Nonadiabatic dissociation energies are calculated for 619 vibration-rotation levels of the ground electronic state of HD+using a transformed Hamiltonian and an artificial-channels scattering method. In particular, coupling of rotational and electronic angular momenta is accounted for, so that levels with highNmay be studied. Relativistic and radiative corrections are added to give dissociation energies, from which calculated transition energies may be compared with the experimentally available values; the agreement is good, in most cases to within experimental error (0·001 cm-1).