Assuming you're boiling it in water, then 'Yes' ... but it would take an extremely long time to cook to a solid yoke.
According to standards, the boiling point of water decreases
At boiling point the temperature will not change when two phases (liquid & gas) are in equilibrium. This means there is a finite amount of energy being maintained in the liquid during boiling. Since the Bpt is 154 deg-F the amount of energy for cooking the egg would be about 27% less than the available energy at sea level. Cook time would be increased significantly over what it would be at sea level.
This is far as my two remaining brain cells will take me in this issure, but someone might know of a quantitative relationship that defines cook time in terms of Altitude and Kinetic Energy. It seems to be ...
Contributions are always welcome.