EDNOS stands for Eating Disorder Not Otherwise Specified, a diagnostic category that was used for people whose eating disorder symptoms were real and serious but didn’t fit neatly into the criteria for anorexia nervosa or bulimia nervosa. It was the most commonly given eating disorder diagnosis under the previous edition of the diagnostic manual (DSM-IV), serving as a catch-all for a wide range of disordered eating patterns. In 2013, EDNOS was replaced by a new term, OSFED (Other Specified Feeding or Eating Disorder), when the DSM-5 was published.
Why EDNOS Existed
Eating disorders don’t always look like the textbook descriptions of anorexia or bulimia. Someone might restrict food severely and fear weight gain but not meet the exact weight threshold for anorexia. Another person might binge and purge, but less frequently than the criteria required for bulimia. Under the DSM-IV, all of these people received the same label: EDNOS. The category also included binge eating disorder, which at the time wasn’t recognized as its own diagnosis.
This created problems. EDNOS grouped together people with very different symptoms and needs. A person who binged without purging had little in common clinically with someone who purged without binging, yet both carried the same diagnosis. The label also carried an unintended implication that these conditions were somehow less serious or less “real” than anorexia or bulimia, even though the medical and psychological consequences could be just as severe.
What Changed With the DSM-5
When the DSM-5 was released in 2013, one of its explicit goals was to shrink the oversized EDNOS category. Two major changes accomplished this. First, binge eating disorder was promoted to a standalone diagnosis alongside anorexia and bulimia. Second, the remaining residual category was renamed OSFED and given more specific subcategories to clarify what clinicians were actually seeing.
The changes worked as intended. Studies tracking diagnosis rates before and after the DSM-5 transition found that the prevalence of the catch-all category decreased, while diagnosis rates for anorexia, bulimia, and binge eating disorder increased. People who previously would have been lumped into EDNOS were now receiving more precise diagnoses.
The Five OSFED Subtypes
OSFED includes five recognized presentations, each describing a distinct pattern of disordered eating.
- Atypical anorexia nervosa: The person has all the features of anorexia, including significant weight loss, food restriction, and intense fear of gaining weight, but their current weight falls in the normal or above-normal range. The DSM-5 doesn’t specify a BMI cutoff or define what counts as “significant” weight loss, which leaves room for clinical judgment. Despite the name, this presentation is not mild. Someone who drops from 250 pounds to 170 pounds through severe restriction can experience the same dangerous metabolic and cardiac effects as someone at a very low weight.
- Sub-threshold bulimia nervosa: Binge-purge cycles that occur less frequently or for a shorter duration than the criteria for full bulimia require.
- Sub-threshold binge eating disorder: Binge eating episodes that happen less often or over a shorter time span than what’s needed for a binge eating disorder diagnosis.
- Purging disorder: Recurrent purging behavior (self-induced vomiting, laxative misuse, or other methods) used to influence weight or shape, but without binge eating episodes. This distinguishes it from bulimia, where purging follows a binge.
- Night eating syndrome: Eating at least 25% of daily calories after the evening meal, or waking up at least twice a week specifically to eat. That 25% threshold has been used in research since the 1950s and has held up as a reliable marker separating people with night eating syndrome from typical late-night snackers.
How Common It Is
Even after the DSM-5 reduced its scope, OSFED remains more common than anorexia or bulimia individually. One study of point prevalence found OSFED in about 5% of the sample, compared to 2% for anorexia and 1% for bulimia. A lifetime prevalence study found even larger gaps: 11.5% for OSFED versus 0.8% for anorexia and 2.6% for bulimia. The numbers vary depending on the population studied and the methodology used, but the pattern is consistent. The “other” category still captures a large share of people with eating disorders.
Treatment for OSFED
Cognitive behavioral therapy designed for eating disorders (often called CBT-E, for “enhanced”) is one of the most well-supported treatments and is used across the full range of eating disorder diagnoses, including OSFED. It works by identifying the thoughts and behaviors that maintain the eating disorder and replacing them with healthier patterns. For people who aren’t underweight, CBT-E is a widely used first-line approach. Treatment typically addresses restriction, binge eating, purging, body image distortions, and the rigid rules about food and weight that keep the disorder going.
The specific treatment approach often depends on which OSFED subtype is present. Someone with atypical anorexia may need a plan focused on restoring adequate nutrition and addressing fear of weight gain, while someone with purging disorder may need a different emphasis entirely. The flexibility of the OSFED category means treatment has to be tailored to the individual rather than applied from a single template.
Barriers to Getting Help
People with an OSFED diagnosis face more obstacles to treatment than those diagnosed with anorexia or bulimia. Research on treatment access in the United States found that financial barriers, particularly lack of insurance coverage, were the most commonly reported challenge overall. But people with OSFED reported disproportionately more barriers across the board, including difficulty getting their eating disorder recognized in the first place, limited treatment options in their geographic area, and lower perceived quality of the care they did receive.
These gaps are even wider for people from underrepresented backgrounds. The same study found that people of color, transgender individuals, and others with historically marginalized identities faced compounded barriers related to finances, location, and sociocultural factors when seeking OSFED treatment. The lingering perception that OSFED is a “lesser” diagnosis, a holdover from the EDNOS era, continues to shape how seriously the condition is taken by insurers, providers, and sometimes patients themselves.
If you or someone you know received an EDNOS diagnosis in the past, it’s worth knowing that the condition would likely be classified more specifically today. The name has changed, but the core reality hasn’t: these are serious eating disorders that respond to evidence-based treatment when people can access it.