
• micrencephalon

Excludes1 (never code together)

• Meckel-Gruber syndrome (Q61.9)

Code first

• , if applicable, congenital Zika virus disease

Applies from Q02 Microcephaly

Includes

• hydromicrocephaly
• micrencephalon

Excludes1 (never code together)

• Meckel-Gruber syndrome (Q61.9)

Code first

• , if applicable, congenital Zika virus disease

Risk adjustment (HCC)

• CMS-HCC V28: HCC 182 — Spinal Cord Disorders/Injuries
• CMS-HCC V22: HCC 72 — Spinal Cord Disorders/Injuries
• RxHCC V08: HCC 155 — Spinal Cord Disorders
• ESRD V24: HCC 72

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 742.1 Microcephalus

Code annotations containing back-references to Q02

Back-references to Q02

• Type 1 Excludes: Q75 Other congenital malformations of skull and face bones ("microcephaly (Q02)")
• Use Additional: Q87.88 CTNNB1 syndrome ("microcephaly (Q02)")

Back-references to Q02

• Type 1 Excludes: Q75 Other congenital malformations of skull and face bones ("microcephaly (Q02)")
• Use Additional: Q87.88 CTNNB1 syndrome ("microcephaly (Q02)")

Diagnosis Index entries for Q02

• Absence (of) (organ or part) (complete or partial) › skull bone (congenital) › with › microcephaly
• Agenesis › skull (bone) › with › microcephaly
• Anomaly, anomalous (congenital) (unspecified type) › bone › skull › with › microcephaly
• Anomaly, anomalous (congenital) (unspecified type) › skull › with › microcephaly
• Deformity › skull (acquired) › congenital › with › microcephaly
• Distortion (s) (congenital) › skull bone (s) NEC › with › microcephaly
• Hydromicrocephaly
• Hypoplasia, hypoplastic › brain
• Hypoplasia, hypoplastic › cephalic
• Hypoplasia, hypoplastic › skull (bone) › with › microcephaly
• Idiot, idiocy (congenital) › microcephalic
• Imperfect › closure (congenital) › skull › with › microcephaly
• Micrencephalon, micrencephaly
• Microcephalus, microcephalic, microcephaly
• Microencephalon
• Nondevelopment › brain
• Oligoencephalon
• Undeveloped, undevelopment › brain (congenital)
• Undeveloped, undevelopment › cerebral (congenital)

Nearby codes

• Q02 Microcephaly (this code)