What Is Considered a Disability for Employment: ADA Tests and Exclusions

For employment purposes under federal law, a disability is a physical or mental impairment that substantially limits one or more major life activities. That is the definition set by the Americans with Disabilities Act, and what is considered a disability for employment is broader than most people expect: it isn’t limited to visible conditions or permanent impairments, and it covers conditions in remission, episodic disorders, and even how an employer perceives you.¹ What matters is not the diagnosis itself but how the condition affects your ability to function.

The Three Ways a Condition Qualifies

The ADA uses a three-part framework. You are considered to have a disability if any one of these applies:²

You have a current physical or mental impairment that substantially limits a major life activity.
You have a documented record of such an impairment, even if you have recovered.
Your employer regards you as having such an impairment, whether or not you actually do.

Most claims involve the first prong. The second protects people with a medical history — someone whose cancer is in remission, or who recovered from a serious injury years ago, cannot be held to that history when applying for a job or seeking a promotion.¹ The third catches employers who act on assumptions: if your boss reassigns you to a lesser role because they assume your controlled high blood pressure makes you a health risk, that is disability discrimination based on perception.² One limit on the “regarded as” prong: it protects you from discrimination but does not entitle you to reasonable accommodations if you don’t actually have a substantially limiting impairment.³

What “Substantially Limits” Means in Practice

The impairment doesn’t have to leave you unable to perform an activity at all. The standard is whether your condition meaningfully restricts your ability compared to most people. A back condition that limits you to standing for only a few minutes at a time, or a cognitive condition that makes sustained concentration extremely difficult, can qualify. The 2008 ADA Amendments Act made clear that this analysis should favor broad coverage and “should not demand extensive analysis.”⁴

Two rules shape this determination. First, the limitation only needs to affect one major life activity. It doesn’t have to restrict several.²

Second, and this is the rule that surprises people: the assessment ignores the effects of medication, hearing aids, prosthetics, assistive technology, and other mitigating measures. If your epilepsy is well-controlled by medication, the question is how the epilepsy would affect you without it, not how you function on a good day with treatment.⁵ The only exception is ordinary eyeglasses and contact lenses, whose corrective effects can be considered.

Major Life Activities the Law Recognizes

The statute lists a wide range of activities, and the list is not exhaustive. It covers everyday things most people take for granted: caring for yourself, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating, and working.²

The 2008 amendments added a second category: major bodily functions. This is where the law catches conditions that aren’t visible from the outside but still impose real limitations. The list includes the operation of the immune system, normal cell growth, digestive function, bowel and bladder function, neurological and brain function, respiratory and circulatory function, endocrine function, and reproductive function.² Someone with Crohn’s disease that disrupts digestive function has a disability under the ADA, even if coworkers cannot see the limitation.

Episodic Conditions and Conditions in Remission

Conditions that flare up and subside — multiple sclerosis, epilepsy, or major depressive disorder, for example — don’t lose protection just because the person feels fine between episodes. The statute says an impairment that is episodic or in remission qualifies as a disability if it would substantially limit a major life activity when active.² An employer can’t argue that a worker wasn’t really disabled at the exact moment they were fired or denied a promotion.

Examples of Impairments That Routinely Qualify

Having a diagnosis alone doesn’t guarantee ADA protection. The condition still has to substantially limit a major life activity. But the 2008 amendments lowered the bar enough that a wide range of conditions routinely qualify.

Physical impairments recognized under the ADA include cancer, diabetes, HIV, epilepsy, cerebral palsy, muscular dystrophy, deafness, blindness, and mobility impairments requiring a wheelchair or similar device.¹

Mental and psychological conditions qualify on the same terms. Major depressive disorder, PTSD, bipolar disorder, autism, traumatic brain injury, obsessive-compulsive disorder, and learning disabilities are all recognized.¹ Mental impairments don’t need to be obvious to others. Depression that makes concentration nearly impossible, or PTSD that severely disrupts sleep, limits a major life activity even if the person looks fine at the office.

What Doesn’t Count

Not everything qualifies. The law carves out specific exclusions.

Transitory and Minor Conditions

Under the “regarded as” prong, the ADA doesn’t apply to impairments that are both transitory and minor. A transitory impairment is one with an actual or expected duration of six months or less.² A seasonal flu or a simple broken bone that heals normally falls here. Both conditions must be met. A six-month impairment that is serious, or a minor impairment that is permanent, can still qualify.

Current Illegal Drug Use

If you are currently using illegal drugs, the ADA does not protect you when your employer acts based on that use. The law does protect people who have completed a supervised rehabilitation program and are no longer using, are currently participating in such a program and are no longer using, or are wrongly believed to be using drugs when they aren’t.⁶ Employers can still enforce drug-free workplace policies and conduct drug testing, including on employees in recovery.

Alcoholism is handled differently. An employer can prohibit alcohol in the workplace and can hold an employee with alcoholism to the same performance and behavior standards as everyone else, even if unsatisfactory performance is related to the drinking.⁶ But the employer cannot fire or refuse to hire someone simply because they are an alcoholic.

Categorically Excluded Conditions

The ADA specifically excludes compulsive gambling, kleptomania, pyromania, and certain sexual behavior disorders from the definition of disability.⁷

Pregnancy Sits Outside the ADA

Pregnancy itself is not a disability under the ADA. Pregnancy-related complications that substantially limit a major life activity — such as gestational diabetes or severe preeclampsia — can qualify. For accommodation rights that don’t depend on meeting the ADA’s disability threshold, the Pregnant Workers Fairness Act, effective 2023, requires covered employers to provide reasonable accommodations for known limitations related to pregnancy, childbirth, or related medical conditions, absent undue hardship.⁸

Having a Disability Isn’t Enough — You Also Have to Be Qualified

Meeting the definition gets you into the ADA’s protective framework, but you also need to be a “qualified individual” for the specific job. That means you can perform the essential functions of the position, either on your own or with a reasonable accommodation, and that you meet the job’s legitimate qualification standards for education, experience, skills, and licenses.⁹

Essential functions are the core duties the position exists to perform, not marginal tasks that take up a small fraction of the workday. Factors that help determine whether a duty is essential include whether the position exists specifically to perform that function, how many other employees are available to share it, and the degree of expertise it requires.⁹ An employer cannot pad a job description with requirements designed to screen out people with disabilities. The functions have to be genuinely necessary.

Which Employers Are Covered

The ADA’s employment protections apply to private employers, state governments, and local governments with 15 or more workers.¹ Smaller employers are outside its reach, though state laws sometimes fill that gap.

If you work for the federal government, your protections come from the Rehabilitation Act of 1973 instead, specifically Section 501. The practical effect is nearly identical: the Rehabilitation Act uses the same definition of disability as the ADA, prohibits discrimination and harassment based on disability, and requires agencies to provide reasonable accommodations absent undue hardship.¹⁰ The main procedural difference is the complaint process: federal employees generally must contact their agency’s EEO counselor within 45 days of the discriminatory event, rather than filing directly with the EEOC.¹¹

1
ADA.gov. Introduction to the Americans with Disabilities Act
2
Office of the Law Revision Counsel. 42 USC 12102 – Definition of Disability
3
U.S. Equal Employment Opportunity Commission. Disability Discrimination and Employment Decisions
4
U.S. Equal Employment Opportunity Commission. The Americans with Disabilities Act Amendments Act of 2008
5
Department of Justice. Questions and Answers – Final Rule Implementing the ADA Amendments Act of 2008
6
Office of the Law Revision Counsel. 42 USC 12114 – Illegal Use of Drugs and Alcohol
7
Office of the Law Revision Counsel. 42 USC 12211 – Definitions
8
U.S. Equal Employment Opportunity Commission. What You Should Know About the Pregnant Workers Fairness Act
9
U.S. Equal Employment Opportunity Commission. The ADA – Your Responsibilities as an Employer
10
U.S. Equal Employment Opportunity Commission. Employment Protections Under the Rehabilitation Act of 1973
11
U.S. Equal Employment Opportunity Commission. Time Limits For Filing A Charge