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We present a calculation of the pi^- d scattering length with an accuracy ofa few percent using chiral perturbation theory. For the first timeisospin-violating corrections are included consistently. Using data on pionicdeuterium and pionic hydrogen atoms, we extract the isoscalar and isovectorpion-nucleon scattering lengths and obtain a^+=(7.6 +/- 3.1) x 10^{-3} mpi^{-1}and a^-=(86.1 +/- 0.9) x 10^{-3} mpi^{-1}. Via the Goldberger-Miyazawa-Oehmesum rule, this leads to a charged-pion-nucleon coupling constant g_c^2/4 pi =13.69 +/- 0.20.

Precision calculation of the pi^- deuteron scattering length and its impact on threshold pi-N scattering