ICD-10-CM › Q04 Q04.8 Other specified congenital malformations of brainBillable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.
Applicable to Arnold-Chiari syndrome, type IV Macrogyria Applies from Q04 Other congenital malformations of brain Excludes1 (never code together) cyclopia (Q87.0) macrocephaly (Q75.3) 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) 742.4 Other specified congenital anomalies of brain (approximate)Code annotations containing back-references to Q04.8 Back-references to Q04.8 Type 1 Excludes: Q07.0 Diagnosis Index entries for Q04.8 Anomaly, anomalous (congenital) (unspecified type) › meninges › cerebral Arnold-Chiari disease, obstruction or syndrome (type II) › type IV Deformity › meninges or membrane (congenital) › cerebral Dilatation › ventricular, ventricle (acute) (chronic) › cerebral, congenital Displacement, displaced › brain stem, caudal (congenital) Displacement, displaced › cerebellum, caudal (congenital) Distortion (s) (congenital) › gyri Ectopic, ectopia (congenital) › brain Ectopic, ectopia (congenital) › cerebral Heterotopia, heterotopic › cerebralis Macrogyria (congenital) Malformation (congenital) › brain (multiple) › specified type NEC Malformation (congenital) › meninges or membrane (congenital) › cerebral Malposition › congenital › brain tissue Softening › brain (necrotic) (progressive) › congenital Ulegyria Nearby codes Q04.2Q04.3Q04.4Q04.5Q04.6Q04.8 Other specified congenital malformations of brain (this code)Q04.9