Anorexia nervosa, restricting type, moderate

This code signifies a severe eating disorder characterized by a persistent restriction of energy intake, leading to significantly low body weight. Individuals with this type of anorexia nervosa achieve weight loss primarily through dieting, fasting, or excessive exercise, without recurrent episodes of binge eating or purging behaviors. The "moderate" specifier indicates a Body Mass Index (BMI) between 16 and 16.99 kg/m².

Apply this code when documentation clearly states a diagnosis of anorexia nervosa, restricting type, and specifies a current BMI falling within the moderate severity range (16-16.99 kg/m²). This code is appropriate for initial diagnoses, as well as for follow-up encounters where the patient's condition remains consistent with this severity level and type.

• Ensure the medical record explicitly documents "restricting type" and a BMI that calculates to the moderate severity range.
• Differentiate from F50.02 (anorexia nervosa, binge-eating/purging type) based on the absence of recurrent binge eating or purging.
• Always sequence this code as the primary diagnosis when it is the focus of the encounter.