2027 ICD-10-CM Diagnosis Code E83.42Hypomagnesemia
ICD-10-CM Codes›E00–E89›E70-E88›E83
- Billable — Valid for Submission
- Not Chronic
E83.42 is a billable ICD-10-CM diagnosis code for hypomagnesemia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 640 through 641. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified nutritional and metabolic disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Autosomal dominant primary hypomagnesemia with hypocalciuria
- Blood magnesium below reference range
- Blood magnesium outside reference range
- Drug-induced hypomagnesemia
- EGF-related primary hypomagnesemia with intellectual disability
- Familial hypomagnesemia hypercalciuria nephrocalcinosis with severe ocular involvement
- Familial hypomagnesemia-hypercalciuria
- Familial primary hypomagnesemia with hypercalciuria and nephrocalcinosis
- 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
- Parathyroid hypocalcemic tetany
- Primary hypomagnesemia
- Primary hypomagnesemia, generalized seizures, intellectual disability, obesity syndrome
- Primary hypomagnesemia, refractory seizures, intellectual disability syndrome
- Secondary hypomagnesemia
- Tetany
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E83.42: its own notes plus those printed at E83, block E70-E88, and Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- Ehlers-Danlos syndromes (Q79.6-)
Notes
General instructions on how these codes are used.
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name E83.42, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming E83.42: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
Hypomagnesemia E83.42
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Hypomagnesemia, CTCAE
a disorder characterized by laboratory test results that indicate a low concentration of magnesium in the blood.
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 E83.42 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E83.42Overview
What is the ICD-10 code for hypomagnesemia?
The ICD-10-CM code for hypomagnesemia is E83.42 (sometimes written as E8342). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E83.42 (Disorders of magnesium metabolism) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report hypomagnesemia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E83.42 group to?
When hypomagnesemia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 641, 640, with relative weights from 0.7864 to 1.3392 depending on complications. Higher weights mean higher Medicare reimbursement.
Can E83.42 be reported with a code from E55?
Not as a rule. The Excludes1 note at E83, which applies to E83.42, lists "vitamin D deficiency (E55.-)". 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).
What is the ICD-9 equivalent of E83.42?
Under the General Equivalence Mappings, hypomagnesemia converts to ICD-9-CM 275.2 (dis magnesium metabolism). The mapping is approximate, so confirm the match fits the documentation.
