G93.5 Compression of brain

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Arnold-Chiari type 1 compression of brain
• Compression of brain (stem)
• Herniation of brain (stem)

Excludes1 (never code together)

• traumatic compression of brain (S06.A-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 202 — Coma, Brain Compression/Anoxic Damage
• CMS-HCC V22: HCC 80 — Coma, Brain Compression/Anoxic Damage
• ESRD V24: HCC 80

MS-DRG index

Defines the logic of DRG(s) 080-081 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 348.4 Compression of brain

Diagnosis Index entries for G93.5

• Chiari's › malformation › type I
• Compression › brain (stem)
• Compression › brain (stem) › nontraumatic
• Hernia, hernial (acquired) (recurrent) › foramen magnum
• Herniation › brain (stem)
• Herniation › brain (stem) › nontraumatic
• Herniation › cerebral
• Herniation › cerebral › nontraumatic
• Malformation (congenital) › Chiari › Type I
• Pressure › brain
• Pressure › cone, tentorial
• Syndrome › foramen magnum
• Syndrome › posterior › fossa compression

Nearby codes

• G93.42 Megalencephalic leukoencephalopathy with subcortical cysts
• G93.43 Leukoencephalopathy with calcifications and cysts
• G93.44 Adult-onset leukodystrophy with axonal spheroids
• G93.45 Developmental and epileptic encephalopathy
• G93.49 Other encephalopathy
• G93.5 Compression of brain (this code)
• G93.6 Cerebral edema
• G93.7 Reye's syndrome
• G93.8 Other specified disorders of brain
• G93.81 Temporal sclerosis
• G93.82 Brain death