2027 ICD-10-CM Diagnosis Code P74.0Late metabolic acidosis of newborn

ICD-10-CM Codes›P00–P96›P70-P74›P74

ICD-10-CM P74.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

P74.0 is a billable ICD-10-CM diagnosis code for late metabolic acidosis of newborn. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 44 closely related codes. Coders also document this condition as infantile encephalopathy AND lactic acidosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P74.0
Billable Status
Yes — Valid for Submission
Code Describes
Late metabolic acidosis of newborn
Short Description
Late metabolic acidosis of newborn
Same as the full description in the CMS dataset.
Parent Code
P74
Other transitory neonatal electrolyte and metabolic disturbances

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP70-P74Transitory endocrine and metabolic disorders specific to newborn
CategoryP74Other transitory neonatal electrolyte and metabolic disturbances
This CodeP74.0Late metabolic acidosis of newborn

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infantile encephalopathy AND lactic acidosis
  • Lactic acidosis
  • Late metabolic acidosis of newborn
  • Mitochondrial myopathy, lactic acidosis, deafness syndrome
  • Neonatal acidosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to P74.0: its own notes plus those printed at block P70-P74 and Chapter 16. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Block P70-P74 Transitory endocrine and metabolic disorders specific to newborn applies to 33 codes
  • transitory endocrine and metabolic disturbances caused by the infant's response to maternal endocrine and metabolic factors, or its adjustment to extrauterine environment
From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • (fetal) metabolic acidosis of newborn (P19)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

Notes

General instructions on how these codes are used.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • Codes from this chapter are for use on newborn records only, never on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name P74.0, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming P74.0: they are not reported together with it, unless the two conditions are unrelated.

  • P84 Other problems with newborn
    late metabolic acidosis of newborn (P74.0)
  • Chapter 4 (E00-E89) Endocrine, nutritional and metabolic diseases
    transitory endocrine and metabolic disorders specific to newborn (P70-P74) names P70-P74, which includes this code

Excludes2 2

These codes carry an Excludes2 note naming P74.0: its condition is not part of those codes, and both may be reported when the patient has both.

  • P74.421 Hyperchloremia of newborn
    late metabolic acidosis of the newborn (P74.0)
  • P00 Newborn affected by maternal conditions that may be unrelated to present pregnancy
    newborn affected by maternal endocrine and metabolic disorders (P70-P74) names P70-P74, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL013
Other specified and unspecified perinatal conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Metabolic Disorders

Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert P74.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
775.7 Late metab acidosis NB
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About P74.0Overview

What is the ICD-10 code for late metabolic acidosis of newborn?

The ICD-10-CM code for late metabolic acidosis of newborn is P74.0 (sometimes written as P740). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is P74.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report late metabolic acidosis of newborn on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does P74.0 group to?

When late metabolic acidosis of newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is P74.0 a CC or MCC?

CMS lists P74.0 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 44 closely related codes in its exclusion list.

Can P74.0 be reported with P19?

Not as a rule. The Excludes1 note on P74.0 lists "(fetal) metabolic acidosis of newborn (P19)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).