Yes, if all you are doing is providing the written interp and report, then you can code 94621-26 for the pulmonary stress testing.
Be sure you're on the right code as there is a 93015-93018 code range for cardiovascular stress testing
94621 Pulm stress test/complex, complete
94621 TC Pulm stress test/complex, technical
94621 26 Pulm stress test/complex, interp & report
93015 Cardiovascular stress test, complete
93016 Cardiovascular stress test, physician supervision
93017 Cardiovascular stress test, technical
93018 Cardiovascular stress test, interp & report