FERS Disability Retirement Burden of Proof: What OPM Requires You to Show

What "Burden of Proof" Means in a FERS Disability Case

In a FERS disability appeal before the MSPB, the appellant bears the ultimate burden of establishing entitlement by a preponderance of the evidence. Under 5 CFR 1201.56, this means your claim is more likely true than not. OPM does not presume you're disabled. OPM does not give you the benefit of the doubt. You must affirmatively support each eligibility element.

The five elements you need to establish under 5 CFR § 844.103:

1. You have at least 18 months of creditable civilian service under FERS
2. You have a medical condition caused by disease or injury
3. That condition causes a deficiency in service performance, conduct, or attendance
4. The deficiency is expected to last at least one year
5. The agency could not accommodate you or reassign you to a vacant position at the same grade within commuting distance

Miss any one of these, and OPM denies. The denial letter will cite exactly which element it considers unproven.

How Much Evidence Is "Enough"

Preponderance of the evidence is the lowest standard in administrative law — lower than "clear and convincing" and far lower than "beyond a reasonable doubt." In practical terms, if the evidence tips even slightly in your favor, you've met the standard.

But OPM's medical officers routinely set the bar higher than the law requires. They demand imaging results for conditions diagnosed clinically. They dismiss treating physician opinions as "subjective." In Garland v. OPM (April 2026), the Federal Circuit held that when the Bruner presumption applies, OPM cannot meet its burden of production merely by pointing to a lack of objective clinical tests; competent medical evidence using established diagnostic criteria must be considered.

What actually meets the standard:

• Treating physician narratives that connect your diagnosed condition to specific duties in your position description — not generic statements like "patient cannot work"
• Functional capacity evaluations documenting what you can and cannot physically or cognitively do
• Treatment records showing the condition's duration and resistance to treatment
• Supervisor statements (SF-3112B) confirming attendance problems, performance deficiencies, or conduct issues linked to your condition
• Agency certification (SF-3112D) that accommodation was explored and found impossible

When the Burden Shifts: The Bruner Presumption

The burden of proof framework changes completely if your agency removed you for medical inability to perform. Under Bruner v. OPM, 996 F.2d 290 (Fed. Cir. 1993), an agency separation on medical grounds creates a prima facie case of disability entitlement. The burden of production then shifts to OPM — it must produce evidence that you're not entitled.

If OPM fails to produce that rebuttal evidence, the presumption controls and disability retirement must be granted. If OPM does produce rebuttal evidence, the presumption drops out and the case returns to the normal preponderance standard.

The Bruner presumption does not apply automatically to every separation. If your agency removed you for misconduct or performance and you later negotiated a settlement changing the separation code to "medical inability," OPM will not grant the presumption unless compelling medical evidence shows the original removal was erroneous and the agency was unaware of the disabling condition at the time of separation.

Check your SF-50 separation notice. If the removal action cites medical inability, you have Bruner on your side. Build your reconsideration brief around it.

Common Mistakes That Fail the Burden

The most frequent reason applicants lose is not insufficient medical evidence — it's evidence that doesn't connect to the right things. Your physician writes that you have severe lumbar degenerative disc disease. That's a diagnosis. It proves element two. But OPM wants to know how that condition prevents you from performing your specific position. If your position description requires lifting 50 pounds and your physician never mentions a lifting restriction, you haven't met the burden on element three.

Other common gaps:

• Duration ambiguity: Your physician says the condition is "chronic" but doesn't explicitly state it's expected to last at least one year. OPM reads silence as failure to prove duration.
• Missing accommodation evidence: Your agency never issued a formal accommodation denial. Without SF-3112D or equivalent documentation, element five goes unproven.
• Stale evidence: Records that do not show the condition's current impact can leave an evidentiary gap. Include updated treatment records when available.

Building a Case That Meets the Standard

If you've been denied, the denial letter tells you exactly where your evidence fell short. Map each deficiency to the five elements above. Then close each gap:

• For medical evidence gaps, get your treating physician to write a supplemental narrative letter that directly addresses OPM's specific objection — quoting the denial letter's language
• For agency documentation gaps, request the complete OPM claim file from Boyers, PA, to see what your agency actually submitted (or didn't submit) on the SF-3112 series
• For duration concerns, obtain updated treatment records showing the condition persists

You have 30 calendar days from OPM's initial denial to file a Request for Reconsideration under 5 CFR 841.306. That window is measured by OPM receipt, not postmark. Use certified mail or tracked delivery.

The FERS Disability Denial Appeal Guide walks through each element of the burden of proof with checklists for mapping denial reasons to evidence remedies, including templates for physician briefing letters and a denial-reason mapping worksheet.

The Burden at MSPB

If reconsideration fails and you appeal to the Merit Systems Protection Board, the same preponderance standard applies — but now you're in an adversarial proceeding with formal discovery, witness testimony, and an Administrative Judge weighing the evidence. The MSPB gives no deference to OPM's medical officer's opinion. The AJ evaluates all evidence independently.

At the MSPB level, the burden of proof can work in your favor. Unlike OPM's paper review, you can cross-examine OPM's medical consultant, submit live expert testimony, and present evidence OPM previously excluded. If you have the Bruner presumption, OPM must present its rebuttal evidence in a hearing where you can challenge it directly.

The standard doesn't change at MSPB, but the process gives you formal discovery, witness testimony, and an Administrative Judge who weighs the evidence independently.

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