Illinois Administrative Code
Title 89 - SOCIAL SERVICES
Part 144 - DEVELOPMENTAL DISABILITIES SERVICES
Table D - Guidelines for Determining Levels of Functioning

COGNITIVE ABILITY IQ SCORE

FUNCTIONAL ADAPTIVE BEHAVIORS

PROBLEMS

IDPA LEVEL OF FUNCTIONING

I.

Mild Moderate Severe/

Moderate or Severe Profound

Behavior

Based on Cognitive Ability with Specialized Service I, II, III, if applicable.

If a person's assessed adaptive behaviors are lower than the assessed cognitive ability because of behavior, then the overall functioning should be based upon the person's cognitive ability.

II.

Mild Moderate Severe/Profound

Moderate Severe Severe/Profound

Epilepsy Autism Cerebral Palsy

Based upon adaptive level. May also be eligible for specialized service.

If a person's assessed adaptive behavior is lower than the assessed cognitive ability because of a related condition (epilepsy, autism, cerebral palsy or a seizure disorder which is/are currently active and affect daily living), level of functioning should be based upon the person's adaptive functional behavior.

III.

Mild Moderate Severe/Profound

Moderate or Severe Severe or Profound

None

Based upon the cognitive ability.

If a person's assessed adaptive behavior is lower than the assessed cognitive ability, but not due to a related condition, then the overall level of functioning is based upon the cognitive ability.

IV.

Mild Moderate Severe/Profound

Mild Mild Moderate

None

Based upon adaptive functional behavior.

If a person's assessed adaptive behavior is higher than the assessed cognitive ability, then the overall level of functioning is based upon the adaptive behavior.