Disabled dependent extension of eligibility

[jeanine]

State law requires extension of eligibility for a disabled dependent reaching the attaining age of the plan as long as the dependent was confirmed as disabled before reaching the age. Self-funded plan has same provision. We are redrafting our disability extension application. We cite state law as requiring the extension. Question: Does federal law also require this? We are not suggesting any SF plan drop this extension of benefit, I'm just looking to cite a specific law.