5B54

ICD-11 MMS 2026-01

Underweight in adults

Description

Body mass index (BMI) <18.5 kg/m²

Index terms

  • Underweight in adults
  • Thinness in adults
  • Mild thinness in adults
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  • Moderate thinness in adults
  • Severe thinness in adults
  • marasmus in adults

Exclusions from above levels

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  • NF07.0 – starvation
  • 18 – Pregnancy, childbirth or the puerperium
  • http://id.who.int/icd/entity/1004987305 – Transitory endocrine or metabolic disorders specific to fetus or newborn

Sibling codes

  • 5B50 – Underweight in infants, children or adolescents
  • 5B51 – Wasting in infants, children or adolescents
  • 5B52 – Acute malnutrition in infants, children or adolescents
  • 5B53 – Stunting in infants, children or adolescents
  • 5B55 – Vitamin A deficiency
  • 5B56 – Vitamin C deficiency
  • 5B57 – Vitamin D deficiency
  • 5B58 – Vitamin E deficiency
  • 5B59 – Vitamin K deficiency
  • 5B5A – Vitamin B1 deficiency
  • 5B5B – Vitamin B2 deficiency
  • 5B5C – Vitamin B3 deficiency
  • 5B5D – Vitamin B6 deficiency
  • 5B5E – Folate deficiency
  • 5B5F – Vitamin B12 deficiency
  • 5B5G – Biotin deficiency
  • 5B5H – Pantothenic acid deficiency
  • 5B5J – Choline deficiency
  • 5B5K – Mineral deficiencies
  • 5B70 – Essential fatty acid deficiency
  • 5B71 – Protein deficiency
  • 5B7Y – Other specified undernutrition
  • 5B7Z – Unspecified undernutrition

Foundation entity

Underweight in adults – http://id.who.int/icd/entity/1153296343

Allowed postcoordination axes

Part of: 05: Endocrine, nutritional or metabolic diseases