  Measurements of the inclusive and differential production cross sections for
the Higgs boson in the diphoton decay channel are performed using the data set
of proton-proton collisions at $\sqrt{s} =$ 13 TeV collected by the CMS
experiment at the LHC in 2016 and corresponding to an integrated luminosity of
35.9 fb$^{-1}$. The cross sections are measured in a fiducial phase space
defined by a set of requirements on the isolation and kinematic variables of
the photons. Differential cross sections are measured as functions of the
kinematic properties of the diphoton system and the event. A subset of the
measurements is performed in subregions of the fiducial phase space, where
relative contributions of specific Higgs boson production mechanisms are
enhanced. The total cross section in the chosen fiducial phase space is
measured to be 84 $\pm$ 11 (stat) $\pm$ 7 (syst) fb = 84 $\pm$ 13 fb, to be
compared with a theoretical prediction of 73 $\pm$ 4 fb. All measurements are
found to be in agreement with the theoretical predictions for the standard
model Higgs boson with a mass of 125.09 GeV within the experimental and
theoretical uncertainties.
