DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 1

A00-A09 Intestinal infectious diseases (A00-A09)

Block A00-A09 groups 10 categories with 79 billable codes in FY2027.

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A00-A09 Intestinal infectious diseases (A00-A09)

Neighbouring blocks

Categories
10
Billable codes
79
CC codes
61
MCC codes
6
HCC V28 codes
7
New FY2027
0

Categories in A00-A09

  • A00

    Cholera

    Eltor cholera → A00.1

    • 3 billable codes
    • 3 CC
  • A01

    Typhoid and paratyphoid fevers

    Typhomania → A01.00

    • 11 billable codes
    • 11 CC
    • 2 with HCC
  • A02

    Other salmonella infections

    Salmonellosis → A02.0

    • 11 billable codes
    • 7 CC
    • 3 MCC
    • 3 with HCC
  • A03

    Shigellosis

    Shigellosis → A03.9

    • 6 billable codes
    • 1 CC
  • A04

    Other bacterial intestinal infections

    Yersiniosisintestinal → A04.6

    • 11 billable codes
    • 11 CC
  • A05

    Other bacterial foodborne intoxications, not elsewhere classified

    Pig-bel → A05.2

    • 8 billable codes
    • 7 CC
  • A06

    Amebiasis

    Amebiasis → A06.9

    • 12 billable codes
    • 7 CC
    • 3 MCC
    • 1 with HCC
  • A07

    Other protozoal intestinal diseases

    Giardiasis → A07.1

    • 7 billable codes
    • 6 CC
    • 1 with HCC
  • A08

    Viral and other specified intestinal infections

    Bradley's disease → A08.19

    • 9 billable codes
    • 7 CC
  • A09

    Infectious gastroenteritis and colitis, unspecified

    Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) → A09

    • Billable, no subdivisions
    • 1 CC

Index main terms

  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) → A00, A01, A02, A03, A04, A05, A06, A07, A08, A09 (85 entries)
  • Infection, infected, infective (opportunistic) → A00, A01, A02, A03, A04, A05, A07, A08 (81 entries)
  • Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) → A02, A03, A06, A07, A08, A09 (45 entries)
  • Diarrhea, diarrheal (disease) (infantile) (inflammatory) → A00, A03, A04, A06, A07, A08, A09 (41 entries)
  • Intoxication → A02, A05 (24 entries)
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) → A04, A05, A06, A07, A09 (20 entries)
  • Poisoning (acute) → A02, A05 (19 entries)
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) → A01, A06 (17 entries)
  • Typhoid (abortive) (ambulant) (any site) (clinical) (fever) (hemorrhagic) (infection) (intermittent) (malignant) (rheumatic) (Widal negative) → A01 (16 entries)
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) → A01, A02 (15 entries)
  • Gastroenteritis (acute) (chronic) (noninfectious) → A02, A07, A08, A09 (12 entries)
  • Amebiasis → A06 (11 entries)
  • Enterocolitis → A04, A09 (11 entries)
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) → A01, A02, A08, A09 (7 entries)
  • Cholera (Asiatic) (epidemic) (malignant) → A00 (7 entries)

+84 more main terms; the search box finds them by word.

Block instructions

Notes that also apply

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