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0 Irritable bowel syndrome with diarrhea

K58.9 Irritable bowel syndrome without diarrhea

Irritable bowel syndrome NOS

K59 Other functional intestinal disorders

Excludes1: change in bowel habit NOS (R19.4)

intestinal malabsorption (K90.-)

psychogenic intestinal disorders (F45.8)

Excludes2: functional disorders of stomach (K31.-)

K59.0 Constipation

K59.00 Constipation, unspecified

K59.01 Slow transit constipation

K59.02 Outlet dysfunction constipation

K59.09 Other constipation

K59.1 Functional diarrhea

Excludes1: diarrhea NOS (R19.7)

irritable bowel syndrome with diarrhea (K58.0)

K59.2 Neurogenic bowel, not elsewhere classified

K59.3 Megacolon, not elsewhere classified

Dilatation of colon

Toxic megacolon

Code first (T51-T65) to identify toxic agent

Excludes1: congenital megacolon (aganglionic) (Q43.1)

Hirschsprung's disease (Q43.1)

megacolon in Chagas' disease (B57.32)

K59.4 Anal spasm

Proctalgia fugax

K59.8 Other specified functional intestinal disorders

Atony of colon

Pseudo-obstruction (acute) (chronic) of intestine

K59.9 Functional intestinal disorder, unspecified

K60 Fissure and fistula of anal and rectal regions

Excludes1: fissure and fistula of anal and rectal regions with abscess or cellulitis (K61.-)

Excludes2: anal sphincter tear (healed) (nontraumatic) (old) (K62.81)

K60.0 Acute anal fissure

K60.1 Chronic anal fissure

K60.2 Anal fissure, unspecified

K60.3 Anal fistula

K60.4 Rectal fistula

Fistula of rectum to skin

Excludes1: rectovaginal fistula (N82.3)

vesicorectal fistual (N32.1)

K60.5 Anorectal fistula

K61 Abscess of anal and rectal regions

Includes: