Chronic Fatigue Syndrome (ME/CFS) and SSDI
ME/CFS is recognized by the SSA under a specific ruling. The key is documenting post-exertional malaise and functional decline objectively.
What the SSA Looks For
ME/CFS is evaluated under Social Security Ruling 14-1p. The SSA requires a medically documented diagnosis meeting the Institute of Medicine criteria, including post-exertional malaise, unrefreshing sleep, and cognitive impairment or orthostatic intolerance.
Common Reasons Claims Are Denied
- No objective test confirms ME/CFS — SSA questions whether it is medically determinable
- Claimant appears functional on good days; bad days not documented
- Post-exertional malaise not quantified or clinically documented
- SSA overrelies on activities of daily living claimant can perform on good days
How to Strengthen Your Appeal
Two-day CPET (cardiopulmonary exercise testing) is the most objective way to document post-exertional malaise — performance significantly worsens on day 2, which is not seen in deconditioned individuals. Document orthostatic intolerance with tilt table test or NASA lean test. Document the push-crash cycle in medical records.
Key Medical Evidence Needed
- Physician diagnosis meeting IOM 2015 criteria
- Two-day CPET results if available
- Tilt table or NASA lean test for orthostatic intolerance
- Activity/symptom diary documenting post-exertional malaise
- Sleep study results if available
- Treating physician RFC addressing activity tolerance and recovery time
ME/CFS (Myalgic Encephalomyelitis/Chronic Fatigue Syndrome) is a complex, serious disease that can leave patients unable to perform even basic daily activities. The SSA formally recognized ME/CFS with SSR 14-1p in 2014, but claims remain difficult to win without strategic documentation.
Post-Exertional Malaise: The Defining Feature
PEM — the worsening of symptoms after physical or mental exertion — distinguishes ME/CFS from ordinary fatigue or depression. Document that your symptoms worsen 12–48 hours after activity and that rest is required for recovery. This prevents you from maintaining the consistent attendance and performance that employment requires.
The Good Day Trap
Many ME/CFS patients are denied because they report activities they can sometimes perform on good days. The SSA must evaluate your capacity across all days — including the crash days. Document the variability and unpredictability of your condition, and how the frequency of crash days makes sustained employment impossible.
Talk to a Disability Attorney — Free Consultation
SSDI attorneys work on contingency — you pay nothing unless you win, and fees are capped at 25% of back pay (maximum $9,200 in 2025). Most offer free initial consultations.
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