2025 ICD-10-CM Diagnosis Code E73

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Lactose intolerance

  • E73 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2025 edition of ICD-10-CM E73 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of E73 – other international versions of ICD-10 E73 may differ.

The following code(s) above E73 contain annotation back-references

 that may be applicable to E73:

  • E00-E89  Endocrine, nutritional and metabolic diseases
  • E70-E88  Metabolic disorders

Clinical Information

  • Lactose intolerance means that you cannot digest foods with lactose in them. Lactose is the sugar found in milk and foods made with milk. After eating foods with lactose in them, you may feel sick to your stomach. You may also have
    • gas
    • diarrhea
    • swelling in your stomach
    your doctor may do a blood, breath or stool test to find out if your problems are due to lactose intolerance.lactose intolerance is not serious. Eating less food with lactose, or using pills or drops to help you digest lactose usually helps. You may need to take a calcium supplement if you don’t get enough of it from your diet, since milk and foods made with milk are the most common source of calcium for most people.
  • The condition resulting from the absence or deficiency of lactase in the mucosa cells of the gastrointestinal tract, and the inability to break down lactose in milk for absorption. Bacterial fermentation of the unabsorbed lactose leads to symptoms that range from a mild indigestion (dyspepsia) to severe diarrhea. Lactose intolerance may be an inborn error or acquired.
  • The inability to digest or absorb lactose, a type of sugar found in milk and other dairy products.

Code History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to E73:

  • Type 1 Excludes: Z91.011
  • Type 2 Excludes: K90.4, E74.3
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