DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 11

K20-K31 Diseases of esophagus, stomach and duodenum (K20-K31)

Block K20-K31 groups 11 categories with 106 billable codes in FY2027. One code is new this year.

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K20-K31 Diseases of esophagus, stomach and duodenum (K20-K31)

Neighbouring blocks

Categories
11
Billable codes
106
CC codes
10
MCC codes
41
HCC V28 codes
16
New FY2027
1

Categories in K20-K31

  • K20

    Esophagitis

    Esophagitis (acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding) → K20.90

    • 5 billable codes
    • 2 MCC
  • K21

    Gastro-esophageal reflux disease

    Reflux → K21.9

    • 3 billable codes
    • 1 MCC
  • K22

    Other diseases of esophagus

    Esophagismus → K22.4

    • 16 billable codes
    • 1 CC
    • 3 MCC
  • K23

    Disorders of esophagus in diseases classified elsewhere

    –

    • Billable, no subdivisions
  • K25

    Gastric ulcer

    Ulcer, ulcerated, ulcerating, ulceration, ulcerativeDieulafoy's → K25.0

    • 9 billable codes
    • 1 CC
    • 6 MCC
    • 4 with HCC
  • K26

    Duodenal ulcer

    Ulcer, ulcerated, ulcerating, ulceration, ulcerativeduodenum, duodenal (eroded) (peptic) → K26.9

    • 9 billable codes
    • 1 CC
    • 6 MCC
    • 4 with HCC
  • K27

    Peptic ulcer, site unspecified

    Lesion(s) (nontraumatic)peptic → K27.9

    • 9 billable codes
    • 1 CC
    • 6 MCC
    • 4 with HCC
  • K28

    Gastrojejunal ulcer

    Ulcer, ulcerated, ulcerating, ulceration, ulcerativegastrojejunal (peptic) → K28.9

    • 9 billable codes
    • 1 CC
    • 6 MCC
    • 4 with HCC
  • K29

    Gastritis and duodenitis

    Pyloritis → K29.90

    • 18 billable codes
    • 9 MCC
  • K30

    Functional dyspepsia

    Apepsia → K30

    • Billable, no subdivisions
  • K31

    Other diseases of stomach and duodenum

    Gastroliths → K31.89

    • 26 billable codes
    • 5 CC
    • 2 MCC
    • 1 new

FY2027 changes in K20-K31

  • K31.B Hypertrophic pyloric stenosis, in childhood New FY2027

Index main terms

  • Ulcer, ulcerated, ulcerating, ulceration, ulcerative → K21, K22, K25, K26, K27, K28 (71 entries)
  • Gastritis (simple) → K29 (28 entries)
  • Disease, diseased → K21, K22, K30, K31 (13 entries)
  • Metaplasia → K22, K31 (12 entries)
  • Esophagitis (acute) (alkaline) (chemical) (chronic) (infectional) (necrotic) (peptic) (postoperative) (without bleeding) → K20, K21, K22 (11 entries)
  • Fistula (cutaneous) → K22, K31 (10 entries)
  • Stricture → K22, K31 (10 entries)
  • Diverticulum, diverticula (multiple) → K22, K31 (9 entries)
  • Stenosis, stenotic (cicatricial) → K22, K31 (9 entries)
  • Syndrome → K22, K31 (9 entries)
  • Barrett's → K22 (8 entries)
  • Obstruction, obstructed, obstructive → K22, K31 (8 entries)
  • Reflux → K21 (8 entries)
  • Lesion(s) (nontraumatic) → K27, K31 (7 entries)
  • Deformity → K22, K31 (6 entries)

+135 more main terms; the search box finds them by word.

Block instructions

Excludes2

  • hiatus hernia (K44.-) K44

Notes that also apply

Chapter 11 instructions (Excludes2 8): printed on the chapter 11 page.