E83.42 Hypomagnesemia

Billable ICD-10-CM code, FY2026.

Applies from E83 Disorders of mineral metabolism

Excludes1 (never code together)

• dietary mineral deficiency (E58-E61)
• parathyroid disorders (E20-E21)
• vitamin D deficiency (E55.-)

MS-DRG index

Defines the logic of DRG(s) 640-641 in MDC 10.

Approximate ICD-9-CM (GEMs)

• 275.2 Disorders of magnesium metabolism (approximate)

Code annotations containing back-references to E83.42

Back-references to E83

• Type 1 Excludes: E61 Deficiency of other nutrient elements ("disorders of mineral metabolism (E83.-)")
• Type 2 Excludes: G11 Hereditary ataxia ("metabolic disorders (E70-E88)")
• Code First: G63 Polyneuropathy in diseases classified elsewhere ("metabolic diseases (E70-E88)")
• Type 2 Excludes: G71 Primary disorders of muscles ("metabolic disorders (E70-E88)")
• Code First: H42 Glaucoma in diseases classified elsewhere ("specified metabolic disorder (E70-E88)")
• Type 2 Excludes: N25.0 Renal osteodystrophy ("metabolic disorders classifiable to E70-E88")
• Type 2 Excludes: N25.81 Secondary hyperparathyroidism of renal origin ("metabolic disorders classifiable to E70-E88")
• Type 1 Excludes: P59 Neonatal jaundice from other and unspecified causes ("jaundice due to inborn errors of metabolism (E70-E88)")
• Type 1 Excludes: R79.0 Abnormal level of blood mineral ("disorders of mineral metabolism (E83.-)")

Diagnosis Index entries for E83.42

• Disorder (of) › metabolism NOS › magnesium › hypomagnesemia
• Hypomagnesemia

Nearby codes

• E83.32 Hereditary vitamin D-dependent rickets (type 1) (type 2)
• E83.39 Other disorders of phosphorus metabolism
• E83.4 Disorders of magnesium metabolism
• E83.40 Disorders of magnesium metabolism, unspecified
• E83.41 Hypermagnesemia
• E83.42 Hypomagnesemia (this code)
• E83.49 Other disorders of magnesium metabolism
• E83.5 Disorders of calcium metabolism
• E83.50 Unspecified disorder of calcium metabolism
• E83.51 Hypocalcemia
• E83.52 Hypercalcemia