Alaska 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 56.2 (02/26); mean monthly change over trailing window -0.93pp; damped six-month projection = 53.4.

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: Alaska'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 Alaska's own post-unwinding first-print run from July 2025 through February 2026, centered in the mid-to-high 50s. I put more weight on the latest 56.2 percent and the January-February rebound than on a smooth national or multi-state average because this resolves a single Alaska state row.

Level, momentum, and mechanism: the recent level is below the September-November 2025 plateau near 61.5 percent but above the January 2026 dip. Momentum is mildly negative after the late-2025 fall, while operational policy pressure and data-match reuse argue for partial persistence rather than a collapse.

Prior/update/interval: prior model is Alaska latest-value persistence with a damped local trend, using the observed official-source subset 2025-07, 2025-09, 2025-11, 2026-01, and 2026-02 rather than a complete monthly panel. The -1.5 pp mean-reversion/trend-damping update, -0.8 pp August-horizon renewal-cohort volatility update, and -0.5 pp rebound-skepticism update are judgmental adjustments grounded in the 7.5 pp late-2025-to-January drop and partial February rebound, moving 56.2 to 53.4. The observed sample spans 54.0 to 61.5 percent with visible adjacent-move dispersion of about 2 to 8 pp, so I start with an 80% half-width near 9 to 10 pp and widen to about 12.8 pp for Alaska small-denominator risk, missing monthly observations, and possible eligibility-system release effects.

Counter-consideration: upside outside the interval would require a durable system or data-match improvement that returns Alaska above the 2025-09 to 2025-11 plateau, roughly above 66 percent. Downside outside the interval would require a failed renewal batch, data-source outage, or unusually manual-heavy cohort that pushes the share near or below 40 percent.

Point calculation: start with latest 56.2 percent and apply a damped six-month trend plus operational-risk adjustment of -2.8 percentage points, giving 53.4 percent. Interval calculation: center 53.4, set a widened lower half-width of 12.9 pp and upper half-width of 12.8 pp from Alaska first-print swings and small-state denominator risk, yielding 40.5 to 66.2 after rounding.

Resolution-date note: the target ledger provides 2026-12-15 for this August 2026 CMS fixed-vintage row, while the official CMS public pages checked through the local run record establish the monthly data.Medicaid.gov release vehicle but did not expose a separate future dated placeholder for this exact August 2026 state row. I keep the forecast tied to the canonical ledger target and bind resolution to the first official CMS dataset print.

Review disposition: accepted the reviewer fixes to remove circular-looking prior values from the catalog lookup, label the downward adjustment as judgmental mean reversion plus horizon/cohort risk, and connect the interval to the observed Alaska sample and widening factors; retained the ledger resolution-date note because no exact future CMS placeholder was observed.