DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K55 Vascular disorders of intestine

  • Header · not billable

K55 is not billable. The category heads 27 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

  • Wilkie's disease or syndrome → K55.1
  • Angiodysplasia (cecum) (colon) → K55.20
  • SyndromeWilkie's → K55.1

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K55-K64 Other diseases of intestines (K55-K64)
  3. K55 Vascular disorders of intestine
Billable codes
27
Subdivisions
6
CC / MCC codes
3 / 23
HCC V28 codes
0
New FY2027
0
Index entries
108

Codes in K55

  1. K55.0
    Acute vascular disorders of intestine
    Header
    Inclusion terms 4

    Inclusion terms

    • Infarction of appendices epiploicae
    • Mesenteric (artery) (vein) embolism
    • Mesenteric (artery) (vein) infarction
    • Mesenteric (artery) (vein) thrombosis
  2. K55.01
    Acute (reversible) ischemia of small intestine
    Header
  3. K55.011
    Focal (segmental) acute (reversible) ischemia of small intestine
    BillableMCC
  4. K55.012
    Diffuse acute (reversible) ischemia of small intestine
    BillableMCC
  5. K55.019
    Acute (reversible) ischemia of small intestine, extent unspecified
    BillableMCC
  6. K55.02
    Acute infarction of small intestine
    Header
    Inclusion terms 2

    Inclusion terms

    • Gangrene of small intestine
    • Necrosis of small intestine
  7. K55.021
    Focal (segmental) acute infarction of small intestine
    BillableMCC
  8. K55.022
    Diffuse acute infarction of small intestine
    BillableMCC
  9. K55.029
    Acute infarction of small intestine, extent unspecified
    BillableMCC
  10. K55.03
    Acute (reversible) ischemia of large intestine
    Header
    Inclusion terms 2

    Inclusion terms

    • Acute fulminant ischemic colitis
    • Subacute ischemic colitis
  11. K55.031
    Focal (segmental) acute (reversible) ischemia of large intestine
    BillableMCC
  12. K55.032
    Diffuse acute (reversible) ischemia of large intestine
    BillableMCC
  13. K55.039
    Acute (reversible) ischemia of large intestine, extent unspecified
    BillableMCC
  14. K55.04
    Acute infarction of large intestine
    Header
    Inclusion terms 2

    Inclusion terms

    • Gangrene of large intestine
    • Necrosis of large intestine
  15. K55.041
    Focal (segmental) acute infarction of large intestine
    BillableMCC
  16. K55.042
    Diffuse acute infarction of large intestine
    BillableMCC
  17. K55.049
    Acute infarction of large intestine, extent unspecified
    BillableMCC
  18. K55.05
    Acute (reversible) ischemia of intestine, part unspecified
    Header
  19. K55.051
    Focal (segmental) acute (reversible) ischemia of intestine, part unspecified
    BillableMCC
  20. K55.052
    Diffuse acute (reversible) ischemia of intestine, part unspecified
    BillableMCC
  21. K55.059
    Acute (reversible) ischemia of intestine, part and extent unspecified
    BillableMCC
  22. K55.06
    Acute infarction of intestine, part unspecified
    Header
    Inclusion terms 3

    Inclusion terms

    • Acute intestinal infarction
    • Gangrene of intestine
    • Necrosis of intestine
  23. K55.061
    Focal (segmental) acute infarction of intestine, part unspecified
    BillableMCC
  24. K55.062
    Diffuse acute infarction of intestine, part unspecified
    BillableMCC
  25. K55.069
    Acute infarction of intestine, part and extent unspecified
    BillableMCC
  26. K55.1
    Chronic vascular disorders of intestine
    BillableCC
    Inclusion terms 6

    Inclusion terms

    • Chronic ischemic colitis
    • Chronic ischemic enteritis
    • Chronic ischemic enterocolitis
    • Ischemic stricture of intestine
    • Mesenteric atherosclerosis
    • Mesenteric vascular insufficiency
  27. K55.2
    Angiodysplasia of colon
    Header
  28. K55.20
    Angiodysplasia of colon without hemorrhage
    Billable
  29. K55.21
    Angiodysplasia of colon with hemorrhage
    BillableMCC
  30. K55.3
    Necrotizing enterocolitis
    Header
    Excludes1 1, Excludes2 1

    Excludes1

    • necrotizing enterocolitis of newborn (P77.-) P77

    Excludes2

    • necrotizing enterocolitis due to Clostridium difficile (A04.7-) A04.7
  31. K55.30
    Necrotizing enterocolitis, unspecified
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Necrotizing enterocolitis, NOS
  32. K55.31
    Stage 1 necrotizing enterocolitis
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Necrotizing enterocolitis without pneumatosis, without perforation
  33. K55.32
    Stage 2 necrotizing enterocolitis
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Necrotizing enterocolitis with pneumatosis, without perforation
  34. K55.33
    Stage 3 necrotizing enterocolitis
    BillableMCC
    Inclusion terms 2

    Inclusion terms

    • Necrotizing enterocolitis with perforation
    • Necrotizing enterocolitis with pneumatosis and perforation
  35. K55.8
    Other vascular disorders of intestine
    BillableCC
  36. K55.9
    Vascular disorder of intestine, unspecified
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Ischemic colitis
    • Ischemic enteritis
    • Ischemic enterocolitis

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 K55

Excludes1

  • necrotizing enterocolitis of newborn (P77.-) P77

Excludes2

  • angioectasia (angiodysplasia) duodenum (K31.81-) K31.81

Notes that also apply

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

Index entries

  • Wilkie's disease or syndrome → K55.1
  • Angiodysplasia (cecum) (colon) → K55.20
  • Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective)fulminant → K55.019
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)subacute ischemic → K55.039
  • Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic)thromboulcerative → K55.039
  • Disease, diseasedmesenteric embolic → K55.039
  • Embolism (multiple) (paradoxical)intestine (artery) (vein) (with gangrene) → K55.039
  • Infarct, infarctioncolon (acute) (agnogenic) (embolic) (hemorrhagic) (nonocclusive) (nonthrombotic) (occlusive) (segmental) (thrombotic) (with gangrene) → K55.049
  • Necrosis, necrotic (ischemic)colon → K55.049
  • Embolism (multiple) (paradoxical)mesenteric (artery) (vein) (with gangrene) → K55.059
  • Enterocolitisfulminant ischemic → K55.059
  • Enterocolitishemorrhagic (acute) → K55.059
  • Enteropathyhemorrhagic, terminal → K55.059
  • Ischemia, ischemicmesenteric, acute → K55.059
  • Narrowingmesenteric artery → K55.059
  • Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)intestine, intestinal (hemorrhagic) (massive) → K55.069
  • Gangrene, gangrenous (connective tissue) (dropsical) (dry) (moist) (skin) (ulcer)mesentery → K55.069
  • Infarct, infarctionappendices epiploicae → K55.069
  • Infarct, infarctionbowel → K55.069
  • Infarct, infarctionintestine (acute) (agnogenic) (embolic) (hemorrhagic) (nonocclusive) (nonthrombotic) (occlusive) (thrombotic) (with gangrene) → K55.069
  • Infarct, infarctionmesentery, mesenteric (embolic) (thrombotic) (with gangrene) → K55.069
  • Infarct, infarctionomentum → K55.069
  • Necrosis, necrotic (ischemic)intestine (acute) (hemorrhagic) (massive) → K55.069
  • Necrosis, necrotic (ischemic)mesentery → K55.069
  • Necrosis, necrotic (ischemic)omentum (with mesenteric infarction) → K55.069
  • Necrosis, necrotic (ischemic)peritoneum (with mesenteric infarction) → K55.069
  • Occlusion, occludedmesenteric artery (embolic) (thrombotic) → K55.069
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)intestine (with gangrene) → K55.069
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)mesenteric (artery) (with gangrene) → K55.069
  • Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel)omentum (with gangrene) → K55.069
  • Abdomen, abdominalangina → K55.1
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)abdominal → K55.1
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)intestinal → K55.1
  • Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)mesenteric → K55.1
  • Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification)mesenteric (artery) → K55.1
  • Disease, diseasedWilkie's → K55.1
  • Insufficiency, insufficientmesenteric → K55.1
  • Ischemia, ischemiccolon chronic (due to mesenteric artery insufficiency) → K55.1
  • SyndromeWilkie's → K55.1
  • Angiodysplasia (cecum) (colon)with bleeding → K55.21

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

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy