Iowa 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 72.7 (02/26); mean monthly change over trailing window 1.88pp; damped six-month projection = 78.3.

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 single Iowa state row, not a national weighted average: the original first-publication August 2026 reporting-period row in CMS State Medicaid and CHIP Eligibility Processing Data. The target is the share of completed Medicaid renewals processed ex parte, in percent rounded to one decimal.

Base-rate/reference class: the relevant outside view is Iowa's own recent original-submission first-print run, because the target resolves a single state row. The five inspected values average 70.4 percent, span 60.8 to 85.3 percent, and have a latest usable value of 72.7 percent.

Level, momentum, and mechanism: Iowa moved from around 61 percent in mid-2025 to a much higher January 2026 print before falling to 72.7 percent in February. I treat the January high as partly cohort or reporting composition, but the early-2026 level still suggests Iowa's baseline has shifted above the 2025 low-60s readings.

Prior/update/interval: prior model is Iowa latest-value persistence blended with a five-point Iowa mean and a damped local trend, using the limited observed original first-print subset from 2025-07, 2025-09, 2025-11, 2026-01, and 2026-02. I start at latest usable 72.7, add +3.0 pp for persistence of the higher early-2026 level versus the 2025 average, and add a subjective +2.3 pp damped drift for possible continued automation/compliance improvement, giving 78.0. The 80% interval uses realized first-print dispersion, widened for six-month horizon, renewal-cohort risk, and missing-month uncertainty, while keeping the upper tail below 100 percent.

Counter-consideration: upside outside the interval would require a durable data-match or eligibility-system improvement plus an ex parte-friendly renewal cohort pushing Iowa above 91.5 percent. Downside outside the interval would require a manual-heavy cohort, data-source outage, eligibility-system issue, reporting break, or reversal toward the 2025 low-60s pattern pushing the first print below 63.5 percent.

Historical mean = (61.8 + 60.8 + 71.2 + 85.3 + 72.7) / 5 = 70.4 percent. Observed adjacent changes in the usable subset were -1.0, +10.4, +14.1, and -12.6 pp, with mean absolute change about 9.5 pp. Point calculation: latest usable 72.7 + 3.0 pp higher-level persistence adjustment + 2.3 pp damped judgmental automation/compliance drift = 78.0. Interval calculation: center 78.0, lower half-width 14.5 pp and upper half-width 13.5 pp, chosen as roughly 1.4 to 1.5 times the 9.5 pp adjacent-change volatility to cover the six-month horizon and missing-month uncertainty, yielding 63.5 to 91.5 after rounding.

Resolution-date note: the canonical ledger target uses 2026-12-15, tied to CMS's monthly data.Medicaid.gov release vehicle for a three-to-four-month-lag August 2026 first print. I did not find a separate future-dated CMS placeholder in the sandbox; I keep the target's date and bind scoring to the first official CMS dataset print.

Review disposition: accepted the critique to label the +2.3 pp drift as judgmental rather than directly evidence-driven, and added a clearer explanation of interval half-widths from observed adjacent-change volatility and horizon risk. I did not change the point, interval, resolver, or source set.