K31.83 Achlorhydria

Billable ICD-10-CM code, FY2026.

Applies from K31 Other diseases of stomach and duodenum

Includes

• functional disorders of stomach

Excludes2 (not included here)

• diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
• diverticulum of duodenum (K57.00-K57.13)

MS-DRG index

Defines the logic of DRG(s) 391-392 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 536.0 Achlorhydria

Code annotations containing back-references to K31.83

Back-references to K31

• Type 2 Excludes: K59 Other functional intestinal disorders ("functional disorders of stomach (K31.-)")

Diagnosis Index entries for K31.83

• Achlorhydria, achlorhydric (neurogenic)
• Achlorhydria, achlorhydric (neurogenic) › diarrhea
• Anacidity, gastric
• Diarrhea, diarrheal (disease) (infantile) (inflammatory) › achlorhydric

Nearby codes

• K31.8 Other specified diseases of stomach and duodenum
• K31.81 Angiodysplasia of stomach and duodenum
• K31.811 Angiodysplasia of stomach and duodenum with bleeding
• K31.819 Angiodysplasia of stomach and duodenum without bleeding
• K31.82 Dieulafoy lesion (hemorrhagic) of stomach and duodenum
• K31.83 Achlorhydria (this code)
• K31.84 Gastroparesis
• K31.89 Other diseases of stomach and duodenum
• K31.9 Disease of stomach and duodenum, unspecified
• K31.A Gastric intestinal metaplasia
• K31.A0 Gastric intestinal metaplasia, unspecified