2021 ICD-10-CM Diagnosis Code E73.9

Lactose intolerance, unspecified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • E73.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2021 edition of ICD-10-CM E73.9 became effective on October 1, 2020.
  • This is the American ICD-10-CM version of E73.9 - other international versions of ICD-10 E73.9 may differ.
The following code(s) above E73.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to E73.9:
  • E00-E89
    2021 ICD-10-CM Range E00-E89

    Endocrine, nutritional and metabolic diseases

    Note
    • 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.
    Type 1 Excludes
    • transitory endocrine and metabolic disorders specific to newborn (P70-P74)
    Endocrine, nutritional and metabolic diseases
  • E70-E88
    2021 ICD-10-CM Range E70-E88

    Metabolic disorders

    Type 1 Excludes
    • androgen insensitivity syndrome (E34.5-)
    • congenital adrenal hyperplasia (E25.0)
    • Ehlers-Danlos syndromes (Q79.6-)
    • hemolytic anemias attributable to enzyme disorders (D55.-)
    • Marfan's syndrome (Q87.4)
    • 5-alpha-reductase deficiency (E29.1)
    Metabolic disorders
Approximate Synonyms
  • Intestinal disaccharidase deficiency
  • Lactose intolerance
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.
ICD-10-CM E73.9 is grouped within Diagnostic Related Group(s) (MS-DRG v38.0):
  • 391 Esophagitis, gastroenteritis and miscellaneous digestive disorders with mcc
  • 392 Esophagitis, gastroenteritis and miscellaneous digestive disorders without mcc

Convert E73.9 to ICD-9-CM

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

Diagnosis Index entries containing back-references to E73.9:
  • Deficiency, deficient
    • disaccharidase E73.9
  • Intolerance
    • lactose E73.9
    • milk NEC K90.49
      ICD-10-CM Diagnosis Code K90.49

      Malabsorption due to intolerance, not elsewhere classified

        2017 - New Code 2018 2019 2020 2021 Billable/Specific Code
      Applicable To
      • Malabsorption due to intolerance to carbohydrate
      • Malabsorption due to intolerance to fat
      • Malabsorption due to intolerance to protein
      • Malabsorption due to intolerance to starch
      • lactose E73.9
  • Malabsorption K90.9
    ICD-10-CM Diagnosis Code K90.9

    Intestinal malabsorption, unspecified

      2016 2017 2018 2019 2020 2021 Billable/Specific Code
    • disaccharide E73.9
    • lactose E73.9

ICD-10-CM Codes Adjacent To E73.9
E72.53 Primary hyperoxaluria
E72.59 Other disorders of glycine metabolism
E72.8 Other specified disorders of amino-acid metabolism
E72.81 Disorders of gamma aminobutyric acid metabolism
E72.89 Other specified disorders of amino-acid metabolism
E72.9 Disorder of amino-acid metabolism, unspecified
E73 Lactose intolerance
E73.0 Congenital lactase deficiency
E73.1 Secondary lactase deficiency
E73.8 Other lactose intolerance
E73.9 Lactose intolerance, unspecified
E74 Other disorders of carbohydrate metabolism
E74.0 Glycogen storage disease
E74.00 …… unspecified
E74.01 von Gierke disease
E74.02 Pompe disease
E74.03 Cori disease
E74.04 McArdle disease
E74.09 Other glycogen storage disease
E74.1 Disorders of fructose metabolism
E74.10 Disorder of fructose metabolism, unspecified

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.