Anorexia nervosa, restricting type, mild

This code identifies a severe eating disorder characterized by self-imposed restriction of energy intake leading to significantly low body weight, an intense fear of gaining weight, and a distorted body image. Specifically, it denotes the restricting subtype, where the individual primarily achieves weight loss through dieting, fasting, and/or excessive exercise, without recurrent episodes of binge eating or purging. The "mild" specifier indicates the current BMI is between 17 and 18.49 kg/m².

Apply this code when documentation clearly indicates a diagnosis of anorexia nervosa, restricting type, and the patient's current BMI falls within the mild severity range (17-18.49 kg/m²). This code is appropriate for initial diagnosis, ongoing management, or follow-up encounters where the patient's condition aligns with these criteria. Supporting documentation should include a psychiatric evaluation, BMI calculation, and a history detailing restrictive behaviors.

• Ensure the documentation explicitly states "restricting type" and provides the current BMI to support the "mild" severity specifier.
• Differentiate from F50.02 (anorexia nervosa, binge-eating/purging type) based on the absence of recurrent binge eating or purging behaviors.
• Always sequence this code as the primary diagnosis when it is the focus of the encounter.