PURPOSE: The present study describes the occurrence of eating disorder (ED)-related medical diagnoses in a publicly insured sample of youth with EDs. The study also compares ED medical diagnoses with other psychiatric disorders and identifies high-risk demographic groups. Improved screening practices are needed in public mental health systems where treatment is critical for youth with EDs. METHODS: Medicaid claims data were obtained from the state of California, including beneficiaries ages 7-18 who had at least one service episode between January 1, 2014, and December 31, 2016. From this population we extracted demographic and claims data for those youth who received an ED diagnosis during the 3-year period as a primary or secondary diagnosis (n = 8,075). Random subsamples of youth with moderate/severe mental illness were drawn for comparison: primary or secondary diagnosis of mood/anxiety disorder (N = 8,000) or psychotic disorder (n = 8,000) were also extracted. Medical diagnoses were compared within youth with EDs (across diagnostic categories) and across psychiatric diagnoses (EDs, mood/anxiety disorders, psychotic disorders). Logistic regression analyses were used to adjust for demographic characteristics. RESULTS: Three-quarters of youth with EDs received no diagnosis of an ED-related medical complication. Bradycardia was the most prevalent diagnosis suggestive of medical instability. Odds of medical diagnosis were greater for ED than other psychiatric disorders but varied with age and gender. Across all diagnoses, Latinx youth were less likely to receive ED-related diagnoses suggesting medical instability. DISCUSSION: Most publicly insured youth with EDs received no ED-related medical diagnosis, underscoring the structural barriers to receiving expert medical care.