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G93.42

Megalencephalic leukoencephalopathy with subcortical cysts

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 12 never code together
G93.4code
Excludes2
  • alcoholic encephalopathy (G31.2)G31.2
  • encephalopathy in diseases classified elsewhere (G94)G94
  • hypertensive encephalopathy (I67.4)I67.4
  • toxic (metabolic) encephalopathy (G92.8)G92.8
G00-G99chapter
Excludes2
  • certain conditions originating in the perinatal period (P04-P96)P04-P96
  • certain infectious and parasitic diseases (A00-B99)A00-B99
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
  • endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
  • injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
  • neoplasms (C00-D49)C00-D49
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes

No further instructional notes apply.

Index entries leading here 1
  • Leukoencephalopathy G93.49
    • megalencephalic, with subcortical cysts G93.42
Alongside this code 6 same parent — G93.4
G93.40 Encephalopathy, unspecified G93.41 Metabolic encephalopathy 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
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS28HCC200 ESRD21HCC52 ESRD24HCC52

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This code

Billable
yes
Code set
FY2026
Parent
G93.4
Block
G89-G99
Siblings
6

Present FY2024–FY2027.