IDD services

IDD is an umbrella, not a single benefit. On the institutional side sits the ICF/IID, which Medicaid.gov calls an optional benefit that every state nonetheless offers. It is only for people who need and receive active treatment, and that need must arise from an intellectual disability or a related condition. The test for a related condition is mainly functional rather than diagnostic, but the condition must have shown itself before age 22 and be likely to continue indefinitely¹.

In the community, states pay for IDD supports through home and community-based services waivers. Habilitation, both day and residential, respite care and case management are among the services Medicaid.gov lists for 1915(c) waivers, and states set the maximum number of people each waiver serves². South Carolina’s waiver for intellectual disability and related disabilities shows a typical package: employment services, day services such as career preparation and day activity, case management, respite, and residential habilitation, meaning care, skills training and supervision in a setting that is not an institution³. One difference matters to families and providers alike: states may keep waiting lists for waiver services, but they may not limit access to ICF/IID care that way¹.

For billing, IDD services are paid service by service against the person’s plan. Each provider bills only the services and units the plan authorizes for it, in the unit the state assigns, with attendance records, service notes or EVV visits behind every unit. Watch for overlaps across providers: two agencies billing the same hours, or a day service billed on a day the person was in hospital.