DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K66 Other disorders of peritoneum

  • Header · not billable

K66 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Hemoperitoneum → K66.1
  • Adhesions, adhesive (postinfective) → K66.0
  • Granulomaabdomen → K66.8

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K65-K6A Diseases of peritoneum, retroperitoneum and pelvis (K65-K6A)
  3. K66 Other disorders of peritoneum
Billable codes
4
Subdivisions
4
CC / MCC codes
0 / 1
HCC V28 codes
0
New FY2027
0
Index entries
21

Codes in K66

  1. K66.0
    Peritoneal adhesions (postprocedural) (postinfection)
    Billable
    Inclusion terms 8, Excludes1 1, Excludes2 2

    Inclusion terms

    • Adhesions (of) abdominal (wall)
    • Adhesions (of) diaphragm
    • Adhesions (of) intestine
    • Adhesions (of) male pelvis
    • Adhesions (of) omentum
    • Adhesions (of) stomach
    • Adhesive bands
    • Mesenteric adhesions

    Excludes1

    • peritoneal adhesions with intestinal obstruction (K56.5-) K56.5

    Excludes2

    • female pelvic adhesions [bands] (N73.6) N73.6
    • female pelvic postprocedural adhesions (N99.4) N99.4
  2. K66.1
    Hemoperitoneum
    BillableMCC
    Inclusion terms 2, Excludes1 1, Excludes2 2

    Inclusion terms

    • Peritoneal hematoma
    • Peritoneal hemorrhage

    Excludes1

    • traumatic hemoperitoneum (S36.8-) S36.8

    Excludes2

    • retroperitoneal hematoma (K68.3) K68.3
    • retroperitoneal hemorrhage (K68.3) K68.3
  3. K66.8
    Other specified disorders of peritoneum
    Billable
  4. K66.9
    Disorder of peritoneum, unspecified
    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 K66

Excludes2

  • ascites (R18.-) R18
  • peritoneal effusion (chronic) (R18.8) R18.8

Notes that also apply

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

Index entries

  • Adhesions, adhesive (postinfective) → K66.0
  • Hemoperitoneum → K66.1
  • Adhesions, adhesive (postinfective)peritoneum, peritoneal (postinfective) → K66.0
  • Adhesions, adhesive (postinfective)postoperative (gastrointestinal tract) → K66.0
  • Hematoma (traumatic) (skin surface intact)peritoneal → K66.1
  • Hemorrhage, hemorrhagic (concealed)intraperitoneal → K66.1
  • Hemorrhage, hemorrhagic (concealed)mesentery → K66.1
  • Hemorrhage, hemorrhagic (concealed)omentum → K66.1
  • Hemorrhage, hemorrhagic (concealed)peritoneum, peritoneal → K66.1
  • Cyst (colloid) (mucous) (simple) (retention)mesentery, mesenteric → K66.8
  • Cyst (colloid) (mucous) (simple) (retention)omentum (lesser) → K66.8
  • Cyst (colloid) (mucous) (simple) (retention)peritoneum → K66.8
  • Granulomaabdomen → K66.8
  • Granulomaperitoneum → K66.8
  • Pneumatosisperitonei → K66.8
  • Rupture, rupturedmesentery (nontraumatic) → K66.8
  • Disease, diseasedperitoneum → K66.9
  • Adhesions, adhesive (postinfective)peritoneum, peritoneal (postinfective)postprocedural → K66.0
  • Hemorrhage, hemorrhagic (concealed)intrapelvicmale → K66.1
  • Disease, diseasedperitoneumspecified NEC → K66.8
  • Frozenpelvis (female)male → K66.8

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

Hierarchy