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ICD-10-CM 2027 diagnosis code

K31.8Other specified diseases of stomach and duodenum

Not billable — use a more specific code

K31.8 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About K31.8

K31.8 is the ICD-10-CM diagnosis code for other specified diseases of stomach and duodenum. It belongs to category K31 (other diseases of stomach and duodenum), block K20-K31 (diseases of esophagus, stomach and duodenum) and chapter 11 (diseases of the digestive system). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within K31, choose K31.8 (Other specified diseases of stomach and duodenum) only when documentation doesn't support a more specific option: acute dilatation of stomach (K31.0), adult hypertrophic pyloric stenosis (K31.1), Hourglass stricture and stenosis of stomach (K31.2), Pylorospasm, not elsewhere classified (K31.3), gastric diverticulum (K31.4), obstruction of duodenum (K31.5), fistula of stomach and duodenum (K31.6), polyp of stomach and duodenum (K31.7) and 3 more.

To report this condition, pick the subcode that matches the documentation: K31.81 (duodenum), K31.82 (duodenum), K31.83 (Achlorhydria), K31.84 (Gastroparesis) and K31.89 (duodenum).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under K31.8

Notes that apply from higher levels

Instructions written at a parent level also apply to K31.8.

› From K31 Other diseases of stomach and duodenum
Includes
  • functional disorders of stomach
Excludes2

Broader instructions also apply from K20-K31 Diseases of esophagus, stomach and duodenum and Chapter 11: Diseases of the digestive system.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about K31.8

Is K31.8 billable?

No. K31.8 is a header code. Report one of its more specific subcodes instead.