As many as 75% of U.S. doctors will be writing electronic prescriptions within five years, thanks to new federal spending to encourage e-prescribing, according to a forecast. The economic stimulus bill signed by President Barack Obama last month included about $19 billion to promote the use of healthcare information technology, including e-prescribing. An estimated 13% of U.S. doctors prescribe drugs electronically, leaving the vast majority writing paper prescriptions, according to Surescripts, which operates the largest U.S. electronic prescribing network.