2026 ICD-10-CM Diagnosis Code P71.1Other neonatal hypocalcemia

ICD-10-CM Codes›P00–P96›P70-P74›P71

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

P71.1 is a billable ICD-10-CM diagnosis code for other neonatal hypocalcemia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as hypocalcemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P71.1
Billable Status
Yes — Valid for Submission
Code Describes
Other neonatal hypocalcemia
Short Description
Other neonatal hypocalcemia
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 CodeP71.1Other neonatal hypocalcemia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hypocalcemia
  • Hypocalcemic rickets
  • Late neonatal hypocalcemia
  • Neonatal hypocalcemia
  • Phosphate-loading hypocalcemia
  • Serum calcium below reference range

Tabular List NotesGuidance

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

Type 1 Excludes

  • neonatal hypoparathyroidism P71.4

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.

    • Hypocalcemia
      • neonatal
    • Hypocalcemia
      • phosphate-loading (newborn)

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

  • Hypocalcemia

    reduction of the blood calcium below normal. manifestations include hyperactive deep tendon reflexes, chvostek's sign, muscle and abdominal cramps, and carpopedal spasm. (dorland, 27th ed)

  • Grade 1 Hypocalcemia, CTCAE|Grade 1 Hypocalcemia

    corrected serum calcium of

  • Grade 2 Hypocalcemia, CTCAE|Grade 2 Hypocalcemia

    corrected serum calcium of <8.0 - 7.0 mg/dl; <2.0 - 1.75 mmol/l; ionized calcium <1.0 - 0.9 mmol/l; symptomatic

  • Grade 3 Hypocalcemia, CTCAE|Grade 3 Hypocalcemia

    corrected serum calcium of <7.0 - 6.0 mg/dl; <1.75 - 1.5 mmol/l; ionized calcium <0.9 - 0.8 mmol/l; hospitalization indicated

  • Familial Hypercalciuric Hypocalcemia

    a hereditary condition caused by calcium sensing receptor gene mutations, resulting in calcium-hypersensitivity, and compensatory hypocalcemia and hypercalciuria.

  • Grade 1 Hypocalcemia, CTCAE|Grade 1 Hypocalcemia

    corrected serum calcium of

  • Grade 2 Hypocalcemia, CTCAE|Grade 2 Hypocalcemia

    corrected serum calcium of <8.0-7.0 mg/dl; <2.0-1.75 mmol/l; ionized calcium <1.0-0.9 mmol/l; symptomatic

  • Grade 3 Hypocalcemia, CTCAE|Grade 3 Hypocalcemia

    corrected serum calcium of <7.0-6.0 mg/dl; <1.75-1.5 mmol/l; ionized calcium <0.9-0.8 mmol/l; hospitalization indicated

  • Grade 4 Hypocalcemia, CTCAE|Grade 4 Hypocalcemia

    corrected serum calcium of <6.0 mg/dl; <1.5 mmol/l; ionized calcium <0.8 mmol/l; life-threatening consequences

  • Grade 5 Hypocalcemia, CTCAE|Grade 5 Hypocalcemia

    death

  • Hypocalcemia

    lower than normal levels of calcium in the circulating blood.

  • Hypocalcemia, CTCAE|Hypocalcemia|Hypocalcemia

    a disorder characterized by laboratory test results that indicate a low concentration of calcium (corrected for albumin) in the blood.

  • TRPM6 wt Allele|CHAK2|FLJ22628|HMGX|HOMG|HOMG1|HSH|Hypomagnesemia, Secondary Hypocalcemia Gene|Transient Receptor Potential Cation Channel Subfamily M Member 6 wt Allele|Transient Receptor Potential Cation Channel, Subfamily M, Member 6 Gene

    human trpm6 wild-type allele is located in the vicinity of 9q21.13 and is approximately 166 kb in length. this allele, which encodes transient receptor potential cation channel subfamily m member 6 protein, is involved in both magnesium homeostasis and protein phosphorylation. mutation of the gene is associated with hypomagnesemia.

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 P71.1 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 P71.1Overview

Is P71.1 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other neonatal hypocalcemia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of P71.1?

Under the General Equivalence Mappings, other neonatal hypocalcemia 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.