ICD-10 F50: Eating Disorder Diagnosis Codes — Billing Guide for Therapists
Anorexia (F50.01/F50.02), bulimia (F50.2), ARFID (F50.82), and binge eating (F50.81) — code selection, insurance coverage challenges, and medical monitoring documentation.
2026-03-28 · 6 min read · By The Superbilled Team
ICD-10 F50 codes cover eating and feeding disorders — anorexia nervosa, bulimia nervosa, binge-eating disorder, and ARFID. Eating disorder billing involves unique insurance challenges, medical monitoring documentation requirements, and coverage restrictions that therapists need to understand before submitting claims.
What Does ICD-10 F50 Cover?
The F50 code cluster maps to the DSM-5 chapter on Feeding and Eating Disorders. These diagnoses share the feature of persistent disturbance in eating behavior that results in impaired physical health or psychosocial functioning. Accurate subcode selection is especially important for eating disorders because payers use the specific code to determine medical necessity for higher levels of care.
F50 Subcodes
| Code | Description |
|---|---|
| F50.00 | Anorexia nervosa, unspecified. Restriction of caloric intake leading to significantly low body weight; intense fear of gaining weight. |
| F50.01 | Anorexia nervosa, restricting type. Weight loss achieved primarily by dieting, fasting, or excessive exercise — no recurrent binge-purge episodes. |
| F50.02 | Anorexia nervosa, binge-eating/purging type. During the episode, the person engages in recurrent binge eating or purging behavior. |
| F50.2 | Bulimia nervosa. Recurrent binge eating + compensatory behaviors (purging, fasting, exercise) occurring at least once weekly for 3 months; body shape/weight influence on self-evaluation. |
| F50.81 | Binge-eating disorder. Recurrent binge eating without compensatory behaviors; associated with distress; occurs at least once weekly for 3 months. |
| F50.82 | Avoidant/Restrictive Food Intake Disorder (ARFID). Eating/feeding disturbance (lack of interest, sensory aversion, fear of adverse consequences) without body image disturbance. Often seen in children and ASD-adjacent presentations. |
| F50.89 | Other specified feeding or eating disorder. Includes atypical anorexia (normal weight), purging disorder, night eating syndrome. |
| F50.9 | Eating disorder, unspecified. Use only when a more specific diagnosis cannot be established. |
Insurance Coverage Challenges for Eating Disorders
Eating disorders face more insurance barriers than most other outpatient diagnoses:
- Medical necessity reviews are common — particularly for anorexia (F50.01/F50.02), where payers often require documentation of current weight, BMI, and medical stability to approve outpatient vs higher levels of care
- Level of care determinations — insurers may redirect clients from outpatient therapy to Intensive Outpatient (IOP), Partial Hospitalization (PHP), or residential based on ASAM or Milliman criteria; document your clinical rationale for outpatient clearly
- Medical monitoring requirements — for anorexia, most payers require concurrent medical monitoring (primary care or psychiatry); document the collaborative care arrangement in your notes
- Binge-eating disorder (F50.81) is generally better covered than anorexia for outpatient therapy, with fewer prior auth requirements
Medical Monitoring Documentation
For anorexia nervosa (F50.01/F50.02) billing, your session notes should reference:
- Whether the client is medically stable (vital signs within acceptable ranges, no severe electrolyte abnormalities) — typically confirmed by the treating physician
- The name and role of the medical provider co-managing the case
- Any behavioral indicators of medical risk (fainting, bradycardia, amenorrhea) documented if present
- Level of care criteria being met and rationale for outpatient (not higher LOC)
CPT Codes Commonly Paired With F50
- 90837 — 60-minute individual psychotherapy. Standard for eating disorder treatment (CBT-E, FBT, DBT-informed approaches). Longer sessions justified by complexity.
- 90791 — Psychiatric diagnostic evaluation. Essential at intake; document eating behaviors, medical status, co-occurring diagnoses, and risk level.
- 90847 — Family therapy with client present. Particularly relevant for adolescent anorexia where Family-Based Treatment (FBT) is the first-line intervention.
- 90853 — Group psychotherapy. Eating disorder groups (DBT skills groups, body image groups) are evidence-based adjuncts to individual therapy.
Documentation Requirements
- Specific eating behaviors: restriction, binge frequency, purge method, ARFID sensory triggers — document concretely
- Body image disturbance (or its absence, for ARFID/binge-eating disorder)
- Weight and BMI at intake (for anorexia subtypes); note whether client is medically stable
- Co-occurring diagnoses: depression (F32/F33), anxiety (F41.1), OCD (F42), PTSD (F43.10), BPD (F60.3) are highly comorbid with eating disorders
- Treatment approach and goals; for anorexia, document weight restoration goals explicitly if applicable
- Coordination with medical provider if client has anorexia or medical complications
Common Denial Reasons
- Lack of medical clearance documentation: For anorexia, payers frequently deny outpatient claims when notes do not reflect current medical stability status.
- Level of care mismatch: If the clinical notes describe a client in severe medical or psychiatric crisis, the insurer may determine outpatient is not the appropriate LOC and deny claims pending higher-level placement.
- Using F50.9 repeatedly: Unspecified codes for eating disorders signal poor diagnostic specificity and may trigger record requests.
Generate a Superbill With F50
Superbilled supports all F50 subcodes and makes it simple to create an insurance-ready superbill for eating disorder treatment. Create your first superbill free.