ICD-10-CM Diagnosis Code K51.813

code to identify any associated fistulas, if applicable:

anal fistula (K60.3-)

anorectal fistula (K60.5-)

rectal fistula (K60.4-)

code to identify manifestations, such as:

pyoderma gangrenosum (L88)

Crohn's disease [regional enteritis] (K50.-)

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)