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v1.0.0
ICD-10 Guide
DiagnosesAnorexia

Anorexia

ICD-10 Coding for Anorexia(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?
Essential facts and insights about Anorexia

Key Clinical Considerations:

  • Significant weight loss (typically 15% or more of body weight) or failure to gain weight during a period of growth.
  • Intense fear of gaining weight or becoming fat, even when underweight.
  • Distorted body image, undue influence of body weight or shape on self-evaluation, or persistent lack of recognition of the seriousness of the current low body weight.
  • In females, the absence of at least three consecutive menstrual cycles (amenorrhea).
  • Physical examination may reveal signs of malnutrition, such as bradycardia, hypotension, and lanugo.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's weight history, including baseline weight and current weight.
  • Use specific terminology such as 'anorexia nervosa' and specify the subtype (restricting or binge-eating/purging).
  • Include examples of clinical findings such as vital signs, laboratory results (e.g., electrolyte imbalances), and psychological assessments.
  • Document medical necessity for treatment, including the impact of anorexia on physical and mental health.
  • Quality measures may include tracking weight changes, frequency of therapy sessions, and patient engagement in treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use F50.01 for anorexia nervosa, restricting type, and F50.02 for anorexia nervosa, binge-eating/purging type.
  • Do not use these codes for other eating disorders such as bulimia nervosa (F50.2) or unspecified eating disorders (F50.9).
  • F50.01 and F50.02 are specific to anorexia nervosa; related codes include F50.81 (other specified feeding or eating disorder) and F50.89 (other eating disorders).
  • Common coding errors include misclassifying the type of anorexia or failing to document the severity of the condition.
  • In complex cases, ensure to document all relevant clinical findings and consider comorbid conditions that may affect treatment.

Code Exclusions

Important Exclusions

  • Exclude codes for bulimia nervosa (F50.2) and binge eating disorder (F50.81) as they represent different eating disorders.
  • Alternative codes for excluded conditions may include F50.9 for unspecified eating disorders.
  • Conditions are excluded to ensure accurate representation of the patient's diagnosis and treatment needs.
  • Common exclusion mistakes include misdiagnosing anorexia as bulimia or failing to specify the type of anorexia.
  • Related but distinct conditions include avoidant/restrictive food intake disorder (F50.82) and pica (F50.89).

Related ICD-10 Codes

Primary Codes
F50.01
Anorexia nervosa, restricting type
F50.02
Anorexia nervosa, binge-eating/purging type
Ancillary Codes
Z68.-
Differential Codes
R63.0
R63.0
when anorexia is due to non-psychological causes.
F50.2
F50.2
when the patient is not underweight and exhibits binge/purge behaviors.

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, typically adolescents and young adults.
  • Patient populations may include females more frequently than males, with risk factors including a history of dieting, perfectionism, and family history of eating disorders.
  • Clinical settings include inpatient psychiatric units, outpatient therapy, and emergency departments for acute medical stabilization.
  • Specialty-specific applications are relevant in psychiatry, nutrition, and primary care.
  • Treatment contexts include psychotherapy, nutritional rehabilitation, and medical management of complications.

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 significant weight loss and psychological assessment.'

Template 2

Template: 'Clinical presentation consistent with anorexia nervosa including intense fear of weight gain and distorted body image.'

Template 3

Template: 'Diagnostic criteria for anorexia nervosa met as evidenced by weight loss of 20% and amenorrhea.'

Template 4

Template: 'Treatment plan initiated for anorexia nervosa with nutritional rehabilitation and cognitive behavioral therapy.'

Template 5

Template: 'Follow-up care for anorexia nervosa including monitoring 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?

Documentation should include weight history, clinical findings, and psychological assessments.

How does this differ from similar diagnoses?

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

What are common billing considerations?

Ensure that the diagnosis is clearly documented and supported by clinical findings to optimize reimbursement.

What procedures are typically associated?

Commonly associated procedures include nutritional counseling, psychotherapy (CPT codes 90832-90838), and medical monitoring.

Are there any quality reporting implications?

Quality measures may include tracking treatment adherence, weight stabilization, and patient engagement in therapy.