An FMLA letter from a doctor is a medical certification that tells your employer you have a serious health condition and need time off, and federal regulations spell out what it has to say. The core requirements are three: when the condition started and how long it will last, the medical facts that support the need for leave, and, if the leave is for your own condition, a statement that you can’t perform your essential job duties.1eCFR. 29 CFR 825.306 – Content of Medical Certification Get those elements in writing, submit within 15 days, and your job is protected while you recover.
What the Letter Has to Say
Your provider can either fill out the Department of Labor’s standard forms (WH-380-E for your own condition, WH-380-F for a family member’s) or write the certification on office letterhead. The forms are optional, but they exist because they prompt the provider to hit every required data point.2U.S. Department of Labor. FMLA Forms A letter that skips any required element will come back to you for correction.
At a minimum, the certification must include:
- The date the serious health condition began and the expected duration.1eCFR. 29 CFR 825.306 – Content of Medical Certification
- Relevant medical facts: symptoms, hospitalizations, doctor visits, prescribed medications, referrals, or any ongoing care regimen that supports the need for leave.1eCFR. 29 CFR 825.306 – Content of Medical Certification
- For leave taken for your own condition, a statement that you are unable to perform the essential functions of your job, plus any work restrictions and how long they’re expected to last. Your employer can give your doctor a list of your essential duties to inform this assessment.1eCFR. 29 CFR 825.306 – Content of Medical Certification
If the Leave Is Intermittent or on a Reduced Schedule
Leave that isn’t taken in one continuous block needs more detail. For planned medical treatments such as chemotherapy or physical therapy, the doctor must explain why intermittent leave is medically necessary and estimate the dates, the duration of each treatment, and any recovery periods.1eCFR. 29 CFR 825.306 – Content of Medical Certification
For conditions that cause unpredictable flare-ups, the letter needs an estimate of how often episodes are likely to occur and how long each one will probably last.1eCFR. 29 CFR 825.306 – Content of Medical Certification These estimates don’t have to be exact, but they need to be grounded in your medical history. Vague language like “as needed” with no frequency estimate is exactly what gets a certification kicked back as insufficient.
Does the Doctor Have to Write Down a Diagnosis
No. The DOL has said directly that a certification “does not need to provide the patient’s diagnosis but does need to state appropriate medical facts that indicate the employee needs leave.”3U.S. Department of Labor. Information for Health Care Providers to Complete a Certification of a Serious Health Condition Your doctor may choose to write one in, but it’s voluntary. If you’d rather keep the specific condition private, the provider can describe symptoms, treatment, and the reason you need time off without naming it.
Which Providers Can Sign It
You don’t need your primary care physician specifically. Federal regulations define “health care provider” broadly. Doctors of medicine and osteopathy are the obvious choice, but podiatrists, dentists, clinical psychologists, and optometrists also qualify.4eCFR. 29 CFR 825.125 – Definition of Health Care Provider Chiropractors can sign only for spinal conditions where they’re performing manual manipulation to correct a subluxation confirmed by X-ray.
Nurse practitioners, nurse-midwives, clinical social workers, and physician assistants can also complete the certification, as long as they’re working within the scope of their state license.4eCFR. 29 CFR 825.125 – Definition of Health Care Provider Whichever licensed provider is actually managing your condition is almost certainly authorized to sign the form. You don’t need a separate appointment somewhere else just for the paperwork.
Providers practicing outside the United States can also certify FMLA leave. If the document is in another language, your employer can require a written English translation.5U.S. Department of Labor. Fact Sheet 28G – Medical Certification Under the Family and Medical Leave Act
The 15-Day Deadline for Turning It In
Once your employer requests certification, you have 15 calendar days to return it.6eCFR. 29 CFR 825.313 – Failure to Provide Certification The clock starts on the day the employer asks, not the day your doctor finishes the form. More time is available when circumstances genuinely prevent you from meeting the deadline despite diligent efforts.
Missing the window without a good reason has real consequences. For foreseeable leave, the employer can deny FMLA protection until the certification arrives. For unforeseeable leave, the employer can deny coverage for the entire absence.6eCFR. 29 CFR 825.313 – Failure to Provide Certification Never producing the certification at all means the time off isn’t FMLA leave, and your job protection for those days evaporates. This is the trap people fall into: they assume the leave is covered because they told their supervisor about the medical issue, and then discipline shows up weeks later for unexcused absences.
Use a delivery method that creates a record. Hand delivery with a signed acknowledgment, certified mail, or your HR department’s secure upload portal all work. Save the timestamp.
One related timing rule worth knowing: your employer has to notify you of your FMLA eligibility within five business days of when you request leave or when the employer learns your absence may qualify, and that notice tells you whether a certification is required.7eCFR. 29 CFR 825.300 – Employer Notice Requirements An employer that never asks for a certification cannot later deny your leave for failing to provide one.
If Your Employer Says the Letter Isn’t Good Enough
A certification with blanks or vague answers is not an automatic denial. Your employer has to tell you in writing exactly what’s wrong and give you seven calendar days to fix it.8eCFR. 29 CFR 825.305 – Certification, General Rule Employers sometimes reject certifications without saying what’s needed. That isn’t permitted.
The regulations distinguish “incomplete” from “insufficient.” Incomplete means required fields were left blank. Insufficient means the entries are filled in but they’re vague, ambiguous, or non-responsive.8eCFR. 29 CFR 825.305 – Certification, General Rule A doctor writing “patient has medical condition requiring leave” with no supporting facts is the classic insufficient answer: technically responsive, actually useless.
Miss the seven-day cure window and the employer can deny leave. Call your provider the day the written notice arrives; don’t wait for your next scheduled visit.
Recertification: When You’ll Be Asked Again
The initial certification doesn’t cover you forever. Your employer can request a new one, but no more often than every 30 days, and only in connection with an actual absence.9eCFR. 29 CFR 825.308 – Recertification
If your doctor’s original letter states that the condition will last longer than 30 days, the employer has to wait until that stated duration expires before asking again. A certification predicting 40 days of intermittent leave means no recertification request until day 40.9eCFR. 29 CFR 825.308 – Recertification For long-term or lifetime conditions, the employer can still ask every six months in connection with an absence.
Recertification can be requested sooner if you ask to extend your leave beyond what was originally certified, if your absences are significantly more frequent or longer than the certification estimated, or if the employer receives information that casts doubt on the original certification.9eCFR. 29 CFR 825.308 – Recertification You get the same 15 calendar days to return the new letter.
Second and Third Opinions
Even a complete certification can be challenged. If your employer has reason to doubt the validity of your doctor’s findings, they can require you to see a second provider.10eCFR. 29 CFR 825.307 – Second and Third Opinions The employer picks and pays for that provider, and it can’t be someone the employer regularly employs or retains.
If the second opinion conflicts with the first, either side can push for a third. You and the employer jointly agree on the third provider, and that opinion is final and binding on both of you. The employer pays for both the second and third evaluations.10eCFR. 29 CFR 825.307 – Second and Third Opinions
While the process plays out, you are provisionally entitled to full FMLA benefits, including group health insurance.11eCFR. 29 CFR 825.307 – Second and Third Opinions Your employer can’t strip protections while waiting for another doctor’s opinion.
Limits on Employer Contact With Your Doctor
Your employer’s ability to reach out to your provider is narrow. They can contact the doctor only to authenticate the certification or clarify what it says. They cannot use the call to fish for medical information beyond what’s on the form.11eCFR. 29 CFR 825.307 – Second and Third Opinions
Your direct supervisor is never allowed to contact your health care provider, for any reason. Only an HR professional, a leave administrator, a management official outside your reporting chain, or another health care provider acting for the employer may make that contact.11eCFR. 29 CFR 825.307 – Second and Third Opinions A supervisor who calls your doctor is committing a regulatory violation worth documenting in writing.
HIPAA adds another layer. Your provider can’t release protected health information to your employer without your written authorization. If the employer wants to communicate directly with the doctor instead of going through you, they’ll need a HIPAA-compliant release signed by you. You always have the option to gather the information yourself and pass it along, which sidesteps the authorization question. When the leave involves a family member’s condition, that family member has to authorize any release of their own information.
The GINA Warning on the Form
The DOL’s official certification forms include a paragraph telling your doctor not to provide genetic information. The Genetic Information Nondiscrimination Act bars employers from requesting or collecting family medical history or genetic test results. The warning gives employers who use the forms a legal safe harbor: if the doctor includes genetic information anyway, the employer’s receipt of it counts as inadvertent.2U.S. Department of Labor. FMLA Forms
If your provider writes the certification on their own letterhead instead of using the DOL form, remind them to leave out family medical history and any genetic testing results. The letter should stay focused on your condition and what treatment it requires.