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K31.A0 ICD-10-CM Code: Gastric intestinal metaplasia, unspecified

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 391 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITH MCC (MDC 06)
  • MS-DRG 392 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITHOUT MCC (MDC 06)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Gastric intestinal metaplasia, unspecified is a billable ICD-10-CM diagnosis code (K31.A0).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for K31.A0 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • functional disorders of stomach

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Gastric intestinal metaplasia indefinite for dysplasia
  • Gastric intestinal metaplasia NOS

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Indexed Clinical Terms (2)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Metaplasia, gastric intestinal
  • Metaplasia, gastric intestinal, indefinite for dysplasia

Frequently Compared Codes

The official Excludes notes on K31.A0 name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • FY2022 — 2021-10-01
    Added to the code set
    Gastric intestinal metaplasia, unspecified
    FY2022 changes

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Relationships & Classification

Official ICD-10-CM tabular notes on other codes that name K31.A0 or its code family.

1 Excludes2 notes: K59 (via K31.-).

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 391 (MDC 06), DRG 392 (MDC 06).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):DIG008 — Other specified and unspecified disorders of stomach and duodenum (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Contextual Map

Every relationship of K31.A0 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • K00-K95 — Chapter 11: Diseases of the Digestive System (K00-K95) (K00-K95) [Hierarchy]
  • K20-K31 — Diseases of esophagus, stomach and duodenum [Hierarchy]

Referenced by Excludes2 notes

  • K59 — Other functional intestinal disorders [Excludes2](via K31.-): “functional disorders of stomach (K31.-)” · check together

Clinical classification (CCSR)

  • DIG008 — Other specified and unspecified disorders of stomach and duodenum [CCSR]

Potential MS-DRG

  • DRG 391 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITH MCC [MS-DRG]: “ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITH MCC (MDC 06)”
  • DRG 392 — ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITHOUT MCC [MS-DRG]: “ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITHOUT MCC (MDC 06)”

MDC crossing · procedures (5744)

  • MDC 06 — Diseases and Disorders of the Digestive System [MDC crossing]: “Diseases and Disorders of the Digestive System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 008Q0ZZ — Division of Vagus Nerve, Open Approach [Same-MDC procedure]: “Division of Vagus Nerve, Open Approach — grouped in MDC 06, the procedure side of this code's crossing.” · check together
  • 008Q3ZZ — Division of Vagus Nerve, Percutaneous Approach [Same-MDC procedure]: “Division of Vagus Nerve, Percutaneous Approach — grouped in MDC 06, the procedure side of this code's crossing.” · check together
  • 008Q4ZZ — Division of Vagus Nerve, Percutaneous Endoscopic Approach [Same-MDC procedure]: “Division of Vagus Nerve, Percutaneous Endoscopic Approach — grouped in MDC 06, the procedure side of this code's crossing.” · check together
  • 02BP3ZZ — Excision of Pulmonary Trunk, Percutaneous Approach [Same-MDC procedure]: “Excision of Pulmonary Trunk, Percutaneous Approach — grouped in MDC 06, the procedure side of this code's crossing.” · check together
  • 02BQ3ZZ — Excision of Right Pulmonary Artery, Percutaneous Approach [Same-MDC procedure]: “Excision of Right Pulmonary Artery, Percutaneous Approach — grouped in MDC 06, the procedure side of this code's crossing.” · check together
  • and 5739 more

Index entries

  • Metaplasia, gastric intestinal[Index term]
  • Metaplasia, gastric intestinal, indefinite for dysplasia[Index term]

Nearest codes (31)

  • K31 — Other diseases of stomach and duodenum [Sibling]
  • K31.0 — Acute dilatation of stomach [Sibling]
  • K31.1 — Adult hypertrophic pyloric stenosis [Sibling]
  • K31.2 — Hourglass stricture and stenosis of stomach [Sibling]
  • K31.3 — Pylorospasm, not elsewhere classified [Sibling]
  • K31.4 — Gastric diverticulum [Sibling]
  • K31.5 — Obstruction of duodenum [Sibling]
  • K31.6 — Fistula of stomach and duodenum [Sibling]
  • and 23 more

Change history

  • FY2022 — Added to the code set [Change history]

Nearest Codes in This Family

Official ICD-10-CM classifications closest to K31.A0 in its code family, with their registry titles.

  • K31.83 — Achlorhydria
  • 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.A1 — Gastric intestinal metaplasia without dysplasia
  • K31.A11 — Gastric intestinal metaplasia without dysplasia, involving the antrum
  • K31.A12 — Gastric intestinal metaplasia without dysplasia, involving the body (corpus)
  • K31.A13 — Gastric intestinal metaplasia without dysplasia, involving the fundus
  • K31.A14 — Gastric intestinal metaplasia without dysplasia, involving the cardia

View all codes in the K31 family