Discrete orthogonal polynomials associated with Macdonald function

New sequences of discrete orthogonal polynomials associated with the modified Bessel function $K_\mu(z)$ or Macdonald function are considered. The corresponding weight function is $\lambda^k \rho_{k+\nu+1}(t)/ k!$, where $\ k \in \mathbb{N}_0, \ t \ge 0,\ \nu > -1,\ 0 < \lambda < 1,\ \rho_{\mu}(z) = 2 z^{\mu/2} K_\mu\left( 2\sqrt z\right)$. The limit case $t=0$ corresponds to the Meixner polynomials. Various properties, differential-difference recurrence relations are established. The modified sequence of polynomials with the weight $\lambda^k \rho_{k+\nu+1}(\lambda t)/ k!$ is investigated as well.