Claim Raven explanation
What this means
This section sets out the requirements used for a diagnosis of chronic fatigue syndrome for VA purposes. It includes sustained disabling fatigue, exclusion of other clinical causes, and the specified accompanying findings.
Chronic fatigue is a symptom that can have different causes. It should not be treated as an automatic diagnosis of chronic fatigue syndrome, and the diagnosis rule is separate from the severity criteria used to assign a rating.
How this helps your claim
This helps you understand why a medical workup and an explanation of excluded causes can matter. Use the clinician's findings rather than trying to diagnose yourself from a checklist.
What to check in your records
Use your decision, examination reports, and relevant records to check the following points.
- Find the diagnosis and the history of fatigue and reduced activity.
- Review the medical evaluation of other possible causes.
- Compare the documented accompanying symptoms with the diagnosis requirements.
Keep fatigue symptoms separate from the diagnosis
Persistent fatigue can be associated with different medical conditions. This provision requires a defined clinical assessment for chronic fatigue syndrome, including consideration of other causes. A record describing tiredness does not necessarily establish that diagnosis.
A useful history describes the onset, duration, change from prior activity and accompanying symptoms accurately. Keep any investigations and alternative explanations in the record rather than omitting them. The diagnosis and the later evaluation of severity are separate steps under different provisions.
Should I assume unexplained fatigue is chronic fatigue syndrome?
No. Lack of an explanation in one note is not equivalent to completion of the diagnostic assessment. The regulation identifies required findings and exclusion of other clinical causes. Use the diagnosis actually supported by the clinical record and avoid changing treatment or withholding contrary information to fit it.
Official regulatory text
38 CFR § 4.88a
eCFR snapshot: September 3, 2026. Layout and spacing are adapted for reading. The full section and its tables are included below.
§ 4.88a Chronic fatigue syndrome.
(a) For VA purposes, the diagnosis of chronic fatigue syndrome requires:
(1) new onset of debilitating fatigue severe enough to reduce daily activity to less than 50 percent of the usual level for at least six months; and
(2) the exclusion, by history, physical examination, and laboratory tests, of all other clinical conditions that may produce similar symptoms; and
(3) six or more of the following:
(i) acute onset of the condition,
(ii) low grade fever,
(iii) nonexudative pharyngitis,
(iv) palpable or tender cervical or axillary lymph nodes,
(v) generalized muscle aches or weakness,
(vi) fatigue lasting 24 hours or longer after exercise,
(vii) headaches (of a type, severity, or pattern that is different from headaches in the pre-morbid state),
(viii) migratory joint pains,
(ix) neuropsychologic symptoms,
(x) sleep disturbance.
(b) [Reserved]
[59 FR 60902, Nov. 29, 1994]
Related references
- 38 CFR § 4.1: What a VA disability rating measures
- 38 CFR § 3.159: VA duty to assist: records and examinations
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