Sullivan v. Zebley (1990)

By: Layna Grassi

Overview 

Sullivan v. Zebley (1990) is a Supreme Court case in which the respondent, Brian Zebley, a child  denied Supplemental Security Income (SSI) disability benefits, argued on behalf of a class of  children that the federal government’s method for deciding child disability claims conflicted with  the Social Security Act. The petitioner, the Secretary of Health and Human Services, argued that  comparing a child’s medical evidence against a fixed list of impairments was the only way to  decide whether a child’s condition is comparable to one that would disable an adult. The main issue in this case was whether the Secretary’s listings only approach to child disability claims is  consistent with the statute’s requirement that children receive benefits for any impairment of  “comparable severity” to one that would disable an adult [1]. 

Summary 

Congress created the SSI program in 1972 to guarantee a minimum income for people who are  elderly, blind, or disabled, and it went into effect in 1974 [1]. The Court noted that the program  handles about 2,000,000 claims a year; roughly 100,000 of them are from children [1]. The  statute defines an adult as disabled if a medically determinable impairment prevents any  substantial gainful activity, and it treats a child as disabled if the child has an impairment of  “comparable severity” [1].

The Secretary set up a five-step test for adults. At the third step, an adult whose impairment  matches a list of conditions presumed severe enough to prevent any work wins benefits  automatically. An adult who does not match the list can still qualify at steps four and five by  showing that he cannot do his past work or any other work in the economy given his age,  education, and work experience. The test for children was shorter. A child who did not match or  was medically equal to a listed impairment was simply denied, with no further inquiry  resembling the adult test’s final steps [1]. 

Zebley, a child whose claim was denied, filed a class action in the Eastern District of  Pennsylvania challenging these regulations, and the district court certified a class of children  affected by the rules. The district court granted summary judgment for the Secretary. But the  Third Circuit vacated that ruling in part, finding the listings-only approach inconsistent with the  statute because it denied children the individualized functional assessment that adults receive.  The Supreme Court took the case to resolve a split among the circuits, since the First and  Eleventh Circuits had upheld the Secretary’s approach. 

In a 7-2 decision, Justice Harry Blackmun wrote for the Court and affirmed the Third Circuit.  Because the Social Security Act gives the Secretary rulemaking power, the Court applied the  deferential framework from Chevron, which asks whether the regulations exceed the agency’s  statutory authority or are manifestly contrary to the statute, and concluded that these regulations  failed that test [1]. The Court’s central point was that the listings are stricter than the statutory  standard. They describe impairments severe enough to prevent any gainful activity, not only substantial gainful activity. They also cover only the more common conditions, and the  equivalence analysis requires a claimant to match every criterion of a single listing. Adults who  fall through these gaps get a second chance at the vocational steps, but children get nothing, so children with impairments of “comparable severity” to ones that would disable an adult were  being denied benefits [1]. 

The Court also noted that the Secretary was treating child claimants the same as widows and  widowers under Title II. They did this even though Congress set a stricter standard for widows  and tied the child standard to the more liberal test used for other adults. It rejected the Secretary’s  argument that no alternative was practical, reasoning that a vocational analysis not applying to  children does not mean a functional analysis cannot apply. Asking how an impairment affects a  child’s daily activities, such as walking, dressing, going to school, and playing, is no more  unmanageable than asking how an adult’s impairment affects his ability to do any work in the  economy. The Court added that some of the Secretary’s own listings and his test for ending  benefits already use functional criteria [1]. Justice Byron White, joined by Chief Justice William  Rehnquist, dissented, arguing that “comparable severity” is ambiguous, that Congress gave the  Secretary broad authority, and that the regulations are not invalid on their face. In this view,  children with unlisted impairments should make their cases individually and seek court review if rejected. He also warned that requiring individualized determinations would burden an agency with  limited funds [1]. 

Impact 

This decision forced the Social Security Administration to stop denying child SSI claims based  solely on whether a medical listing was met. It required a case-by-case functional assessment of  how a child’s impairment affects the activities normal for a child of that age. The ruling  confirmed that the child disability standard is tied to the more liberal adult test and that  regulations cannot narrow what Congress wrote. It is also an example of the Court enforcing the statute’s text against an agency’s regulatory shortcut even under Chevron’s deferential review.  Congress later revised the childhood disability standard as part of the 1996 welfare reform law,  which replaced the comparable severity language and ended the individualized functional  assessment that Zebley had required. For that reason, the case is now studied mainly as a leading  example of how courts review agency interpretations of benefit statutes and of the tension  between agency efficiency and individualized treatment of claimants with disabilities. 

Court Documents 

Sullivan v. Zebley, 493 U.S. 521 (1990) 

Citations 

[1] “Sullivan v. Zebley, 493 U.S. 521 (1990).” Justia U.S. Supreme Court Center,  supreme.justia.com/cases/federal/us/493/521/. Accessed 13 Oct. 2026.