DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K81 Cholecystitis

  • Header · not billable

K81 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Cholecystitis → K81.9
  • Gallbladderacute → K81.0
  • Cholecystitischronic → K81.1

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K80-K87 Disorders of gallbladder, biliary tract and pancreas (K80-K87)
  3. K81 Cholecystitis
Billable codes
4
Subdivisions
4
CC / MCC codes
2 / 0
HCC V28 codes
0
New FY2027
0
Index entries
11

Codes in K81

  1. K81.0
    Acute cholecystitis
    BillableCC
    Inclusion terms 7

    Inclusion terms

    • Abscess of gallbladder
    • Angiocholecystitis
    • Emphysematous (acute) cholecystitis
    • Empyema of gallbladder
    • Gangrene of gallbladder
    • Gangrenous cholecystitis
    • Suppurative cholecystitis
  2. K81.1
    Chronic cholecystitis
    Billable
  3. K81.2
    Acute cholecystitis with chronic cholecystitis
    BillableCC
  4. K81.9
    Cholecystitis, 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 K81

Excludes1

  • cholecystitis with cholelithiasis (K80.-) K80

Use additional code

  • code if applicable for associated gangrene of gallbladder (K82.A1), or perforation of gallbladder (K82.A2) K82.A1 K82.A2

Notes that also apply

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

Index entries

  • Cholecystitis → K81.9
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)gallbladder → K81.0
  • Cholecystitisacute (emphysematous) (gangrenous) (suppurative) → K81.0
  • Empyema (acute) (chest) (double) (pleura) (supradiaphragmatic) (thorax)gallbladder → K81.0
  • Gallbladderacute → K81.0
  • Septicgallbladder (acute) → K81.0
  • Suppuration, suppurativegallbladder (acute) → K81.0
  • Cholecystitischronic → K81.1
  • Infection, infected, infective (opportunistic)cystic duct → K81.9
  • Cholecystitischronicwith acute cholecystitis → K81.2
  • Cholecystitisacute (emphysematous) (gangrenous) (suppurative)withchronic cholecystitis → K81.2

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

Hierarchy