Do I need a diagnosis to get accommodations at work?

What the law asks for, which isn’t a diagnosis

Two jurisdictions are described here because they’re structured differently, and the difference is instructive. Neither is legal advice, and neither may be yours.

One framing to drop before going further: the useful distinction isn’t formal versus informal. It’s between a working preference that isn’t linked to a disability or medical condition, and a reasonable-accommodation or reasonable-adjustment request, which can itself be conversational, oral and plain-English. A form is not what creates the right.

In the US, the EEOC’s enforcement guidance on reasonable accommodation describes the trigger this way: the individual or their representative must let the employer know they need an adjustment or change at work for a reason related to a medical condition. The guidance adds that a person may use “plain English” and need not mention the ADA, the Americans with Disabilities Act, or use the phrase “reasonable accommodation.”

The examples it gives are ordinary sentences. Telling a supervisor you’re having trouble arriving at your scheduled start time because of medical treatment is a request. So is saying you need six weeks off to get treatment for a back problem. The guidance also draws the boundary: an employee asking for a new chair because the present one is uncomfortable is asking for a change at work, but without the connection to a medical condition it isn’t the same kind of request.

So the thing being asked for is a connection, not a label. You have to link a needed change to a medical condition. Naming which condition, in that first conversation, is a different act.

In the UK, section 6 of the Equality Act 2010 sets the definition: a person has a disability if they have a physical or mental impairment, and the impairment has a substantial and long-term adverse effect on their ability to carry out normal day-to-day activities. Nothing in that sentence is about documentation. It’s a test about what an impairment does to your daily life.

The duty that follows sits in section 20, which requires an employer to take such steps as it is reasonable to have to take to avoid a substantial disadvantage where a provision, criterion or practice puts a disabled person at one. Again, the trigger is the disadvantage, not a certificate.

Acas puts the diagnosis point beyond doubt, saying that for someone to be classed as having a disability it does not matter if they have not had a medical diagnosis, as long as they can still show a substantial and long-term adverse effect on their ability to carry out day-to-day activities. It adds that employers should not try to diagnose someone, since only a medical professional can do that, and should focus instead on the support they can provide.

There is a condition the statute’s bare definition doesn’t show, though. Acas states that employers must make reasonable adjustments when they know, or could reasonably be expected to know, that someone is disabled. So the duty isn’t triggered by the impairment alone; it’s triggered by the employer knowing, or reasonably being expected to know, about it and about the disadvantage. That’s the practical reason saying something matters, even where no paperwork does.

And there are limits on who’s covered. In the US, Title I makes it unlawful to discriminate against a qualified individual with a disability, and the provisions the EEOC enforces apply to employers with 15 or more employees. Federal employees and some other workers are covered through different or overlapping routes, and state or local law may go further. In the UK, Acas says the duty covers employees and workers, contractors and self-employed people hired to do the work personally, and job applicants. Neither system owes every requested change to everyone.

What “reasonable documentation” means

This is where the answer stops being a clean no, and it’s worth reading closely because the limits cut both ways.

US guidance says that when the disability or the need for accommodation is not obvious, the employer may ask for reasonable documentation about the disability and functional limitations. The employer, in the guidance’s words, is entitled to know that the individual has a covered disability for which they need an accommodation.

But “reasonable” is defined narrowly. The guidance says the employer may require only the documentation needed to establish that a person has an ADA disability and that the disability necessitates a reasonable accommodation. It says an employer cannot ask for documentation unrelated to determining those two things, and that in most situations an employer cannot request a person’s complete medical records, because those are likely to contain information about matters that aren’t relevant.

Read the shape of that. The employer can ask for evidence of an impairment and its effects. What they’re entitled to is bounded by the request you’ve made. Documentation about your functional limitations is a different thing from your diagnostic history, and the guidance treats it as a different thing.

Worth knowing in the other direction too: the same guidance notes that a letter can be insufficient. Its example is a doctor’s note saying an employee has asthma and needs an air filter, which the guidance says gives too little on severity and doesn’t identify what problem in the workplace requires the change. A diagnosis on letterhead, with nothing about effects or barriers, may not do the job you wanted it to do.

Asking without naming anything

A large amount of what people change about their working day never involves any of this.

Noise-cancelling headphones, a desk away from a walkway, written follow-ups after verbal briefings, agendas in advance, a camera-off norm on calls, moving a recurring meeting out of your worst hour: these are ordinary requests. An employer can agree to them, and mostly the conversation is about the work rather than about you.

A request framed purely as a working preference, with no link to a disability or medical condition, asks nothing of you diagnostically and engages no legal duty. That’s a genuine route and often the fastest one.

What it isn’t is the same thing as an informal conversation about a disability-related need. EEOC guidance calls the exchange that follows a request an “informal, interactive process”, and its own example of a request that doesn’t count is an employee asking for a more comfortable chair without linking it to a medical condition. The dividing line is the link, not the formality. A conversation that makes that link can be a legally operative request; a written form that doesn’t isn’t.

Keeping a record is still practically useful, because memories and managers change. It isn’t what creates the protection.

If what you’re stuck on is the wording rather than the entitlement, our accommodations builder drafts a request from the barriers you name, and lets you choose whether to name a diagnosis, describe your needs, or keep it general.

A 2025 systematic review of workplace accommodations for autistic employees found the accommodations reported in the literature fell into four groups: assistive technology; organisational, sensory and environmental adaptations; supervisory and relational support; and skills and psychosocial support. Its overall finding was that accommodations were linked to better job acquisition, stability, satisfaction and productivity, with effectiveness varying by relational quality, disclosure practice and organisational culture. It pooled ten studies published between 2010 and 2025, most with small samples and reliant on self-report, so read it as a map of what gets used rather than a measure of how well any of it works.

That “supervisory and relational support” category is worth noticing. A good deal of what helped, in the studies reviewed, wasn’t equipment or policy. It was a manager.

What happens after you ask

The US guidance describes a request as the start of something rather than a submission for judgment: a request for reasonable accommodation is the first step in an informal, interactive process between the individual and the employer.

That framing matters for the documentation question, because it locates where the question arises. The guidance notes that in some instances, before addressing the merits of the request, the employer needs to determine whether the person’s medical condition meets the ADA definition of disability, which is a prerequisite for being entitled to an accommodation. So the paperwork conversation isn’t the whole process. It’s a gate that appears at one point in it, and only when the disability or the need isn’t already obvious.

Two other details are worth knowing because people assume the opposite.

Someone else can ask on your behalf. The guidance says a family member, friend, health professional or other representative may request a reasonable accommodation for an individual with a disability. You aren’t required to be the one who raises it, which matters if you’re unwell or if the conversation is one you can’t face having.

Asking doesn’t oblige an employer to agree. The guidance is direct that while a person may request a change due to a medical condition, the request doesn’t necessarily mean the employer is required to provide that change. What the request does is start the process and put the employer on notice.

It also notes that where neither you nor the employer knows what would help, extensive public and private resources exist to identify options once the specific limitations and workplace barriers have been worked out. Not knowing what to ask for isn’t a reason to say nothing.

What a diagnosis does buy you

Not a guarantee, and not the adjustment itself. What it can do is make one part of the test easier to establish.

Where a request is disputed, where a covered employer asks for documentation because the need isn’t obvious, or where you may need to escalate, the question becomes whether you meet the legal definition where you are. A diagnosis is one way of evidencing an impairment and its effects. It isn’t automatically sufficient, as the air-filter example shows, and in the UK it isn’t necessary. What tends to carry weight in either system is a description of effects and workplace barriers, which is what both the EEOC’s documentation standard and the Equality Act’s definition are asking about.

It’s also worth being clear about what it doesn’t buy. A diagnosis doesn’t oblige an employer to give you the specific change you asked for, and it doesn’t stop a colleague forming an opinion. Those are separate problems with separate answers.

If assessment is out of reach

If assessment is unaffordable, unavailable or delayed, you can still describe the barrier and ask for a change. That closes off one route, not all of them. The accommodations builder is built for exactly that position: it works from what’s hard and what would help, with naming a diagnosis as an option rather than a requirement.

The route that doesn’t require establishing anything stays fully open. Describing the barrier and the change you want is something you can do today, in your own words, without establishing anything about yourself.

Where you’re heading toward a formal process, the question worth asking early is what your employer and jurisdiction require, because it may be less than you assume and it may be satisfied by something short of a full assessment. An occupational health referral, a letter from a GP describing effects rather than naming a condition, or an existing record from another service may carry weight depending on the system. That’s a question for whoever administers the process where you are, or for an employment adviser, a union representative or a disability rights organisation in your country.

The thing not to do is conclude that no diagnosis means no options. The legal definitions quoted on this page are about impairments and their effects on your day. The paperwork is a way of demonstrating that, not the thing itself.