Incomplete vs. Insufficient FMLA Certifications

The Difference That Gets Employers Sued

A manager forwards you a medical certification and says the magic words every HR person dreads: "This isn't good enough — can we just deny it?"

Here's the trap. How you answer that question — and the word you put on the problem — decides whether you've handled the leave correctly or handed an employee a future interference claim. Because under the FMLA, "not good enough" splits into two very different categories with two very different obligations: incomplete and insufficient. Treat them as the same thing, or skip straight to denial, and you're exposed.

The distinction, in one breath

It comes down to whether the form has blanks or whether the form has fog.

• Incomplete: the certification comes back with one or more applicable entries simply not filled out. The provider left a required field blank.
• Insufficient: the entries are filled in, but the information is vague, ambiguous, or non-responsive. It's technically answered — it just doesn't actually tell you what you need to know.

"Patient may need time off occasionally" on a line asking for frequency and duration? That's not blank — it's insufficient. A frequency-and-duration line left empty entirely? That's incomplete. Same outcome on the manager's desk ("this is useless"), two different labels, and the label matters because it shapes the letter you have to send next.

What you cannot do: deny it

This is the part that trips up well-meaning HR teams. When a certification is incomplete or insufficient, you do not get to deny the leave. The regulations give the employee a chance to fix it first — and skipping that step is precisely the kind of move that turns a paperwork problem into an interference claim.

What you must do: the cure process

When you receive a certification that's incomplete or insufficient, two things are required of you:

• Tell the employee, in writing, exactly what's missing. Not "this is insufficient." Specifically: which entries are blank, or which answers are too vague and what would make them clear. Vagueness on your end is its own problem — if you can't name what's wrong, you can't expect the employee to fix it.
• Give them at least seven calendar days to cure it — unless that genuinely isn't practicable despite the employee's diligent, good-faith efforts. The clock is the employee's to beat; the deficiency is theirs to fix.

And note whose job the fixing is: it's the employee's responsibility to get the corrected certification back to you. You are not obligated to chase the provider for missing information — and you should be careful about going around the employee to do it.

The mistakes that actually get employers sued

• Denying outright instead of offering the cure period. The single most common — and most expensive — version.
• Being vague about the deficiency. "Insufficient" with no specifics doesn't give the employee a real chance to cure, which undercuts the whole process.
• Demanding more than the form is allowed to ask. The cure is about completing or clarifying what's required — not expanding the inquiry into territory the FMLA doesn't permit.
• Going straight to the provider for missing information rather than routing the cure through the employee. Authentication and clarification have their own narrow rules; gathering brand-new information isn't what they're for.

The takeaway

"Not good enough" is never a denial. It's a fork: name it incomplete or insufficient, write down precisely what's missing, start the seven-day clock, and put the fix in the employee's hands. Do that, and a shaky certification is just a Tuesday. Skip it, and you've built someone else's lawsuit.