P74.421 – Hyperchloremia of newborn

ICD-10-CM 2027 diagnosis code · Transitory endocrine and metabolic disorders specific to newborn

Billable code

ICD-10-CM code P74.421

Code: P74.421 (claims format: P74421)
Description: Hyperchloremia of newborn
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 16. Certain conditions originating in the perinatal period (P00-P96)
Block: P70-P74 Transitory endocrine and metabolic disorders specific to newborn
Parent codes: P74 › P74.4 › P74.42

Notes for P74.421

Applicable to:

Hyperchloremic metabolic acidosis

Excludes2 (not included here):

late metabolic acidosis of the newborn (P74.0)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block P70-P74

Includes:

transitory endocrine and metabolic disturbances caused by the infant's response to maternal endocrine and metabolic factors, or its adjustment to extrauterine environment

Index terms for P74.421

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in P74.42

P74.422 – Hypochloremia of newbornBillable

Frequently asked questions

What is ICD-10 code P74.421?

P74.421 is the ICD-10-CM code for hyperchloremia of newborn, in the block P70-P74 (Transitory endocrine and metabolic disorders specific to newborn).

Is P74.421 a billable code?

Yes. P74.421 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does P74.421 belong to?

It belongs to category P74 – Other transitory neonatal electrolyte and metabolic disturbances.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.