F50.013 Anorexia nervosa, restricting type, extreme

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Anorexia nervosa, restricting type, with a body mass index of less than 15.0 kg/m2

Applies from F50 Eating disorders

Excludes1 (never code together)

• anorexia NOS (R63.0)
• feeding problems of newborn (P92.-)
• polyphagia (R63.2)

Excludes2 (not included here)

• feeding difficulties (R63.3-)
• feeding disorder in infancy or childhood (F98.2-)

Applies from F50.0 Anorexia nervosa

Excludes1 (never code together)

• loss of appetite (R63.0)
• psychogenic loss of appetite (F50.89)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 153 — Personality Disorders; Anorexia/Bulimia Nervosa
• RxHCC V08: HCC 133 — Anxiety and Other Psychiatric Disorders

MS-DRG index

Defines the logic of DRG(s) 883 in MDC 19.

Code annotations containing back-references to F50.013

Back-references to F50.0

• Code First: K31.84 Gastroparesis ("anorexia nervosa (F50.0-)")
• Type 1 Excludes: R63.0 Anorexia ("anorexia nervosa (F50.0-)")
• Type 1 Excludes: R63.6 Underweight ("anorexia nervosa (F50.0-)")

Back-references to F50

• Type 2 Excludes: F98.2 Other feeding disorders of infancy and childhood ("anorexia nervosa and other eating disorders (F50.-)")
• Type 1 Excludes: P92 Feeding problems of newborn ("eating disorders (F50.-)")
• Type 2 Excludes: R63.3 Feeding difficulties ("eating disorders (F50.-)")
• Type 1 Excludes: Z72.4 Inappropriate diet and eating habits ("eating disorders (F50.-)")

Nearby codes

• F50.00 Anorexia nervosa, unspecified
• F50.01 Anorexia nervosa, restricting type
• F50.010 Anorexia nervosa, restricting type, mild
• F50.011 Anorexia nervosa, restricting type, moderate
• F50.012 Anorexia nervosa, restricting type, severe
• F50.013 Anorexia nervosa, restricting type, extreme (this code)
• F50.014 Anorexia nervosa, restricting type, in remission
• F50.019 Anorexia nervosa, restricting type, unspecified
• F50.02 Anorexia nervosa, binge eating/purging type
• F50.020 Anorexia nervosa, binge eating/purging type, mild
• F50.021 Anorexia nervosa, binge eating/purging type, moderate