CPSO has confirmed that the number for an individual Israeli author writing in Spanish would be PQ8919.
The span PQ8910-PQ8919 is for authors writing in Spanish in "Other parts of Asia".
The schedule directs the user to table P-PZ24, which identifies PQ8919.A-Z for individual literary authors, further subarranged by Table P-PZ40.
While this is not a very specific number, the limited volume of works classed here do not demonstrate a current need for a more specific development.
Lenore