Can an Employer Require a Doctor’s Note for Intermittent FMLA?

Yes. An employer can require a doctor’s note for intermittent FMLA leave, and the Family and Medical Leave Act regulations lay out in detail what that note must contain, how quickly you have to produce it, and how often the employer can ask for an updated one. The same rules cap what the employer can demand, so the certification process is a two-way street with real limits on both sides.

What the Doctor’s Note Has to Say

The formal name for the doctor’s note is a medical certification. When you first request intermittent FMLA leave, your employer can require your healthcare provider to complete one, and the certification has to cover specific ground tied to intermittent use.¹

For your own condition, the provider must confirm the approximate start date and expected duration, describe enough medical facts to support the need for leave, and explain why you cannot perform the essential functions of your job. Because the leave is intermittent rather than continuous, the certification must also establish that a non-continuous schedule is medically necessary and estimate how often episodes will occur and how long each is likely to last.¹

The Department of Labor publishes optional forms for this — WH-380-E for your own serious health condition and WH-380-F for leave to care for a family member. Employers may use their own forms as long as they ask for the same categories of information.² What the employer cannot do is demand your full medical records or a specific diagnosis beyond what the certification calls for. The purpose is to confirm the condition exists and that intermittent leave is medically necessary, not to open a window into your medical history.

Deadlines for the Request and the Return

Your employer should request the certification at the time you give notice of the need for leave, or within five business days after. You then have 15 calendar days to return the completed form, unless circumstances genuinely prevent it despite a good-faith effort on your part.³

Miss the deadline without a legitimate reason and you risk losing the leave protection entirely, so treat the 15 days as a hard clock. If your provider is slow to complete the form, document your efforts to get it done.

If the Certification Is Incomplete or Insufficient

A returned form with blank fields is “incomplete.” One that’s filled out but vague or non-responsive is “insufficient.” In either case, the employer must tell you in writing exactly what’s missing or unclear, and you get seven calendar days to fix the problem.³

If you don’t cure the deficiencies within that window, or never return a certification at all, the employer can deny FMLA leave outright. The consequence is steep, which is why the employer has to warn you up front about what will happen if you don’t provide certification.³ Ignoring an incomplete-certification notice is one of the fastest ways employees lose leave they were otherwise entitled to.

How Often Can the Employer Ask for a New Note?

Once you’re on ongoing intermittent leave, the employer can ask for updated certification, called recertification, but only on a limited schedule. The baseline rule: no more than every 30 days, and only in connection with an actual absence.⁴

If your original certification states a minimum duration longer than 30 days — say the provider estimated 40 days — the employer must wait until that period ends before asking for recertification. For chronic or lifetime conditions, however, the employer can always request recertification every six months in connection with an absence. That six-month floor is the main tool employers use to periodically re-verify long-term intermittent leave.⁴

The employer can also request recertification sooner than the normal interval if it receives information casting doubt on the stated reason for an absence or on the continued validity of the certification. A pattern of Monday and Friday absences, for example, or information suggesting the condition has changed, can support an early request.⁴

Two things separate recertification from the initial certification. Recertification is at your expense unless the employer’s policy says otherwise. And the employer cannot demand second or third opinions on a recertification — it has to accept the updated note on its face.⁴

Second and Third Opinions on the Initial Certification

If the employer has reason to doubt the validity of the initial certification, it can require you to see a different healthcare provider for a second opinion. The employer picks the provider and pays for the visit. While you wait for the second opinion, you’re provisionally entitled to FMLA leave and benefits.⁵

If the second opinion conflicts with the first, the employer can require a third opinion, again at the employer’s expense. The third provider must be chosen jointly by you and the employer, with both sides negotiating in good faith. That third opinion is final and binding.⁵

Who Can Contact Your Doctor

Employers sometimes need to verify that a certification was actually completed by the provider who signed it, or to clarify illegible handwriting. The regulations allow that kind of contact, with a hard limit: your direct supervisor may never contact your healthcare provider. Only an HR professional, a leave administrator, a management official, or the employer’s own healthcare provider can make the call.⁵

Even then, the contact is confined to authentication and clarification. The employer cannot use the call to fish for additional medical information beyond what the certification already contains.⁵

Fitness-for-Duty Notes for Intermittent Leave

A fitness-for-duty certification is a separate document confirming you can safely return to work. For continuous FMLA leave, employers can require one before letting you back. For intermittent leave, the rule is stricter: the employer cannot require a fitness-for-duty note for every absence.⁶

The exception is when reasonable safety concerns exist, meaning a genuine, fact-based belief that your condition creates a significant risk of harm to you or others. In that case, the employer can require a fitness-for-duty certification up to once every 30 days. The employer must have flagged this requirement in the designation notice before your intermittent leave began, and cannot fire you while waiting for the certification to come back.⁶

When an Employer Oversteps

If your employer denies valid leave, retaliates, or pushes documentation demands beyond what the regulations allow, you have two enforcement paths.

The first is a complaint to the Department of Labor’s Wage and Hour Division, which investigates FMLA violations. Complaints are confidential, and the employer cannot retaliate against you for filing one. If the investigation finds a violation, the agency can require corrective action such as reinstatement or back pay.⁷

The second is a private lawsuit. Under the FMLA’s enforcement provision, you can sue for lost wages, salary, benefits, and other compensation denied because of the violation, plus interest. For willful violations, the court can award liquidated damages equal to that total, effectively doubling recovery. Attorney’s fees and court costs are also recoverable.⁸

The deadline to sue is two years from the last alleged violation, or three years if the violation was willful.⁹

1
eCFR. 29 CFR 825.306 – Content of Medical Certification
2
U.S. Department of Labor. FMLA Forms
3
eCFR. 29 CFR 825.305 – Certification, General Rule
4
eCFR. 29 CFR 825.308 – Recertifications
5
eCFR. 29 CFR 825.307 – Authentication and Clarification of Medical Certification
6
eCFR. 29 CFR 825.312 – Fitness-for-Duty Certification
7
U.S. Department of Labor. How to File a Complaint
8
Office of the Law Revision Counsel. 29 USC 2617 – Enforcement
9
U.S. Department of Labor. elaws – Family and Medical Leave Act Advisor – Enforcement of the FMLA