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Prabhakar fractional PDEs require discretization of singular Mittag-Leffler kernels. This paper establishes three results: (1) Lemma proving singularity extraction preserves O(∆x 4 ) convergence via analytical log-integral and Simpson quadrature. (2) Theorem with composite error bound O(∆t 2 + ∆x 4 + exp(−ρnmax)). (3) Stability validation across 125 parameter combinations (α × β × γ grid). Tests include grid refinement (Zeng comparison < 0.1%), discontinuous data (2nd-order), and 20 manufactured solutions across parameter space. Independent verification of Karimov et al. (2025) Green’s function via classical heat equation limit (agreement 4.0 × 10−10) confirms construction.