Q04.3

ICD-10Billable

Other reduction deformities of brain

Official ICD-10-CM descriptor (FY2026)

Other reduction deformities of brain

Q04.3 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • 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

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • congenital malformations of corpus callosum (Q04.0)

Related codes in Q04

Where this code sits

Parent code
Q04

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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