DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K61 Abscess of anal and rectal regions

  • Header · not billable

K61 is not billable. The category heads 7 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

  • Furuncleanus → K61.0
  • Carbuncleanus → K61.0
  • Fistula (cutaneous)ischiorectal (fossa) → K61.39

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K55-K64 Other diseases of intestines (K55-K64)
  3. K61 Abscess of anal and rectal regions
Billable codes
7
Subdivisions
6
CC / MCC codes
4 / 0
HCC V28 codes
0
New FY2027
0
Index entries
19

Codes in K61

  1. K61.0
    Anal abscess
    BillableCC
    Inclusion terms 1, Excludes2 1

    Inclusion terms

    • Perianal abscess

    Excludes2

    • intrasphincteric abscess (K61.4) K61.4
  2. K61.1
    Rectal abscess
    BillableCC
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Perirectal abscess

    Excludes1

    • ischiorectal abscess (K61.39) K61.39
  3. K61.2
    Anorectal abscess
    BillableCC
  4. K61.3
    Ischiorectal abscess
    Header
  5. K61.31
    Horseshoe abscess
    Billable
  6. K61.39
    Other ischiorectal abscess
    Billable
    Inclusion terms 2

    Inclusion terms

    • Abscess of ischiorectal fossa
    • Ischiorectal abscess, NOS
  7. K61.4
    Intrasphincteric abscess
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Intersphincteric abscess
  8. K61.5
    Supralevator abscess
    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 K61

Includes

  • abscess of anal and rectal regions
  • cellulitis of anal and rectal regions

Notes that also apply

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

Index entries

  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)anus → K61.0
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)marginal, anus → K61.0
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)perianal → K61.0
  • Carbuncleanus → K61.0
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)anus → K61.0
  • Furuncleanus → K61.0
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)pararectal → K61.1
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)perirectal → K61.1
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)rectum → K61.1
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)perirectal → K61.1
  • Cellulitis (diffuse) (phlegmonous) (septic) (suppurative)rectum → K61.1
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)anorectal → K61.2
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)horseshoe → K61.31
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)ischiorectal (fossa) (specified NEC) → K61.39
  • Fistula (cutaneous)ischiorectal (fossa) → K61.39
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)intersphincteric → K61.4
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)intrasphincteric (anus) → K61.4
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)supralevator → K61.5
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)intestine, intestinal NECrectal → K61.1

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

Hierarchy