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One missed timely filing deadline turns real revenue into permanent write-offs with no appeal possible. This 2026 guide reveals why timely filing failures happen, exact deadlines by payer (Medicare, Medicare Advantage, commercial, Texas Medicaid), the three most common causes, and the proven systems that keep timely filing write-offs under 0.3%.

Your nephrologist saw 18 patients today, but your billing team only collected for 14. The other 4 are still aging in AR. In nephrology practices, 20-25% of earned revenue often gets stuck or lost due to capitation lags, secondary claim delays, and unnoticed underpayments. This guide reveals the three invisible leaks draining nephrology AR and shows exactly how optimized workflows can boost collections to 92%+.