ICD-10-CM K59: Other functional intestinal disorders

ICD-10-CM Diagnosis Code (2025)

Official Description for K59

Other functional intestinal disorders

Coding Notes & Guidelines for K59

Excludes1: Not Coded Here
  • change in bowel habit NOS (R19.4)
  • intestinal malabsorption (K90.-)
  • psychogenic intestinal disorders (F45.8)
Excludes1: Not Coded Here

fecal impaction (K56.41)

Excludes1: Not Coded Here
  • diarrhea NOS (R19.7)
  • irritable bowel syndrome with diarrhea (K58.0)
Excludes1: Not Coded Here
  • congenital megacolon (aganglionic) (Q43.1)
  • megacolon (due to) (in) Chagas' disease (B57.32)
  • megacolon (due to) (in) Clostridium difficile (A04.7-)
  • megacolon (due to) (in) Hirschsprung's disease (Q43.1)
Excludes2: Not Included Here

functional disorders of stomach (K31.-)

Excludes2: Not Included Here

incomplete defecation (R15.0)

Code First

, if applicable (T51-T65) to identify toxic agent

Use Additional Code

code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Inclusion Terms

Functional constipation

Inclusion Terms

Chronic constipation

Inclusion Terms

Dilatation of colon

Inclusion Terms

Megacolon NOS

Inclusion Terms

Proctalgia fugax

Inclusion Terms

Acute colonic pseudo-obstruction (ACPO)

Inclusion Terms
  • Atony of colon
  • Pseudo-obstruction (acute) (chronic) of intestine

Child Codes (More Specific Codes for K59):

K59.0 - Constipation K59.00 - Constipation, unspecified K59.01 - Slow transit constipation K59.02 - Outlet dysfunction constipation K59.03 - Drug induced constipation K59.04 - Chronic idiopathic constipation K59.09 - Other constipation K59.1 - Functional diarrhea K59.2 - Neurogenic bowel, not elsewhere classified K59.3 - Megacolon, not elsewhere classified K59.31 - Toxic megacolon K59.39 - Other megacolon K59.4 - Anal spasm K59.8 - Other specified functional intestinal disorders K59.81 - Ogilvie syndrome K59.89 - Other specified functional intestinal disorders K59.9 - Functional intestinal disorder, unspecified

About ICD-10-CM Code K59 (Other functional intestinal disorders)

ICD-10-CM code K59 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM K59 became effective on October 1, 2024.

This page provides detailed information about K59 - Other functional intestinal disorders. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other functional intestinal disorders.