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ICD-10 Guide
ICD-10 CodesF50.21

F50.21

Billable

Bulimia nervosa, mild

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 F50.21 is a billable code used to indicate a diagnosis of bulimia nervosa, mild.

Key Diagnostic Point:

Bulimia nervosa is an eating disorder characterized by recurrent episodes of binge eating followed by inappropriate compensatory behaviors to prevent weight gain, such as self-induced vomiting, misuse of laxatives, fasting, or excessive exercise. The diagnosis of mild bulimia nervosa is made when the individual exhibits a frequency of binge-eating episodes occurring less than once a week on average over the last three months. Patients may present with a preoccupation with body image and weight, leading to significant distress and impairment in social, occupational, or other important areas of functioning. Physical complications can include electrolyte imbalances, gastrointestinal issues, dental erosion, and cardiovascular problems. The disorder often coexists with other mental health conditions, such as anxiety and depression, making comprehensive treatment essential. Early diagnosis and intervention can improve outcomes and reduce the risk of developing more severe forms of the disorder.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in symptom presentation among patients
  • Need for thorough documentation of binge-eating frequency
  • Differentiation from other eating disorders
  • Potential co-morbid mental health conditions

Audit Risk Factors

  • Inadequate documentation of binge-eating frequency
  • Failure to document compensatory behaviors
  • Misclassification of severity level
  • Lack of comprehensive treatment plans

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed mental health assessments, including history of eating behaviors and co-morbid conditions.

Common Clinical Scenarios

Patients presenting with anxiety or depression alongside eating disorder symptoms.

Billing Considerations

Consideration of psychological evaluations and treatment plans is crucial for accurate coding.

Nutrition

Documentation Requirements

Nutritional assessments and dietary history must be documented.

Common Clinical Scenarios

Patients seeking nutritional counseling for weight management and eating disorder recovery.

Billing Considerations

Documentation should include dietary patterns and any nutritional deficiencies.

Coding Guidelines

Inclusion Criteria

Use F50.21 When
  • According to ICD
  • 10 guidelines, F50
  • 21 should be used when the patient meets the criteria for mild bulimia nervosa, specifically the frequency of binge
  • eating episodes and compensatory behaviors
  • Documentation must clearly reflect these criteria

Exclusion Criteria

Do NOT use F50.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

90834CPT Code

Psychotherapy, 45 minutes with patient

Clinical Scenario

Used during therapy sessions for patients diagnosed with bulimia nervosa.

Documentation Requirements

Document the nature of the therapy and progress notes.

Specialty Considerations

Psychiatrists should ensure that the treatment plan aligns with the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of eating disorders, including bulimia nervosa. This specificity aids in better tracking of treatment outcomes and resource allocation for mental health services.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of eating disorders, including bulimia nervosa. This specificity aids in better tracking of treatment outcomes and resource allocation for mental health services.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of eating disorders, including bulimia nervosa. This specificity aids in better tracking of treatment outcomes and resource allocation for mental health services.

Resources

Clinical References

  • •
    National Eating Disorders Association

Coding & Billing References

  • •
    National Eating Disorders Association

Frequently Asked Questions

What distinguishes mild bulimia nervosa from moderate or severe?

Mild bulimia nervosa is characterized by binge-eating episodes occurring less than once a week, while moderate and severe forms involve more frequent episodes and potentially more severe compensatory behaviors.