2026 ICD-10-CM Diagnosis Code P71.3Neonatal tetany without calcium or magnesium deficiency

ICD-10-CM Codes›P00–P96›P70-P74›P71

ICD-10-CM P71.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P71.3 is a billable ICD-10-CM diagnosis code for neonatal tetany without calcium or magnesium deficiency. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as carpopedal spasm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P71.3
Billable Status
Yes — Valid for Submission
Code Describes
Neonatal tetany without calcium or magnesium deficiency
Short Description
Neonatal tetany without calcium or magnesium deficiency
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 CodeP71.3Neonatal tetany without calcium or magnesium deficiency

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carpopedal spasm
  • Early neonatal hypocalcemic tetany
  • Neonatal hypocalcemic tetany
  • Neonatal tetany without calcium deficiency
  • Neonatal tetany without magnesium deficiency
  • Tetany

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Neonatal tetany NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Tetany(due to)
      • neonatal (without calcium or magnesium deficiency)

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

Clinical InformationClinical

  • Tetany

    a disorder characterized by muscle twitches, cramps, and carpopedal spasm, and when severe, laryngospasm and seizures. this condition is associated with unstable depolarization of axonal membranes, primarily in the peripheral nervous system. tetany usually results from hypocalcemia or reduced serum levels of magnesium that may be associated with hyperventilation; hypoparathyroidism; rickets; uremia; or other conditions. (from adams et al., principles of neurology, 6th ed, p1490)

  • Tetany

    sudden and involuntary contraction of a muscle of group of muscles due to hypocalcemia.

Patient EducationClinical

Fluid and Electrolyte Balance

Electrolytes are minerals that have an electric charge when they are dissolved in water or body fluids, including blood. The electric charge can be positive or negative. You have electrolytes in your blood, urine (pee), tissues, and other body fluids.

The full article covers:

  • What are electrolytes?
  • What are the different types of electrolytes in your body?
  • What is an electrolyte imbalance?
  • What are the different types of electrolyte imbalances?
  • How are electrolyte imbalances diagnosed?
  • What are the treatments for electrolyte imbalances?

Read the full article at MedlinePlus

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

Convert P71.3 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 P71.3Overview

Is P71.3 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report neonatal tetany without calcium or magnesium deficiency on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P71.3?

Under the General Equivalence Mappings, neonatal tetany without calcium or magnesium deficiency converts to ICD-9-CM 775.4 (hypocalcem/hypomagnes NB). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.