Whether an adult claimant’s qualifying IQ score may serve as prima facie evidence that significantly subaverage intellectual functioning began before age twenty-two under Listing § 12.05.
Holding
Yes. Absent evidence that a later event such as trauma or disease caused the cognitive limitation, a qualifying adult IQ score is prima facie evidence that the claimant’s qualifying intellectual deficits existed before age twenty-two.
Reasoning
Listing § 12.05 requires that intellectual disability initially manifest during the developmental period, before age twenty-two. The court joined the majority view among the circuits that intellectual functioning is generally stable over time. Thus, unless contrary evidence suggests that an adult-onset event reduced the claimant’s cognitive capacity, an adult IQ score in the qualifying range supports an inference that the same intellectual limitation existed before age twenty-two.
This presumption fits the regulation’s purpose. The age-of-onset requirement distinguishes an innate intellectual disability from cognitive limitations caused by disease, injury, or another event in adulthood. Treating adult IQ evidence as prima facie evidence of earlier deficits respects that distinction while allowing contrary evidence to rebut the inference.
The rule also avoids an unreasonable evidentiary barrier. Many adults with genuine intellectual disabilities will never have received IQ testing as children, and requiring a contemporaneous childhood test would make proof exceptionally difficult. Talavera’s qualifying adult IQ scores therefore met her initial burden on the onset of significantly subaverage intellectual functioning.