What makes eating disorder billing different
Eating disorder treatment billing is some of the most contested billing in behavioral health. Programs deliver care across levels — residential, partial hospitalization, intensive outpatient and outpatient — and payers review every step up and step down for medical necessity, often through concurrent reviews that decide whether the patient keeps their bed. A single missing review response or a level-of-care downgrade can turn weeks of care into denied days.
Programs that hand eating disorder treatment billing to a specialized partner get the authorization calendar, the continued-stay documentation and the appeals handled before days are lost. Fastora's certified billing and coding professionals handle eating disorder claims as part of our wider medical billing services.
Federal parity law requires plans to cover mental health and substance use treatment comparably to medical care, but eating disorder programs still see medical-necessity denials, visit limits and carve-outs that medical-surgical claims do not face. Knowing the plan's actual benefit language — and when to push back on a denial that violates it — is part of the job.
Levels of care and how each bills
Eating disorder care moves patients through levels as their medical and psychiatric status changes: medical stabilization, residential, partial hospitalization (PHP), intensive outpatient (IOP) and outpatient follow-up. Each level bills differently — residential and PHP often bill per diem or bundled day rates on institutional claims, while IOP and outpatient bill professional claims by session.
The transitions are the risk points. A payer that authorizes PHP but not the residential step-down, or that approves IOP days but cuts them mid-course, leaves the program holding the cost. We track authorizations by level and by date, and the clinical team gets a calendar of when each review is due.
Therapy, family and nutrition coding
| Code | Descriptor (summary) | Billing note |
|---|---|---|
| 90832 / 90834 / 90837 | Individual psychotherapy | By session length: 30, 45 or 60 minutes |
| 90853 | Group psychotherapy | Not per-patient time; check payer group rules |
| 90847 | Family psychotherapy with patient present | Common in adolescent and family-based treatment |
| 90846 | Family psychotherapy without patient present | Some plans limit or exclude |
| 99202-99215 | Office/outpatient E/M | Medical management and psychiatric evaluation |
| 97802-97804 | Medical nutrition therapy | Often denied; dietitian credentialing critical |
Nutritional counseling is clinically central to eating disorder treatment and frequently denied by payers, which makes dietitian credentialing and benefit verification especially important. Family involvement is also central, particularly for adolescents — family psychotherapy codes need the right documentation of who participated and why.
Our medical coding team reviews session documentation against the codes billed, because time-based psychotherapy codes deny quickly when the note does not support the time.
Authorization and concurrent review discipline
Admission to residential or PHP almost always needs prior authorization, and continued stay then runs on concurrent reviews — the payer's reviewer decides every few days whether the patient still meets criteria. Reviews use medical-necessity criteria that weigh medical stability, psychiatric symptoms, weight trends and treatment engagement.
The operational discipline is unforgiving: the review request has to go out on time, with current vitals, weights, labs and clinical updates. A late or thin review response produces a denial for the days after the last approved date, and those days are the hardest to recover on appeal.
Common eating disorder denials and how we prevent them
| Denial | Typical cause | Prevention step |
|---|---|---|
| Continued-stay denial | Review response late or missing current clinical data | Review calendar with clinical data assembled before the due date |
| Level-of-care downgrade | Payer steps down to IOP while the team recommends residential | Criteria-based appeal prepared with the clinical record |
| Out-of-network denial | Program not contracted; no single-case agreement | SCA requested at admission when the plan allows it |
| Nutrition therapy denied | Dietitian not credentialed or benefit excluded | Dietitian enrollment and benefit verified before the first session |
| Session time mismatch | Note does not support the billed psychotherapy time | Time documented and reconciled to the code before submission |
When a program is out of network with a patient's plan, a single-case agreement negotiated at admission can secure in-network-level payment for the episode. These agreements take time and clinical justification, so they have to start at admission, not after the first denial.
Every claim passes our Advanced Pre-Submission Claim Review before submission. Denials that still occur are worked by our denial management team, which corrects and resubmits or appeals with the clinical record.
Credentialing for eating disorder programs
Psychiatrists, psychologists, therapists and dietitians each need enrollment with the plans the program bills, and residential and PHP programs need facility-level credentialing where payers require it. Because programs bill both professional and institutional claims, enrollment gaps can shut down revenue on both sides at once.
Our credentialing and enrollment service tracks each clinician and each facility enrollment through a nine-stage process, from document collection and NPI and CAQH setup to payer applications, follow-ups and final approval.
How Fastora supports eating disorder billing
Fastora works inside your existing EHR/PM system under the user access you grant, with no software to install and no hidden setup fees. You get a dedicated account contact, transparent dashboards, monthly performance reporting and a monthly review call.
Fees are quoted after a free assessment, and you can read how our pricing models work beforehand. To see how your current claims hold up, start with a free billing assessment.