All ICD10 Codes

K59

Non-Billable
ChapterK00–K95
Rankcategory
Official Description

Other functional intestinal disorders

Use a more specific code (4 billable, 3 non-billable)
K59.0Constipationhas subcodesK59.1Functional diarrheaK59.2Neurogenic bowel, not elsewhere classifiedK59.3Megacolon, not elsewhere classifiedhas subcodesK59.4Anal spasmK59.8Other specified functional intestinal disordershas subcodesK59.9Functional intestinal disorder, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 11: Diseases of the Digestive System (K00-K95).

CH11 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • change in bowel habit NOS (R19.4)
  • intestinal malabsorption (K90.-)
  • psychogenic intestinal disorders (F45.8)
Excludes2(Not included here. Code separately if applicable.)
  • functional disorders of stomach (K31.-)

Clinical Hierarchy

BillableHas subcodes
CH11Diseases of the digestive system (K00-K95)
K55-K64Other diseases of intestines (K55-K64)
K59Other functional intestinal disordersNot billable
K59.0ConstipationSubcodes
K59.1Functional diarrheaBillable
K59.2Neurogenic bowel, not elsewhere classifiedBillable
K59.3Megacolon, not elsewhere classifiedSubcodes
K59.4Anal spasmBillable
K59.8Other specified functional intestinal disordersSubcodes
K59.9Functional intestinal disorder, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to K59:

chapterCH11
Diseases of the digestive system (K00-K95)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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