ICD-10-CM > P00-P96 > P70-P74 > P74 > P74.4 > P74.42 > P74.421 P74.421 Hyperchloremia of newborn Billable/Specific Copy Code Copy Description Applicable To Hyperchloremic metabolic acidosis Type 2 Excludes late metabolic acidosis of the newborn (P74.0)