Billing codes · ICD-10-CM code

F50 eating disorder codes for nutrition claims

By Javier Alvarez · Updated September 29, 2026 · 5 min read

Eating disorder work is some of the most intensive outpatient nutrition care there is: weekly visits, team coordination, and documentation that has to satisfy both medical and behavioral health reviewers. The F50 codes were rebuilt in the FY2025 update. Claims that still carry F50.2 or F50.81 as complete codes are rejected as invalid.

F50 codes with plain-English descriptors

Anorexia nervosa (F50.0-)

Bulimia nervosa (F50.2-)

Binge eating disorder and other eating disorders (F50.8-, F50.9)

What changed, and when

• FY2025 (October 1, 2024): anorexia (both types), bulimia and binge eating disorder got severity characters: mild, moderate, severe, extreme, in remission and unspecified. F50.01, F50.02, F50.2 and F50.81 became headers. Anything billed with those four as complete codes is rejected as an invalid diagnosis.
• FY2026 and FY2027 (October 1, 2025 and October 1, 2026): no changes to F50.

The F50 category excludes anorexia NOS (R63.0) and polyphagia (R63.2), and, as Excludes2, feeding difficulties (R63.3-) and feeding disorders of infancy or childhood (F98.2-). A symptom code isn't a substitute for an eating disorder diagnosis the provider hasn't made.

Choosing the most specific code

• Severity comes from the treating provider. Severity is a clinical judgment by the diagnosing clinician. Your note may describe behaviors and weight trends, but don't pick "moderate" yourself. If the referral doesn't say, use the unspecified code for that type, and ask for the severity on the next update.
• Remission is a diagnosis too. Maintenance nutrition therapy for a patient in remission uses the "in remission" code the provider documents.
• Atypical presentations. Atypical anorexia nervosa is an inclusion term under F50.9 in the tabular list, not under F50.0-. Code what the provider writes.
• BMI as a secondary code. The guidelines give anorexia as an example of an associated diagnosis that allows a Z68 code. Add the measured BMI (or the pediatric percentile) as secondary. See Z68 BMI codes, including the FY2027 change: Z68.1 is now split into Z68.18 and Z68.19.

Coverage: medical, behavioral health, and parity

• Commercial plans. Aetna's CPB 0049 lists eating disorders among the chronic conditions where nutritional counseling is medically necessary, and names F50.00-F50.9 as covered diagnosis codes. Other carriers have their own policies.
• Which benefit. Some plans process eating disorder nutrition therapy under the medical benefit, and others route F-code claims through a behavioral health carve-out with its own network, authorizations and visit rules. Find out which one applies before visit 1. A claim sent to the wrong entity denies even when the service is covered.
• Parity. Section 13007 of the 21st Century Cures Act says that if a group health plan or insurer covers eating disorder benefits, it must provide them consistent with the Mental Health Parity and Addiction Equity Act. In practice, that means limits on those benefits can't be more restrictive than the ones the plan applies to comparable medical/surgical benefits. Parity doesn't create coverage the plan doesn't have, but it's a legitimate basis for questioning a visit limit or prior authorization rule that looks stricter than the plan's medical benefits.
• Medicare. Part B MNT covers diabetes and renal disease only. Eating disorders alone don't qualify.

Pairing with CPT codes

All examples are made up. The Z68.18 example assumes a visit on or after October 1, 2026. Before that date, the code was Z68.1.

What the note must show

• The provider's eating disorder diagnosis with type and severity, from the referral or treatment team's documentation.
• Weight, BMI or percentile, and relevant medical monitoring as reported by the team.
• Your assessment, meal plan or structure, and goals for this phase of treatment.
• Coordination with the therapist, physician or psychiatrist.
• Time face to face, and progress that supports the medical necessity of continued visits.

Charting for medical necessity goes into what reviewers look for.

Denials and fixes

Eating disorders as a practice focus are compared with other niches in best nutrition niches for reimbursement.

For the other diagnosis codes on nutrition claims, see the ICD-10 codes for dietitians reference.