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Mary R. — Social Security denial reversed because the ALJ lacked expert evidence on mental limitations

Unreported / Non-Citable

Case
Mary R. v. Commissioner of Social Security
Court
U.S. District Court — Northern District of Texas
Judge
David L. Horan
Date Decided
August 31, 2026
Docket No.
4:25-cv-00985-BN
Topics
Social Security Disability, Residual Functional Capacity, Mental Impairments, Record Development

Background

Mary R. sought judicial review after the Commissioner of Social Security denied her claim for disability insurance benefits. She argued that the administrative law judge’s residual functional capacity determination was unsupported by substantial evidence because the ALJ failed to develop the record by obtaining a consultative examination. She also challenged the ALJ’s assessment of her credibility.

The state agency consultants did not assess Mary R.’s mental residual functional capacity. After their reviews, the record was supplemented with approximately 34 pages of mental-health treatment records, including an August 2024 visit at which she was diagnosed with anxiety and depression, screened in the severe range for depression, and was prescribed Lexapro. The ALJ nevertheless found her mental impairments non-severe, identified mild limitations in all four Paragraph B functional areas, and included no mental limitations in the residual functional capacity.

The Court’s Holding

The court reversed the Commissioner’s decision and remanded for further proceedings. It held that the record did not clearly establish how Mary R.’s mental impairments affected her ability to work and therefore did not contain substantial evidence supporting the ALJ’s mental residual functional capacity assessment.

The court explained that an ALJ has discretion over whether to order a consultative examination, but may not independently translate raw mental-health evidence into functional findings when no medical source has evaluated the relevant evidence or addressed the claimant’s work-related mental abilities. Because additional expert evidence might have supported greater limitations and changed the disability determination, the failure to develop the record was reversible error. The court did not separately resolve Mary R.’s credibility argument.

Key Takeaways

  • An ALJ need not order a consultative examination in every disability case, but the record must clearly establish how the claimant’s impairments affect the ability to work.
  • When later-submitted mental-health records have not been functionally assessed by a medical source, an ALJ may not rely solely on a lay interpretation of those records to formulate the residual functional capacity.
  • A failure to obtain needed expert evidence is prejudicial when that evidence might support additional limitations capable of changing the disability determination.

Why It Matters

The decision underscores that an ALJ’s authority to determine residual functional capacity does not permit the ALJ to act as a medical expert. When the record documents mental impairments but lacks professional evidence translating them into work-related limitations, further development may be required before benefits can be denied.

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