HRC.org puts out a Corporate Equality Index every year. They ask companies if they meet specific criterion and they are rated on their answers:Criterion 1a Prohibits Discrimination Based on Sexual Orientation (15 points)
Criterion 1b Provides Diversity Training Covering Orientation (5 points)
Criterion 2a Prohibits Discrimination Based on Gender Identity or Expression (15 points)
Criterion 2b Provides Diversity Training Covering Gender Identity OR Has Supportive Gender Transition Guidelines (5 points)
Criterion 2c Offers Transgender-Inclusive Insurance Coverage for at Least One Type of Benefit (5 points) (+ Offers Transgender-Inclusive Insurance Coverage, Including Surgical Procedures)Criterion 3a Offers Partner Health Insurance (15 points)
Criterion 3b Offers Partner Dental, Vision, COBRA and Dependent Coverage Benefits (5 points)
Criterion 3c Offers at Least Three Other "Soft" Benefits for Partners (5 points)
Criterion 4 Has Employer-Supported Employee Resource Group OR Firm-Wide Diversity Council (15 points) (/ Would Support ERG if Employees Express Interest, half-credit)
Criterion 5 Positively Engages the External LGBT Community (15 points)
Criterion 6 Exhibits Responsible Behavior Toward the LGBT Community; Does Not Engage in Action That Undermine LGBT Equality. Employers Found Engaging in Such Activities Will Have 15 Points Removed From Their Scores. (0 points)
So if you want to have your surgeries covered, check the list out and go work for the employers with a + in the 2c category. 
What is encouraging is the bar graph that shows a continual increase of companies rated 100%. Next year HRC will be getting tougher on the TG requirements, finally! THe battle isn't over but at least the progress we're making keeps moving forward.
Julie