Harmless Diagnostic Mislabeling and Time‑Window Limits on New Evidence in SSA Appeals: Kavanaugh v. Commissioner (11th Cir. 2025)

Court: U.S. Court of Appeals for the Eleventh Circuit (Non‑Argument Calendar, Not for Publication)

Date: October 17, 2025

Case: Jennifer Lynn Kavanaugh v. Commissioner, Social Security Administration, No. 25‑10262

Introduction

This unpublished Eleventh Circuit decision affirms the denial of Supplemental Security Income (SSI) to a pro se claimant, Jennifer Kavanaugh. The case addresses three recurring themes in Social Security disability litigation: (1) the Administrative Law Judge’s (ALJ’s) duty to develop a full and fair record, especially when the claimant is unrepresented; (2) the reach of the harmless error doctrine where an ALJ’s decision contains minor factual inaccuracies about a claimant’s diagnoses; and (3) the strict temporal boundaries that govern whether “new evidence” can justify a remand under 42 U.S.C. § 405(g).

Kavanaugh alleged disability primarily due to palmoplantar psoriasis and psoriatic arthritis, reporting pain and functional limitations in her hands and feet. After initial denial and reconsideration by state agency consultants, she received an unfavorable decision from the ALJ. The Appeals Council denied review, and the district court affirmed. On appeal, Kavanaugh argued: (i) the SSA lacked complete medical records, (ii) the ALJ’s decision included harmful errors about her diagnoses and their locations, and (iii) additional evidence submitted in district court warranted a remand. She also objected to typographical errors in the magistrate judge’s initial report and raised new constitutional and tort claims.

The Eleventh Circuit affirms, clarifying that minor diagnostic mislabeling is harmless absent prejudice to the claimant’s substantial rights and that evidence postdating the ALJ’s decision is generally not “material” to the relevant adjudicatory period for sentence‑six remand purposes.

Summary of the Opinion

Standard of review and scope: The court reviews the Commissioner’s decision for substantial evidence and legal conclusions de novo. Where the Appeals Council denies review, the ALJ’s decision is the Commissioner’s final decision. The court does not review alleged errors by the district court for purposes of reversing the agency decision.
No evidentiary gap: The record reflected that the ALJ and Appeals Council had the relevant medical records, including those from December 2020–March 2021 (Dr. Chappell) and June 2021–April 2024 (PA Moore, as relevant to the Appeals Council’s consideration). No “evidentiary gap” justifying remand was shown.
Harmless error controls mislabeling: The ALJ’s reference to eczema and “rheumatoid arthritis” (instead of psoriatic arthritis) was, at most, harmless error. The inclusion of eczema as a severe impairment would have bolstered, not harmed, the claim, and the arthritis labeling did not affect the ALJ’s step‑three analysis or the ultimate non‑disability finding.
New evidence must relate to the relevant time period: Evidence submitted in the district court—letters and treatment notes from 2024—postdated the ALJ’s August 11, 2023 decision and was not material to the adjudicated period. Remand under § 405(g) was therefore unwarranted. If a claimant’s condition deteriorates after the final decision, the remedy is to file a new application.
Forfeiture and immaterial objections: New constitutional and emotional‑distress arguments not raised below were forfeited. Typographical errors in a magistrate judge’s initial report were irrelevant to the appellate review of the agency decision, particularly where corrected promptly.

Holding: The ALJ’s decision was supported by substantial evidence, any inaccuracies were harmless, and the new evidence did not justify remand. The denial of benefits was affirmed.

Analysis

Precedents Cited and Their Influence

Moore v. Barnhart, 405 F.3d 1208 (11th Cir. 2005): Establishes the standard of review—substantial evidence for factual findings and de novo review for legal conclusions. The court applies this framework to the ALJ’s findings here.
Lewis v. Callahan, 125 F.3d 1436 (11th Cir. 1997): Defines substantial evidence as “more than a scintilla” and what a reasonable person would accept as adequate. This anchors the appellate court’s deferential review of the ALJ’s fact‑finding.
Henry v. Commissioner of Social Security, 802 F.3d 1264 (11th Cir. 2015): When the Appeals Council denies review, the ALJ’s decision becomes the final decision of the Commissioner. This means the Eleventh Circuit directly reviews the ALJ decision rather than the district court’s reasoning—foreclosing reversal based on district court typographical errors.
Shinseki v. Sanders, 556 U.S. 396 (2009): Articulates the harmless error doctrine. The Eleventh Circuit invokes this doctrine to hold that misidentifying eczema and the type of arthritis does not warrant reversal where it did not prejudice the claimant or alter the outcome.
Diorio v. Heckler, 721 F.2d 726 (11th Cir. 1983): Applies harmless error in the Social Security context; not every factual mistake compels remand. The court relies on Diorio to avoid elevating minor inaccuracies over substance.
Hunter v. Social Security Administration, Commissioner, 808 F.3d 818 (11th Cir. 2015) (citing Caulder v. Bowen, 791 F.2d 872 (11th Cir. 1986)): Sets the three‑part test for sentence‑six remands under 42 U.S.C. § 405(g): (1) new and noncumulative, (2) material with a reasonable possibility of changing the outcome, and (3) good cause for not previously submitting it. The court resolves materiality against Kavanaugh because the evidence postdated the ALJ’s decision.
Wilson v. Apfel, 179 F.3d 1276 (11th Cir. 1999): Emphasizes that new evidence must be probative of the relevant time period. Evidence reflecting later deterioration is not material to the earlier adjudicated period; the remedy is a new application.
Flowers v. Commissioner, Social Security Administration, 97 F.4th 1300 (11th Cir. 2024): Explains forfeiture of arguments not raised before the agency or district court absent extraordinary circumstances. The court uses Flowers to decline consideration of new constitutional and tort arguments.
20 C.F.R. § 416.920(a): Governs the five‑step sequential evaluation, which the ALJ correctly applied to reach the non‑disability determination.

Legal Reasoning

1) Alleged Missing Records and the ALJ’s Duty to Develop the Record

Kavanaugh repeatedly asserted that the ALJ lacked key medical records, including certain dermatology and physician assistant notes. The Eleventh Circuit undertook a detailed review and found that the ALJ had the December 2020–March 2021 records (Dr. Chappell) and, by the time of the Appeals Council decision, the agency had the Moore records. Correspondence in July 2023 reflected the hearing office’s efforts to obtain completeness.

Because the record did not reveal “evidentiary gaps which result in unfairness or clear prejudice,” the predicate for remand on due‑development grounds was lacking. The court thus enforced the principle that while an ALJ must develop a full and fair record—particularly with a pro se claimant—remand is appropriate only where a concrete gap causes prejudice to the claimant’s substantial rights.

2) Harmless Error and Diagnostic Mislabeling

The ALJ listed “psoriasis and eczema” as severe impairments and elsewhere referenced “rheumatoid arthritis,” whereas Kavanaugh alleged psoriatic arthritis. The court treated these as, at most, minor factual inaccuracies and analyzed whether they affected the outcome.

Eczema as a severe impairment: Even if incorrect, including eczema as severe could only have helped the claimant; it did not prejudice her. Harmless error applies.
“Rheumatoid” vs. “psoriatic” arthritis: The court emphasized substance over labels. At step three, the ALJ evaluated whether the claimant’s symptoms met or equaled the listings for inflammatory arthritis and related conditions, noting the absence of required clinical signs such as inflammation, deformity, ankylosing spondylitis, spondyloarthropathies, or repeated manifestations with the requisite criteria. Thus, the misnomer did not skew the legal analysis or the conclusions. Harmless error again governs.

This application of Sanders and Diorio reinforces that reversal requires showing how an error affected the ultimate decision or impaired substantial rights, not merely that an error occurred.

3) New Evidence and the Relevant Time Window

Kavanaugh submitted additional evidence in the district court, including 2024 treatment records from “Lake City Chiropractic” listing “Andrew Payne” as provider, a partially completed Georgia DHS medical form labeling “Dr. Andrew Payne” as the provider for diagnoses such as cervical and lumbar spondylosis, and a letter from PA Jodi‑Ann Moore (Southeast Dermatology Specialists) dated November 12, 2024 stating she had treated Kavanaugh from June 2021 to April 2024 for plaque psoriasis and psoriatic arthritis.

For a sentence‑six remand under § 405(g), new evidence must be material to the period adjudicated by the ALJ—in this case, up to August 11, 2023. The Eleventh Circuit concluded that the 2024 records postdated the ALJ decision and therefore were not probative of the relevant period, citing Wilson v. Apfel. While the evidence might speak to deterioration after August 2023, it could not retroactively establish disability during the adjudicated period. The appropriate course, the court observed, is to file a new application if the condition worsened after the final decision.

Notably, although the court observed practical issues with the 2024 submissions (e.g., provider credentials not stated in some records, a missing second page/signature on the DHS form), it did not need to resolve their evidentiary weight because materiality failed as a threshold matter due to timing.

4) Scope of Appellate Review; Forfeiture

The court reiterated that in Social Security appeals, it reviews the agency’s decision, not the district court’s drafting accuracy. Typographical errors in the initially issued R&R—promptly corrected—were immaterial to the appellate analysis. Additionally, arguments alleging constitutional violations and emotional distress were forfeited because they were not presented to the agency or the district court, consistent with Flowers.

Likely Impact and Practical Implications

Harmless error applied to diagnostic labels: Claimants cannot secure remand merely by pointing to diagnostic misnomers in an ALJ decision where the ALJ’s underlying analysis addresses the correct functional and listing criteria. This encourages courts and litigants to focus on whether the analysis and outcome would materially change absent the error.
Tightened materiality for new evidence: The decision underscores that evidence generated after the ALJ decision rarely supports sentence‑six remand unless it directly illuminates the claimant’s pre‑decision condition. Post‑decision worsening calls for a new application, not a remand.
Record development in pro se cases: While the duty to develop remains robust, this case shows appellate courts will examine the administrative record carefully and will affirm where the agency made good‑faith efforts and the record is facially complete.
Strategy for practitioners and claimants:
- Preserve all arguments at the agency and district court levels; unraised constitutional or ancillary tort theories will be forfeited.
- When seeking sentence‑six remand, tie new evidence concretely to the pre‑decision period (e.g., retrospective opinions grounded in contemporaneous records) and explain materiality.
- Substantiate “arthritis” and similar impairments with physician or acceptable medical source diagnoses and objective findings during the adjudicated period.
- Do not rely on typographical mistakes in judicial reports; focus on whether the ALJ’s reasoning is supported by substantial evidence and free of legal error.
Institutional guidance: ALJs should strive for diagnostic precision, but minor mislabeling—without downstream analytical error—will generally be insulated by harmless error doctrine. Appeals Councils and district courts may cite this decision in rejecting remand requests based solely on later‑dated records.

Although unpublished and thus non‑precedential, the opinion consolidates and applies existing Eleventh Circuit law in a clear, fact‑specific way likely to be cited for its practical guidance on harmless error and the temporal limits of new evidence in Social Security appeals.

Complex Concepts Simplified

Substantial evidence: A deferential standard of review. The question is not whether the court might have reached a different decision, but whether there is “more than a scintilla” of relevant evidence that a reasonable person would accept to support the ALJ’s conclusion.
Five‑step sequential evaluation (20 C.F.R. § 416.920):
1. Is the claimant engaging in substantial gainful activity?
2. Does the claimant have a “severe” medically determinable impairment?
3. Does the impairment meet or equal a listed impairment?
4. What is the claimant’s residual functional capacity (RFC), and can the claimant perform past relevant work?
5. If not, can the claimant adjust to other work in the national economy?
The ALJ found severe impairments but concluded the listings criteria were not met and that the claimant was not disabled under the Act.
Harmless error: Even if the ALJ makes a mistake (for example, misnaming a diagnosis), the court will not reverse unless the error likely affected the outcome or prejudiced the claimant’s substantial rights.
Sentence‑six remand (42 U.S.C. § 405(g)): A court can send a case back to the SSA to consider new evidence only if the evidence is new and noncumulative, material (there’s a reasonable possibility it would change the result), and there’s good cause for not presenting it earlier. Evidence created after the ALJ decision typically is not “material” to the earlier period unless it specifically and reliably speaks to that earlier time.
Relevant time window: In SSI appeals, the question is whether the claimant was disabled during the period adjudicated by the ALJ. Later evidence showing worsening after that decision usually supports a new claim, not a remand in the old case.
Forfeiture: Arguments not raised in the agency proceedings or in district court are generally lost on appeal absent extraordinary circumstances.

Conclusion

Kavanaugh v. Commissioner reaffirms enduring principles in Eleventh Circuit Social Security jurisprudence. First, appellate review centers on the ALJ’s decision, not district court drafting mishaps; second, minor diagnostic misstatements are immaterial absent prejudice where the ALJ’s substantive analysis is sound; and third, “new” evidence must be tied to the adjudicated time frame to justify remand under § 405(g). The decision provides concrete guidance to claimants and practitioners: build the record during the administrative process, preserve arguments, and ensure any later‑obtained evidence speaks to the earlier period if sentence‑six remand is sought. Where conditions worsen after the ALJ’s decision, the proper remedy is a new application, not a retroactive re‑adjudication.

Bottom line: The Eleventh Circuit affirmed because the ALJ applied the correct legal standards, the record was complete, the decision was supported by substantial evidence, and any inaccuracies were harmless. The court’s structured application of harmless error and materiality doctrines will influence how similar disputes are briefed and decided in future Social Security appeals.