P74.6 Transitory hyperammonemia of newborn

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

MS-DRG index

Defines the logic of DRG(s) 794 in MDC 15.

Approximate ICD-9-CM (GEMs)

• 775.89 Other neonatal endocrine and metabolic disturbances (approximate)

Code annotations containing back-references to P74.6

Back-references to P74.6

• Type 1 Excludes: E72.20 Disorder of urea cycle metabolism, unspecified ("transient hyperammonemia of newborn (P74.6)")

Back-references to P74

• Type 2 Excludes: P00 Newborn affected by maternal conditions that may be unrelated to present pregnancy ("newborn affected by maternal endocrine and metabolic disorders (P70-P74)")

Diagnosis Index entries for P74.6

• Disturbance (s) › electrolyte › newborn, transitory › hyperammonemia

Nearby codes

• P74.42 Disturbances of chlorine balance of newborn
• P74.421 Hyperchloremia of newborn
• P74.422 Hypochloremia of newborn
• P74.49 Other transitory electrolyte disturbance of newborn
• P74.5 Transitory tyrosinemia of newborn
• P74.6 Transitory hyperammonemia of newborn (this code)
• P74.8 Other transitory metabolic disturbances of newborn
• P74.9 Transitory metabolic disturbance of newborn, unspecified