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ICD-10 Guide
DiagnosesAnorexia Nervosa

Anorexia Nervosa

ICD-10 Coding for Anorexia Nervosa(F50.01, F50.02)

PRIMARY SPECIALTYPsychiatry
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Anorexia Nervosa?
Essential facts and insights about Anorexia Nervosa

Key Clinical Considerations:

  • Refusal to maintain a body weight at or above a minimally normal weight for age and height.
  • Intense fear of gaining weight or becoming fat, even though underweight.
  • Disturbance in the way in which one's body weight or shape is experienced, undue influence of body weight or shape on self-evaluation, or persistent lack of recognition of the seriousness of the current low body weight.
  • Laboratory findings may include electrolyte imbalances, anemia, or other nutritional deficiencies.
  • Physical examination may reveal signs such as emaciation, lanugo, bradycardia, hypotension, and dry skin.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's weight, height, and BMI at each visit.
  • Use specific terminology such as 'anorexia nervosa' and specify the subtype if applicable.
  • Examples include: 'Patient presents with significant weight loss and fear of gaining weight, meeting criteria for anorexia nervosa.'
  • Document medical necessity for treatment, including psychological evaluations and nutritional assessments.
  • Quality measures may include tracking weight changes, psychological assessments, and treatment adherence.

Coding Guidelines

Usage Guidelines & Examples

  • Use F50.01 for anorexia nervosa, restricting type, and F50.02 for binge-eating/purging type.
  • Do not use these codes for patients with other eating disorders such as bulimia nervosa or avoidant/restrictive food intake disorder.
  • F50.81 (Other specified feeding or eating disorder) may be used for atypical presentations.
  • Common errors include misclassifying the type of anorexia or using codes for other eating disorders.
  • In complex cases, ensure to document the specific type and any co-occurring mental health conditions.

Code Exclusions

Important Exclusions

  • Exclude codes for bulimia nervosa (F50.2) and avoidant/restrictive food intake disorder (F50.89).
  • Use F50.81 for atypical eating disorders that do not meet full criteria for anorexia nervosa.
  • Conditions are excluded due to differing diagnostic criteria and treatment approaches.
  • Common mistakes include using anorexia codes for patients with bulimia or other eating disorders.
  • Related but distinct conditions include binge eating disorder and pica.

Related ICD-10 Codes

Primary Codes
F50.01
Anorexia nervosa, restricting type
F50.02
Anorexia nervosa, binge-eating/purging type
Ancillary Codes
E43
Differential Codes
R63.0
R63.0
for loss of appetite not related to psychological disorders.
F50.2
F50.2
when binge-eating occurs without significant weight loss.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Psychiatry

Specialty Applications

  • Applies to individuals diagnosed with anorexia nervosa.
  • Commonly affects adolescents and young adults, with a higher prevalence in females.
  • Clinical settings include inpatient psychiatric units, outpatient therapy, and emergency departments.
  • Relevant for psychiatrists, psychologists, dietitians, and primary care providers.
  • Used in treatment contexts involving psychotherapy, nutritional rehabilitation, and medical management.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with anorexia nervosa based on clinical findings of significant weight loss and fear of gaining weight.'

Template 2

Template: 'Clinical presentation consistent with anorexia nervosa including refusal to maintain a healthy weight and distorted body image.'

Template 3

Template: 'Diagnostic criteria for anorexia nervosa met as evidenced by weight <85% of expected and intense fear of weight gain.'

Template 4

Template: 'Treatment plan initiated for anorexia nervosa with a focus on nutritional rehabilitation and psychotherapy.'

Template 5

Template: 'Follow-up care for anorexia nervosa including monitoring of weight and psychological status.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Document weight, BMI, clinical symptoms, and treatment plans.

How does this differ from similar diagnoses?

Anorexia nervosa is characterized by significant weight loss and fear of weight gain, unlike bulimia nervosa which involves binge eating.

What are common billing considerations?

Ensure medical necessity is documented and that the correct subtype is coded.

What procedures are typically associated?

CPT codes for psychotherapy, nutritional counseling, and medical evaluations.

Are there any quality reporting implications?

Quality measures may include tracking weight, psychological assessments, and treatment adherence.