2024 ICD-10-CM Diagnosis Code E83.42


ICD-10-CM Code:
Short Description:
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Endocrine, nutritional and metabolic diseases
    • Metabolic disorders
      • Disorders of mineral metabolism

E83.42 is a billable diagnosis code used to specify a medical diagnosis of hypomagnesemia. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Autosomal dominant primary hypomagnesemia with hypocalciuria
  • Drug-induced hypomagnesemia
  • Familial hypomagnesemia hypercalciuria nephrocalcinosis with severe ocular involvement
  • Familial hypomagnesemia-hypercalciuria
  • Familial hypomagnesemia-hypercalciuria
  • Familial hypomagnesemia-hypercalciuria
  • Familial primary hypomagnesemia with hypercalciuria and nephrocalcinosis without severe ocular involvement
  • Familial primary hypomagnesemia with normocalciuria
  • Familial primary hypomagnesemia with normocalciuria and normocalcemia
  • Hypocalcemic tetany
  • Hypocalciuria
  • Hypomagnesemia
  • Hypomagnesemia co-occurrent with normocalciuria
  • Hypomagnesemia with secondary hypocalcemia
  • Isolated autosomal dominant hypomagnesemia Glaudemans type
  • Isolated familial intestinal hypomagnesemia
  • Isolated familial renal hypomagnesemia
  • Nephrocalcinosis
  • Parathyroid hypocalcemic tetany
  • Primary hypomagnesemia
  • Secondary hypomagnesemia
  • Secondary hypomagnesemia
  • Tetany

Clinical Classification

Clinical Category:
Other specified and unspecified nutritional and metabolic disorders
CCSR Category Code:
Inpatient Default CCSR:
Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.
Outpatient Default CCSR:
Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Clinical Information

  • 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)
  • Nephrocalcinosis - a condition characterized by calcification of the renal tissue itself. it is usually seen in distal renal tubular acidosis with calcium deposition in the distal kidney tubules and the surrounding interstitium. nephrocalcinosis causes renal insufficiency.
  • Familial Primary Hypomagnesemia - a hereditary disorder that leads to a selective defect in renal or intestinal magnesium absorption, resulting in a low serum magnesium concentration.
  • Grade 1 Hypomagnesemia, CTCAE|Grade 1 Hypomagnesemia -
  • Grade 2 Hypomagnesemia, CTCAE|Grade 2 Hypomagnesemia - <1.2-0.9 mg/dl; <0.5-0.4 mmol/l
  • Grade 3 Hypomagnesemia, CTCAE|Grade 3 Hypomagnesemia - <0.9-0.7 mg/dl; <0.4-0.3 mmol/l
  • Grade 4 Hypomagnesemia, CTCAE|Grade 4 Hypomagnesemia - <0.7 mg/dl; <0.3 mmol/l; life-threatening consequences
  • Grade 5 Hypomagnesemia, CTCAE|Grade 5 Hypomagnesemia - death
  • Hypomagnesemia - lower than normal levels of magnesium in the circulating blood.
  • Hypomagnesemia, CTCAE|Hypomagnesemia|Hypomagnesemia - a disorder characterized by laboratory test results that indicate a low concentration of magnesium 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.
  • Tetany - sudden and involuntary contraction of a muscle of group of muscles due to hypocalcemia.
  • Nephrocalcinosis - deposition of calcium in the renal parenchyma, resulting from high levels of calcium in the blood and/or urine.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert E83.42 to ICD-9-CM

  • ICD-9-CM Code: 275.2 - Dis magnesium metabolism
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education

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. Your body can use this fuel right away, or it can store the energy in your body tissues, such as your liver, muscles, and body fat.

A metabolic disorder occurs when abnormal chemical reactions in your body disrupt this process. When this happens, you might have too much of some substances or too little of other ones that you need to stay healthy. There are different groups of disorders. Some affect the breakdown of amino acids, carbohydrates, or lipids. Another group, mitochondrial diseases, affects the parts of the cells that produce the energy.

You can develop a metabolic disorder when some organs, such as your liver or pancreas, become diseased or do not function normally. Diabetes is an example.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.


[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.