ICD-10-CM > F01-F99 > F50-F59 > F50 > F50.0 > F50.01 > F50.013 F50.013 Anorexia nervosa, restricting type, extreme Billable/Specific Copy Code Copy Description Applicable To Anorexia nervosa, restricting type, with a body mass index of less than 15.0 kg/m2