G93.7 Reye's syndrome

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

Code first

• poisoning due to salicylates, if applicable (T39.0-, with sixth character 1-4)

Use additional code

• code for adverse effect due to salicylates, if applicable (T39.0-, with sixth character 5)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 127 — Dementia, Mild or Unspecified
• RxHCC V08: HCC 112 — Dementia, Except Alzheimer's Disease
• ESRD V24: HCC 52

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 331.81 Reye's syndrome

Medicare Code Edits (MCE v43.1 (April 2026))

• Pediatric diagnoses (age 0 through 17): Age conflict edit. These diagnoses are clinically expected only in patients age 0 through 17.

Code annotations containing back-references to G93.7

Back-references to G93.7

• Type 1 Excludes: E88.4 Mitochondrial metabolism disorders ("Reye's syndrome (G93.7)")
• Type 2 Excludes: G31 Other degenerative diseases of nervous system, not elsewhere classified ("Reye's syndrome (G93.7)")
• Type 1 Excludes: G71.3 Mitochondrial myopathy, not elsewhere classified ("Reye's syndrome (G93.7)")

Diagnosis Index entries for G93.7

• Reye's syndrome
• Syndrome › Reye's

Nearby codes

• G93.44 Adult-onset leukodystrophy with axonal spheroids
• G93.45 Developmental and epileptic encephalopathy
• G93.49 Other encephalopathy
• G93.5 Compression of brain
• G93.6 Cerebral edema
• G93.7 Reye's syndrome (this code)
• G93.8 Other specified disorders of brain
• G93.81 Temporal sclerosis
• G93.82 Brain death
• G93.89 Other specified disorders of brain
• G93.9 Disorder of brain, unspecified