ICD-10 Code E59 – Dietary selenium deficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E59 – Dietary selenium deficiency
What it is
E59 identifies a lack of selenium caused by inadequate dietary intake. Use it when documentation states dietary selenium deficiency or selenium depletion from poor nutrition.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include nonspecific weakness or signs of poor nutrition, but diagnosis should be supported by the clinician’s assessment.
When to use this code
Use E59 when the record clearly documents dietary selenium deficiency as the reason for the encounter or as an active problem. It may also apply when a clinician links symptoms or malnutrition to low selenium intake. If the note only says “low selenium” without a dietary cause, check documentation.
Do not use for
Do not use this code for selenium toxicity, abnormal laboratory results alone, or deficiency from non-dietary causes unless the provider specifies dietary deficiency. Check documentation when the cause is unclear.
Coding tip
Code E59 only when the provider documents a nutritional cause; otherwise, query for clarification.