2024 ICD-10-CM Diagnosis Code K31.9

Disease of stomach and duodenum, unspecified

ICD-10-CM Code:
K31.9
ICD-10 Code for:
Disease of stomach and duodenum, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the digestive system
    (K00–K95)
    • Diseases of esophagus, stomach and duodenum
      (K20-K31)
      • Other diseases of stomach and duodenum
        (K31)

K31.9 is a billable diagnosis code used to specify a medical diagnosis of disease of stomach and duodenum, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like K31.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Disorder of duodenum
  • Disorder of stomach
  • Erosive duodenopathy
  • Erosive gastropathy
  • Functional disorder of gastrointestinal tract
  • Functional disorder of stomach
  • Gastric dysplasia
  • Gastric mucosal lesion
  • Gastritis medicamentosa
  • Gastroduodenal disorder
  • Hypertrophic gastropathy
  • Lesion of stomach
  • Mild stomach dysplasia
  • Moderate stomach dysplasia
  • NSAID-associated gastropathy
  • Papulous gastropathy
  • Reactive gastropathy
  • Severe stomach dysplasia
  • Stomach problem

Clinical Classification

Clinical Information

  • Gastric Dysplasia

    a morphologic finding indicating the presence of dysplastic changes within the gastric mucosal epithelial cells.
  • Indefinite for Gastric Dysplasia|Indefinite for Gastric Intraepithelial Neoplasia

    a term used to describe an ambiguous morphologic pattern in the gastric mucosa, when there is doubt whether the findings represent a non-neoplastic or neoplastic pathologic process.
  • Negative for Gastric Dysplasia|Negative for Gastric Intraepithelial Neoplasia

    a morphologic finding indicating the absence of dysplastic changes in the gastric mucosal epithelium. it includes non-neoplastic inflammatory, reactive, or metaplastic pathologic processes.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert K31.9 to ICD-9-CM

  • ICD-9-CM Code: 536.9 - Stomach function dis NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.
  • ICD-9-CM Code: 537.9 - Gastroduodenal dis NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


Stomach Disorders

Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.

Most people have a problem with their stomach at one time or another. Indigestion and heartburn are common problems. You can relieve some stomach problems with over-the-counter medicines and lifestyle changes, such as avoiding fatty foods or eating more slowly. Other problems like peptic ulcers or GERD require medical attention.

You should see a doctor if you have any of the following:

  • Blood when you have a bowel movement
  • Severe abdominal pain
  • Heartburn not relieved by antacids
  • Unintended weight loss
  • Ongoing vomiting or diarrhea

NIH: National Institute of Diabetes and Digestive and Kidney Diseases


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.