2026 ICD-10-CM Diagnosis Code P71.0Cow's milk hypocalcemia in newborn

ICD-10-CM Codes›P00–P96›P70-P74›P71

ICD-10-CM P71.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P71.0 is a billable ICD-10-CM diagnosis code for Cow's milk hypocalcemia in newborn. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within 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 Cow's milk hypocalcemia of newborn. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P71.0
Billable Status
Yes — Valid for Submission
Code Describes
Cow's milk hypocalcemia in newborn
Short Description
Cow's milk hypocalcemia in newborn
Same as the full description in the CMS dataset.
Parent Code
P71
Transitory neonatal disorders of calcium and magnesium metabolism

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP70-P74Transitory endocrine and metabolic disorders specific to newborn
CategoryP71Transitory neonatal disorders of calcium and magnesium metabolism
This CodeP71.0Cow's milk hypocalcemia in newborn

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cow's milk hypocalcemia of newborn
  • Neonatal hypocalcemia

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

Calcium

Calcium is a mineral, a nutrient that you need (in small amounts) to keep your body healthy. You have more calcium in your body than any other mineral.

The full article covers:

  • What is calcium and why do I need it?
  • How do I get calcium?
  • How much calcium do I need?

Read the full article at MedlinePlus

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

Convert P71.0 to ICD-9-CMHistory

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

ICD-9-CM
775.4 Hypocalcem/hypomagnes NB
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P71.0Overview

What is the ICD-10 code for Cow's milk hypocalcemia in newborn?

The ICD-10-CM code for Cow's milk hypocalcemia in newborn is P71.0 (sometimes written as P710). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is P71.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Cow's milk hypocalcemia in newborn on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does P71.0 group to?

When Cow's milk hypocalcemia in newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 791, 793, with relative weights from 4.0590 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.

Is P71.0 a CC or MCC?

CMS lists P71.0 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 44 closely related codes in its exclusion list.

What is the ICD-9 equivalent of P71.0?

Under the General Equivalence Mappings, Cow's milk hypocalcemia in newborn converts to ICD-9-CM 775.4 (hypocalcem/hypomagnes NB). The mapping is approximate, so confirm the match fits the documentation.