What Does I/DD Stand For?

Q: What does I/DD stand for?

I/DD stands for intellectual and developmental disabilities. It is an umbrella term for conditions that affect intellectual functioning, physical development, or both. These conditions usually begin during childhood or another developmental period and may create lasting limitations involving learning, communication, self-care, mobility, or daily living.

Q: Is I/DD the same as a learning disability?

No. Some people with intellectual or developmental disabilities may experience learning challenges, but a specific learning disability such as dyslexia is generally different from an intellectual or developmental disability.

Q: Can adults be diagnosed with I/DD?

Yes. An adult may receive a diagnosis, although many disability-service programs require evidence that the condition began during childhood or the developmental period, often before age 18 or 22 depending on the program.

Q: How do I find out if my loved one qualifies for I/DD services?

Contact the local Community Developmental Disabilities Program or the appropriate state agency to begin an eligibility assessment. The process generally reviews the person's diagnosis, age of onset, functional limitations, and ongoing support needs.

Q: Does having an I/DD diagnosis automatically qualify someone for services?

Not always. A diagnosis is an important part of the process, but eligibility may also depend on functional limitations, the level of support needed, program requirements, and applicable financial criteria.

Quick Answer:
What Is I/DD?

In general, I/DD refers to:

Conditions that affect intellectual functioning, physical development, or both
Disabilities that typically begin before birth or during childhood
Conditions that cause lasting limitations in daily living, learning, communication, or self-care
A category used to determine eligibility for a wide range of support services

Breaking Down the Term

Oregon organizes disability services into two main systems. Understanding what each letter stands for helps clarify who qualifies for what.

Intellectual Disabilities (ID)

An intellectual disability affects a person’s ability to learn, reason, and solve problems. It is characterized by:

Below-average intellectual functioning
Significant limitations in adaptive behavior
Onset before age 18

Common examples include Down syndrome and Fragile X syndrome.

Developmental Disabilities (DD)

A developmental disability is a broader category that includes conditions affecting physical, learning, language, or behavioral development. These conditions:

Begin during the developmental period (typically before age 22)
Result in significant functional limitations in major life activities
Are expected to continue indefinitely

Common examples include autism spectrum disorder, cerebral palsy, and epilepsy.

Who Uses the Term I/DD?

The I/DD designation is used across multiple settings, including:

State and federal government agencies administering disability programs
Healthcare providers and specialists
Schools and educational programs
Advocacy organizations and nonprofits
Families and caregivers seeking services

How I/DD Relates to Services and Eligibility

Understanding I/DD matters because it directly affects access to support programs. In Oregon, for example, I/DD services are managed through the state’s developmental disability system.

To qualify for I/DD services, individuals typically must:

Have a qualifying diagnosis such as intellectual disability, autism spectrum disorder, or cerebral palsy
Show onset of the condition before age 18
Demonstrate significant functional limitations in areas like communication, self-care, or mobility
Be determined to need ongoing support to live safely and independently

What Services Are Available for People with I/DD?

Individuals who qualify under the I/DD designation may have access to:

Supported living or in-home care
Employment and job coaching services
Behavioral and health supports
Community participation programs
Family and caregiver assistance

The exact services available depend on individual needs and program eligibility.

Common Misconceptions About I/DD

Clearing up these misunderstandings can help families pursue the right services:

I/DD is not a single diagnosis — it is an umbrella term covering many conditions
Not all developmental disabilities include intellectual disability — the two can exist independently
I/DD services are not only for children — adults with lifelong conditions can receive support throughout their lives
A formal diagnosis is required — self-identifying as having I/DD is not sufficient for service eligibility

Frequently Asked Questions

Is I/DD the same as a learning disability?
No. While some individuals with I/DD may have learning challenges, a learning disability such as dyslexia is generally distinct from an intellectual or developmental disability.

Can adults be diagnosed with I/DD?
Yes, adults can receive a diagnosis, but most I/DD service programs require that the condition began before age 18 or 22, depending on the program.

How do I find out if my loved one qualifies for I/DD services?
Contact your local Community Developmental Disabilities Program (CDDP) or state agency to begin the eligibility assessment process.

Does having an I/DD diagnosis automatically qualify someone for services?
Not always. A diagnosis is an important first step, but eligibility also depends on functional limitations, level of support needed, and in some cases, financial criteria.