Key facts: Indiana Code § 29-1-8-1 governs all creditor claims against decedents' estates; the eligibility threshold for certain streamlined procedures is $100,000; a mandatory 45-day waiting period applies after estate opening before claims processing begins; creditors must provide written notice specifying claim nature, amount, and basis; personal representatives may allow, reject, or contest claims; rejected claims require timely legal action to avoid being permanently barred; and claims are paid according to statutory priority when estate assets are insufficient.