Two goals were scored towards the end of the second half. Atalanta took the lead through Nikola Krstovic before Rafiu Durosinmi equalized.
This result was Pisa's 11th draw of the season and ended Atalanta's three-game winning streak in all competitions.
Atalanta are still in seventh place in the standings with 32 points, two points behind Como who are in the European competition zone.
Meanwhile, Pisa is in 19th place with 14 points, according to the Serie A website.
Pisa were finding more opportunities in the opposition box, but their lack of finishing meant the hosts struggled to create any real chances.
