K31.89 — Other diseases of stomach and duodenum
K31.89 is a billable, specific ICD-10-CM code for other diseases of stomach and duodenum. It is valid for submission on a claim.
Other codes that can never be billed with K31.89
These codes carry an Excludes1 note pointing at K31.89. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading K31.89 alone.
- K31.2Hourglass stricture and stenosis of stomach
Risk adjustment
K31.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
K31.89 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56389Billing and Coding: Upper Gastrointestinal Endoscopy and Visualization
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A57063Billing and Coding: Diagnostic and Therapeutic Esophagogastroduodenoscopy
- A57414Billing and Coding: Upper Gastrointestinal Endoscopy (Diagnostic and Therapeutic)
How K31.89 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K31.89.
- Achylia gastrica
- Fish hook stomach
- Gastroliths
- Gastromalacia
- Gastroptosis
- Gastrospasm(neurogenic) (reflex)
- Gastrostenosis
- Gastrosuccorrhea(continuous) (intermittent)
- Hyperacidity(gastric)
- Hyperchlorhydria
- Hypoacidity, gastric
- Hypochlorhydria
Related codes at this level
Codes that share K31.8. If K31.89 is not quite right, the correct code is usually one of these.
Questions about K31.89
- Is K31.89 a billable ICD-10-CM code?
- Yes. K31.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does K31.89 sit in the tabular list?
- Diseases of the digestive system (K00-K95), in the block Diseases of esophagus, stomach and duodenum (K20-K31).