ICD-10-CM › Q04 Q04.3 Other reduction deformities of brainBillable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.
Applicable to Absence of part of brain Agenesis of part of brain Agyria Aplasia of part of brain Hydranencephaly Hypoplasia of part of brain Lissencephaly Microgyria Pachygyria Excludes1 (never code together) congenital malformations of corpus callosum (Q04.0) 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) 742.2 Congenital reduction deformities of brain (approximate)Diagnosis Index entries for Q04.3 Absence (of) (organ or part) (complete or partial) › brain › part of Absence (of) (organ or part) (complete or partial) › cerebellum (vermis) Agenesis › brain › part of Agenesis › cerebellum Agenesis › vermis of cerebellum Agyria Aplasia › brain › part of Aplasia › cerebellum Deformity › brain (congenital) › reduction Deformity › reduction (extremity) (limb), congenital › brain Hydrancephaly, hydranencephaly Hypoplasia, hypoplastic › brain › gyri Hypoplasia, hypoplastic › brain › part of Hypoplasia, hypoplastic › cerebellum Lissencephalia, lissencephaly Microgyria (congenital) Nondevelopment › brain › part of Pachygyria Nearby codes Q04Q04.0Q04.1Q04.2Q04.3 Other reduction deformities of brain (this code)Q04.4Q04.5Q04.6Q04.8Q04.9