DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A04 Other bacterial intestinal infections

  • Header · not billable

A04 is not billable. The category heads 11 billable codes in FY2027, grouped under 10 subdivisions.

Index → code

  • Yersiniosisintestinal → A04.6
  • Pseudotuberculosisenterocolitis → A04.8
  • Infection, infected, infective (opportunistic)Helicobacter pylori → A04.8

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A00-A09 Intestinal infectious diseases (A00-A09)
  3. A04 Other bacterial intestinal infections
Billable codes
11
Subdivisions
10
CC / MCC codes
11 / 0
HCC V28 codes
0
New FY2027
0
Index entries
89

Codes in A04

  1. A04.0
    Enteropathogenic Escherichia coli infection
    BillableCC
  2. A04.1
    Enterotoxigenic Escherichia coli infection
    BillableCC
  3. A04.2
    Enteroinvasive Escherichia coli infection
    BillableCC
  4. A04.3
    Enterohemorrhagic Escherichia coli infection
    BillableCC
  5. A04.4
    Other intestinal Escherichia coli infections
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Escherichia coli enteritis NOS
  6. A04.5
    Campylobacter enteritis
    BillableCC
  7. A04.6
    Enteritis due to Yersinia enterocolitica
    BillableCC
    Excludes1 1

    Excludes1

    • extraintestinal yersiniosis (A28.2) A28.2
  8. A04.7
    Enterocolitis due to Clostridium difficile
    Header
    Inclusion terms 3

    Inclusion terms

    • Clostridioides difficile colitis
    • Foodborne intoxication by Clostridium difficile
    • Pseudomembraneous colitis
  9. A04.71
    Enterocolitis due to Clostridium difficile, recurrent
    BillableCC
  10. A04.72
    Enterocolitis due to Clostridium difficile, not specified as recurrent
    BillableCC
  11. A04.8
    Other specified bacterial intestinal infections
    BillableCC
  12. A04.9
    Bacterial intestinal infection, unspecified
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Bacterial enteritis NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At A04

Excludes1

  • bacterial foodborne intoxications, NEC (A05.-) A05
  • tuberculous enteritis (A18.32) A18.32

Notes that also apply

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.

Index entries

  • Infection, infected, infective (opportunistic)Campylobacter, intestinal → A04.5
  • Yersiniosisintestinal → A04.6
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)staphylococcal → A04.8
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)staphylococcal → A04.8
  • Infection, infected, infective (opportunistic)Helicobacter pylori → A04.8
  • Pseudotuberculosisenterocolitis → A04.8
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)bacterial → A04.9
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia coli → A04.4
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toCampylobacter → A04.5
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toYersinia enterocolitica → A04.6
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due toYersinia enterocolitica → A04.6
  • Infection, infected, infective (opportunistic)Yersiniaenterocolitica (intestinal) → A04.6
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)Clostridioides difficilerecurrent → A04.71
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)Clostridium difficilerecurrent → A04.71
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)pseudomembranousrecurrent → A04.71
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)Clostridioides difficilerecurrent → A04.71
  • Enterocolitispseudomembranous (newborn)recurrent → A04.71
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)Clostridioides difficilenot specified as recurrent → A04.72
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)Clostridium difficilenot specified as recurrent → A04.72
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)pseudomembranousnot specified as recurrent → A04.72
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)Clostridioides difficilenot specified as recurrent → A04.72
  • Enterocolitispseudomembranous (newborn)not specified as recurrent → A04.72
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toClostridium perfringens (C) (F) → A04.8
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toStaphylococcus → A04.8
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)specifiedbacterium NEC → A04.8
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)bacterialspecified NEC → A04.8
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due tobacteria → A04.9
  • Spondylitis (chronic)in (due to)enterobacteria → A04.9
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colienteropathogenic → A04.0
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colienterotoxigenic → A04.1
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colienteroinvasive → A04.2
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colienterohemorrhagic → A04.3
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colienteroaggregative → A04.4
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toEscherichia colispecified NEC → A04.4
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)infectious NOSdue toEscherichia coli → A04.4
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)infectious NOSdue toCampylobacter → A04.5
  • Arthropathypostinfectious NECin (due to)enteritis due to Yersinia enterocolitica → A04.6 [M12.80]
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)infectious NOSdue toYersinia enterocolitica → A04.6
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)due toClostridium difficilerecurrent → A04.71
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)Clostridiumdifficilerecurrent → A04.71

49 more, longer entries are not listed; the search box finds them by word.

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