  Silicon pixel detectors are at the core of the current ATLAS detector and its
planned upgrade. As the detectors in closest proximity to the interaction
point, they will be exposed to a significant amount of radiation: prior to the
HL-LHC, the innermost layers will receive a fluence in excess of $10^{15}$ 1
MeV $n_\mathrm{eq}/\mathrm{cm}^2$ and the HL-LHC detector upgrades must cope
with an order of magnitude higher fluence integrated over their lifetimes. This
talk presents a digitization model that includes radiation damage effects to
the ATLAS Pixel sensors for the first time. After a thorough description of the
setup, predictions for basic pixel cluster properties are presented alongside
first validation studies with Run 2 collision data.
