ICD-10-CM 2027
ICD-10 code for Achlorhydria
From the official ICD-10-CM alphabetic index entry “Achlorhydria, achlorhydric (neurogenic)”. Page updated September 29, 2026.
About coding Achlorhydria
The ICD-10-CM code for Achlorhydria is K31.83 (Achlorhydria). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on K31.83.
Within K31.8 (other specified diseases of stomach and duodenum), K31.83 is specifically for Achlorhydria. Related codes cover Angiodysplasia of stomach and duodenum (K31.81), Dieulafoy lesion (hemorrhagic) of stomach and duodenum (K31.82), Gastroparesis (K31.84) and other diseases of stomach and duodenum (K31.89).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Achlorhydria codes (official index)
Common questions about Achlorhydria ICD-10 codes
What is the ICD-10 code for Achlorhydria?
- K31.83 — Achlorhydria. More specific codes apply when the documentation supports them: D50.8, K31.83, F45.8, K91.1.
What is the ICD-10 code for anemia achlorhydria?
- D50.8 — Other iron deficiency anemias.
What is the ICD-10 code for diarrhea achlorhydria?
- K31.83 — Achlorhydria.
What is the ICD-10 code for psychogenic achlorhydria?
- F45.8 — Other somatoform disorders.
What is the ICD-10 code for secondary to vagotomy achlorhydria?
- K91.1 — Postgastric surgery syndromes.
Is K31.83 billable?
- Yes. K31.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K31.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K31.83 as a principal diagnosis.
Is K31.83 a CC or MCC?
- No. K31.83 is neither a CC nor an MCC under MS-DRG v44.0.