Irritable bowel syndrome 肠易激综合征K59 Other functional intestinal disorders 其他功能性肠病:K59.0 Constipation 便秘K59.1 Functional diarrhoea 功能性腹泻K59.4 Anal spasm 直肠痉挛K59.8 Other specified functional intestinal disorders 其他特异功能肠病K59.9 Functional intestinal disorder, unspecified 功能性肠...