Can an Employer Deny a Doctor's Note?

Three kinds of law can cover an absence: the FMLA, the ADA, and state or local sick-leave laws. None of them cover everything, and they don't work the same way.

The FMLA protects job-protected leave for your own serious health condition, or that of a spouse, child, parent, or another qualifying family member, once you and your employer both qualify and the leave is properly requested and certified. Once that's true, your employer can't use it against you: not counted under a no-fault attendance policy, not treated as a factor in discipline.

The FMLA only reaches you if your employer is covered and you are eligible. Broadly: at least 50 employees within 75 miles of your worksite, 12 months on the job, and at least 1,250 hours of service in the 12 months before the leave. That last one is a little over 24 hours a week actually worked, and paid time off generally doesn't count toward it.

The ADA works differently. A note asking for a change at work because of a medical condition is a request for a reasonable accommodation, not an instruction your employer has to carry out as written. The employer has to engage with it. It does not have to say yes. Leave itself can sometimes be the accommodation, including where FMLA leave has run out or never applied — that is covered in our guide to ADA leave.

Some states and cities have their own sick-leave laws, with their own coverage rules. Whether one of them reaches you depends on local law, which this page does not try to sort out for you.

Those are the three that come up most. They are not the whole of the law: pregnancy-related restrictions fall under the Pregnant Workers Fairness Act, in effect since 2023, and some states run their own family-leave programs alongside the federal one. If none of it applies to your situation, there's no law compelling your employer to accept the note. Its own attendance and call-in policy is what applies, paperwork or not.

A denial is not necessarily a judgment that your evidence was false. Under the FMLA, a certification can be turned down for being incomplete or insufficient, and that particular refusal comes with a right to fix it.

Under the FMLA, incomplete means an entry on the certification was left blank. Insufficient means the information given was vague, ambiguous, or didn't actually answer what the form asked. Either one triggers a specific process: the employer has to tell you, in writing, what's missing, and give you generally seven calendar days to provide it.

There's time on the front end too. When a certification is first requested, you normally have 15 calendar days to return it.

Miss the deadline and the days you were out in the meantime can lose their protection, even if you hand the paperwork in later. A certification that's never sent back at all counts as no certification provided, and the leave is not FMLA leave.

So before anything else: read the denial again. Does it actually say what was missing? If it doesn't, that's worth pushing on directly. You may still be inside your window to fix it.

The same gap shows up outside any certification process. A note with no clear date range, no specific statement of what the evaluation concluded, and nothing an employer can check gives that employer an easy reason to set it aside. A note completed and signed by a state-licensed provider, with the dates and the specifics spelled out, does not leave that gap. It cannot make an employer accept an absence no law protects. It removes the easiest reason to set one aside.

If a provider already wrote you a note, start there. Ask them to complete the missing item or reissue it with the dates and specifics spelled out. That is usually faster and cheaper than starting over, and it keeps the document with the clinician who actually evaluated you.

One distinction worth being clear about. An FMLA certification is the specific paperwork your employer requests for FMLA leave, and it is a different document from an ordinary sick note. If what you were handed is a certification, that is the paperwork that needs completing, and it starts on our medical leave and FMLA paperwork page. If what you need is a straightforward note for an absence, that is what follows.

If the absence is protected (properly requested and certified FMLA leave, for instance), they can't discipline you for that absence. Your employer can't treat that leave as a mark against you.

Protection is narrower than it sounds, though. It stops the leave being used against you. It doesn't freeze everything else: an employer can still act for reasons that have nothing to do with the leave, and it carries the burden of showing that's what happened. It can't factor into hiring, promotion, or discipline decisions, and it can't be counted under a no-fault attendance point system.

Discouraging you from taking protected leave counts as interference too, even short of an outright refusal. Retaliating against you for pushing back on any of this, asking questions, raising a complaint, is its own separate violation.

If the absence isn't protected, though, having a note doesn't change what the attendance policy allows. An employer that disciplines you for an absence no law covers, even with a note in hand, is generally acting within its rights.

What it can do: document that a state-licensed provider evaluated you, and record what that evaluation found, for whatever period it covers.

What it can't do: force your employer to accept an absence a law doesn't already protect, or override its own attendance policy on its own authority.

Under the FMLA, employers have a limited process for handling a certification, and it is worth knowing even if your situation is smaller than that. They can contact your provider to authenticate it (confirm it was actually completed and signed) or to clarify a specific answer or bit of handwriting. That contact has to come from HR, a leave administrator, or a management official. Your direct supervisor isn't allowed to make it. And your employer can't ask your provider for anything beyond what the certification form itself requires.

If there's real reason to doubt the certification, your employer can require a second opinion, at its own expense — and you stay provisionally entitled to the leave while that's pending. If the two opinions disagree, a third opinion, also at the employer's expense, settles it and is binding on both sides.

Start with the denial itself. If it doesn't say, in writing, what was missing or insufficient, ask for that in writing.

If nobody responded at all, put the question in writing to whoever handles leave or attendance: confirm they received the note, and ask what they have decided. Silence is not a decision, and a dated message asking for one is the record you will want later.

If your employer used FMLA leave against you in a hiring, promotion, or discipline decision — or denied or discouraged the leave in the first place — that's a Department of Labor matter. You can file a complaint with the DOL's Wage and Hour Division. Separately, an FMLA lawsuit generally has to be brought within two years of the last event in the violation, or three years if the violation was willful.

If the issue is discrimination tied to a disability — a refused accommodation, or punishment for asking for one — that's a separate claim, handled by the EEOC. An EEOC charge is generally due within 180 days, or 300 days where a state or local agency enforces the same protection. Federal employees work to a different clock and should contact their agency's EEO counsellor within 45 days.

These are two different claims, filed with two different agencies. Don't file the FMLA claim where the ADA claim belongs, or the reverse.

None of that requires a lawyer to start. It helps to have a clear record: what you were told, when, and in writing where you can get it.

Everything above is about absences. If your note instead asks for a change at work (modified duty, a different schedule), that's an accommodation request, and it runs on a different process: an interactive conversation, not an automatic yes.

What your employer can and can't do with that restriction is covered here: When your employer can't accommodate your restriction.