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normal pressure hydrocephalus
- G91.1 Obstructive hydrocephalus
- G91.2 (Idiopathic) normal pressure hydrocephalus
- Normal pressure hydrocephalus NOS
- G91.3 Post-traumatic hydrocephalus, unspecified
- G91.4 Hydrocephalus in diseases classified elsewhere
- Code first underlying condition, such as:
- congenital syphilis (A50.4-)
- neoplasm (C00-D48)
- Excludes1: hydrocephalus due to congenital toxoplasmosis (P37.1)
- Code first underlying condition, such as:
- G91.8 Other hydrocephalus
- G91.9 Hydrocephalus, unspecified
G92 Toxic encephalopathy
- Toxic encephalitis
- Toxic metabolic encephalopathy
- Code first (T51-T65) to identify toxic agent.
G93 Other disorders of brain
- G93.0 Cerebral cysts
- Arachnoid cyst
- Porencephalic cyst, acquired
- Excludes1: acquired periventricular cysts of newborn (P91.1)
- congenital cerebral cysts (Q04.6)
- G93.1 Anoxic brain damage, not elsewhere classified
- Excludes1: cerebral anoxia due to anesthesia during labor and delivery (O74.3)
- cerebral anoxia due to anesthesia during the puerperium (O89.2)
- neonatal anoxia (P28.9)
- Excludes1: cerebral anoxia due to anesthesia during labor and delivery (O74.3)
- G93.2 Benign intracranial hypertension
- Excludes1: hypertensive encephalopathy (I67.4)
- G93.3 Postviral fatigue syndrome
- Benign myalgic encephalomyelitis
- Excludes1: chronic fatigue syndrome NOS (R53.82)
- G93.4 Other and unspecified encephalopathy
- Excludes1: alcoholic encephalopathy (G31.2)
- hypertensive encephalopathy (I67.4)
- toxic (metabolic) encephalopathy (G92)
- G93.40 Encephalopathy, unspecified
- G93.41 Metabolic encephalopathy
- Septic encephalopathy
- G93.49 Other encephalopathy
- Encephalopathy NEC
- Excludes1: alcoholic encephalopathy (G31.2)
- G93.5 Compression of brain
- Arnold-Chiari type 1 compression of brain
- Compression of brain (stem)
- Herniation
