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 tear of anal sphincter (S31.831)
 * K62.82 Dysplasia of anus
 * Anal intraepithelial neoplasia I and II (AIN I and II) (histologically confirmed)
 * Dysplasia of anus NOS
 * Mild and moderate dysplasia of anus (histologically confirmed)
 * Excludes1: abnormal results from anal cytologic examination without histologic confirmation (R85.61-)
 * anal intraepithelial neoplasia III (D01.3)
 * carcinoma in situ of anus (D01.3)
 * HGSIL of anus (R85.613)
 * severe dysplasia of anus (D01.3)
 * K62.89 Other specified diseases of anus and rectum
 * Proctitis NOS
 * K62.9 Disease of anus and rectum, unspecified

K63 Other diseases of intestine

 * K63.0 Abscess of intestine
 * Excludes1: abscess of intestine with Crohn's disease (K50.04, K50.14, K50.84, K50.94,)
 * abscess of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)
 * abscess of intestine with ulcerative colitis (K51.04, K51.14, K51.24, K51.34, K51.44, K51.54, K51.84, K51.94)
 * Excludes2: abscess of anal and rectal regions (K61.-)
 * abscess of appendix (K35.2)
 * K63.1 Perforation of intestine (nontraumatic)
 * Perforation (nontraumatic) of rectum
 * Excludes1: perforation (nontraumatic) of duodenum (K26.-)
 * perforation (nontraumatic) of intestine with diverticular disease (K57.0, K57.2, K57.4, K57.8)
 * Excludes2: perforation (nontraumatic) of appendix (K35.2, K35.3)
 * K63.2 Fistula of intestine
 * Excludes1: fistula of duodenum (K31.6)
 * fistula of intestine with Crohn?s disease (K50.03, K50.13, K50.83, K50.93,)
 * fistula of intestine with ulcerative colitis (K51.03, K51.13, K51.23, K51.33, K51.43, K51.53, K51.83, K51.93)
 * Excludes2: fistula of anal and rectal regions (K60.-)
 * fistula of appendix (K38.3)
 * intestinal-genital fistula, female (N82.2-N82.4)
 * vesicointestinal fistula (N32.1)
 * K63.3 Ulcer of intestine
 * Primary ulcer of small intestine
 * Excludes1: duodenal ulcer (K26.-)
 * gastrointestinal