  We classify filtered quantizations of conical symplectic singularities and
use this to show that all filtered quantizations of symplectic quotient
singularities are spherical Symplectic reflection algebras of Etingof and
Ginzburg. We further apply our classification and a classification of filtered
Poisson deformations obtained by Namikawa to establish a version of the Orbit
method for semisimple Lie algebras. Namely, we produce a natural map from the
set of adjoint orbits in a semisimple Lie algebra to the set of primitive
ideals in the universal enveloping algebra. We show that the map is injective
for classical Lie algebras.
