Arkansas Medicaid ex parte renewal share, August 2026

Ex parte share measures how much of the renewal burden the state carries instead of the beneficiary. It trends with data-matching infrastructure, which improves in vendor-release steps rather than smoothly.

Latest 89.1 (02/26); mean monthly change over trailing window 0.22pp; damped six-month projection = 89.8.

Half-weight trend continuation with volatility-scaled uncertainty; renewal cohorts differ month to month, so the interval is wider than the point trend alone would suggest.

The resolver is a state row, not a national weighted average: Arkansas's original first-publication August 2026 reporting-period row in the CMS eligibility processing dataset. The target is the share of completed renewals processed ex parte, reported in percent and rounded to one decimal.

Base-rate/reference-class anchor: the most relevant outside view is Arkansas's own recent first-print run for this CMS eligibility-processing series. The five-point sample from July 2025 to February 2026 ranges from 85.9 to 91.1 percent and has a simple average of 88.4 percent, with the latest two observations at 91.1 and 89.1 percent.

Level, momentum, and mechanism: the level is already near the upper end of normal administrative performance, so the forecast should not extrapolate mechanically toward 100. The 2026-02 value of 89.1 is below January's 91.1 but above the 2025 values, consistent with a high plateau plus renewal-cohort noise.

Prior/update/interval: prior model is Arkansas latest-value persistence with a damped local trend, using five observed first-print values from 2025-07, 2025-09, 2025-11, 2026-01, and 2026-02. The five-point sample center is 88.4 percent and the range is 85.9 to 91.1 percent; I put most weight on latest-value persistence at 89.1, add +0.5 pp for the higher 2026 level versus 2025 and +0.2 pp for mild compliance/operations pressure, yielding 89.8. The 80% interval starts from the 5.2 pp observed sample range, adds about 2.5 pp total for missing-month and cohort-mix uncertainty, and allows a somewhat wider upper tail because automated data matching could improve without hitting the 100 percent ceiling.

Counter-consideration: upside outside the interval would require Arkansas to print above 93.9 percent through more complete automated data matching or a renewal cohort unusually suited to ex parte processing. Downside outside the interval would require a manual-heavy renewal cohort, data-source outage, eligibility-system issue, or reporting break pushing the share below 85.6 percent.

Point calculation: latest 89.1 percent plus +0.5 pp damped high-2026-level adjustment plus +0.2 pp mild policy/operations adjustment gives 89.8 percent. Interval calculation: center 89.8, lower half-width 4.2 pp and upper half-width 4.1 pp, reflecting the 5.2 pp recent realized range plus roughly 2.5 pp added uncertainty spread across tails and slight ceiling compression, yielding 85.6 to 93.9 after rounding.

Resolution-date note: the canonical ledger target uses 2026-12-15. The checked CMS release context supports the official data.Medicaid.gov monthly release vehicle but did not expose a separate future dated August 2026 Arkansas placeholder, so I keep the forecast tied to the ledger target and bind resolution to the first official CMS dataset print.

Review disposition: accepted the resolver fix by removing the release-day correction exception, made the interval construction more explicit, split the +0.7 pp update into persistence-dominant components, and added the five-point sample size, center, and range. Kept the canonical 2026-12-15 resolutionDate because no exact future CMS placeholder was found in the checked context.