G93.42

Megalencephalic leukoencephalopathy with subcortical cysts

Risk-adjusting (HCC)Billable code

HCC risk adjustment mapping

CMS-HCC V28

HCC200

Friedreich and Other Hereditary Ataxias; Huntington Disease

CMS-HCC ESRD V24

HCC52

Dementia Without Complication

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

Inherited from G93.4Other and unspecified encephalopathy
Excludes 2

alcoholic encephalopathy (G31.2) encephalopathy in diseases classified elsewhere (G94) hypertensive encephalopathy (I67.4) toxic (metabolic) encephalopathy (G92.8)

Inherited from chapter 6Diseases of the nervous system
Excludes 2

certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Official Guidelines for G93.42

FY 2026 ›
I.C.6Chapter-specific guidanceChapter 6: Diseases of the Nervous System (G00-G99)

Subsections

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