From National Right to Life: "The Health Care Conscience Rights Act (H.R. 940), introduced by Congresswoman Diane Black (R-Tn.), provides badly needed conscience protections for Americans who face an increasingly frequent use of coercive means – governmental and other – to compel participation in providing abortion and other procedures regardless of religious and moral objections."
From the link above, enter your zip code under "Take Action Now" and your letter (email) will be directed to the correct Representative. You will also have to enter your contact information. No sample text is available, so you will have to put your opinion in your own words. A simple, "Please support the Health Care Conscience Rights Act (H.940)" is fine.