AI failures · Incorrect automated decision

Idaho Medicaid Budget Tool — Federal Court Finds Formula-Driven Cuts Violated Due Process (K.W. v. Armstrong)

Verified Checked against its sources on October 16, 2026 4 sources quoted

Where it happened: Idaho, United States
Organization: Idaho Department of Health and Welfare
Date: Cuts from July 2011; ACLU class action filed 2012; memorandum decision filed March 28, 2016
Function: Government / Healthcare
Where it happened: Benefits administration; Medicaid
System: In-house Medicaid budget-calculation tool (spreadsheet-based formula)
Technology: Rules-based automation (not AI)
Type of failure: Incorrect automated decision
Caught by: The person affected, A court

Summary

Idaho's Department of Health and Welfare used an in-house budget tool to set Medicaid assistance for about 4,000 adults with developmental disabilities. From 2011 participants saw their budgets cut, some by 20 to 30 percent, with no explanation, and the state at first refused to disclose the formula as a trade secret. The ACLU of Idaho sued in 2012 (K.W. v. Armstrong). A preliminary injunction restored budgets to pre-July 2011 levels, and in March 2016 the federal court held that the system arbitrarily deprived participants of their property rights in violation of due process and ordered safeguards, including regular testing of the tool.

Consequence

Preliminary injunction restored participants' budgets to their pre-July 2011 levels
Federal court held in March 2016 that the system arbitrarily deprived participants of property rights in violation of due process

Who caught it The person affected, A courtFound outside the organization

Analysis

What could have been done

A way for affected people to challenge the decision

People affected by an automated decision can challenge it and get a human re-review.

From 2011 participants' budgets were cut, some by 20 to 30 percent, with no explanation, and the state at first refused to disclose the formula as a trade secret; the federal court held the system arbitrarily deprived participants of property rights in violation of due process.

Testing before use

The system is tested for accuracy, bias and failure modes on representative cases before use.

A spreadsheet-based formula built from 2009-2010 participant data set assistance for about 4,000 adults, and the court's remedy included safeguards such as regular testing of the tool.

What would likely have prevented it

Give each person the inputs and calculation behind an automated amount, and a route to a human re-review, before a reduction takes effect.
Test a formula against a sample of individual cases assessed by qualified staff before it sets amounts, and retest it on a regular schedule.

What would likely have caught it earlier

Hold for human review any automated result that changes a person's amount by more than a set percentage from the prior period, before the notice is issued.

Key dates

March 28, 2016Event
October 16, 2026Checked against sources
October 18, 2026Checked against sources
October 21, 2026Checked against sources

Developments are added when the record is reviewed. Next review: October 16, 2027.

Evidence

Each passage is quoted from its source. The quoted passages are re-checked against the live pages every month.

In 2012, the local ACLU branch brought suit on behalf of the program's beneficiaries, arguing that Idaho's actions had deprived them of their rights to due process.

Supports: ACLU suit in 2012 on due process grounds (cited URL redirects to this article, which is mainly about Arkansas)

A healthcare algorithm started cutting care, and no one knew why The Verge Reporting or analysis
That injunction restored the Plaintiffs' budgets to the levels they were at prior to July 1, 2011, the date IDHW sent the unconstitutional budget notices.

Supports: Budget reductions from July 2011; injunction restoring budgets; decision filed March 28, 2016

K.W. v. Armstrong, Memorandum Decision and Order, Case No. 1:12-cv-00022-BLW (D. Idaho) U.S. District Court for the District of Idaho (hosted by ACLU of Idaho) Primary source
The federal court agreed this week, holding that the Idaho Department of Health and Welfare "arbitrarily deprives participants of their property rights and hence violates due process."

Supports: Due process ruling, March 2016

Federal Court Rules Against Idaho Department of Health and Welfare in Medicaid Class Action ACLU of Idaho Reporting or analysis
the amount of assistance that they were being given each year by the state Medicaid program was being suddenly cut by 20 or 30 percent.

Supports: Size of cuts; class of about 4,000

Pitfalls of Artificial Intelligence Decisionmaking Highlighted In Idaho ACLU Case American Civil Liberties Union Reporting or analysis

Suggested citation. Eminence Scan, “Idaho Medicaid Budget Tool — Federal Court Finds Formula-Driven Cuts Violated Due Process (K.W. v. Armstrong)”, Eminence Growth Solutions, last verified October 16, 2026, https://eminencegrowthsolutions.com/tools/eminence-scan/record/fail-049/.

Using our research: you may read and quote Eminence Scan with credit to “Eminence Scan, Eminence Growth Solutions” and a link; all other rights reserved. Terms: Using our research.

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