DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A08 Viral and other specified intestinal infections

  • Header · not billable

A08 is not billable. The category heads 9 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A00-A09 Intestinal infectious diseases (A00-A09)
  3. A08 Viral and other specified intestinal infections
Billable codes
9
Subdivisions
6
CC / MCC codes
7 / 0
HCC V28 codes
0
New FY2027
0
Index entries
54

Codes in A08

  1. A08.0
    Rotaviral enteritis
    BillableCC
  2. A08.1
    Acute gastroenteropathy due to Norwalk agent and other small round viruses
    Header
  3. A08.11
    Acute gastroenteropathy due to Norwalk agent
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Acute gastroenteropathy due to Norovirus
    • Acute gastroenteropathy due to Norwalk-like agent
  4. A08.19
    Acute gastroenteropathy due to other small round viruses
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Acute gastroenteropathy due to small round virus [SRV] NOS
  5. A08.2
    Adenoviral enteritis
    BillableCC
  6. A08.3
    Other viral enteritis
    Header
  7. A08.31
    Calicivirus enteritis
    BillableCC
  8. A08.32
    Astrovirus enteritis
    BillableCC
  9. A08.39
    Other viral enteritis
    BillableCC
    Inclusion terms 4

    Inclusion terms

    • Coxsackie virus enteritis
    • Echovirus enteritis
    • Enterovirus enteritis NEC
    • Torovirus enteritis
  10. A08.4
    Viral intestinal infection, unspecified
    Billable
    Inclusion terms 3

    Inclusion terms

    • Viral enteritis NOS
    • Viral gastroenteritis NOS
    • Viral gastroenteropathy NOS
  11. A08.8
    Other specified intestinal infections
    Billable

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 A08

Excludes1

  • influenza with involvement of gastrointestinal tract (J09.X3, J10.2, J11.2) J09.X3 J10.2 J11.2

Notes that also apply

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

Index entries

  • Bradley's disease → A08.19
  • Goodall's disease → A08.19
  • Spencer's disease → A08.19
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)rotaviral → A08.0
  • Gastroenteritis (acute) (chronic) (noninfectious)rotaviral → A08.0
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)norovirus → A08.11
  • Gastroenteropathyacute, due to Norwalk agent → A08.11
  • Gastroenteropathyacute, due to Norovirus → A08.11
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)small round structured NEC → A08.19
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)adenovirus → A08.2
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)calicivirus → A08.31
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)astrovirus → A08.32
  • Coxsackie (virus) (infection)enteritis → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)coxsackie virus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)echovirus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)enterovirus NEC → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)torovirus → A08.39
  • Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)viral → A08.4
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viral → A08.4
  • Fluintestinal NEC → A08.4
  • Gastritis (simple)viral NEC → A08.4
  • Gastroduodenitisvirus, viral → A08.4
  • Gastroenteritis (acute) (chronic) (noninfectious)viral NEC → A08.4
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viralRotavirus → A08.0
  • Gastroenteritis (acute) (chronic) (noninfectious)viral NECrotaviral → A08.0
  • Gastroenteritis (acute) (chronic) (noninfectious)viral NECNorwalk agent → A08.11
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viralsmall round structured NEC → A08.19
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viraladenovirus → A08.2
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due tocalicivirus → A08.31
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due toastrovirus → A08.32
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory)specifiedvirus NEC → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due tocoxsackie virus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due toechovirus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due toenterovirus NEC → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)due totorovirus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viralenterovirus → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viralspecified NEC → A08.39
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)viralvirus specified NEC → A08.39
  • Gastroduodenitisvirus, viralspecified type NEC → A08.39
  • Gastroenteritis (acute) (chronic) (noninfectious)viral NECacute infectious → A08.39

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

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