At long last (seriously, I set up a Google alert for this legislation in 2013), Washington's state legislature last week successfully passed the Reproductive Parity Act, which mandates that insurance companies that cover maternity care must also cover abortion. Here's KIRO News:

The Senate concurred on changes made in the House to Senate Bill 6219 and passed it on a 27-22 vote Saturday. The measure now heads to Gov. Jay Inslee for his expected signature.

In addition to linking abortion coverage with maternity care, the bill would require health plans issued or renewed after Jan. 1, 2019, to provide copayment- and deductible-free coverage for all contraceptive drugs and devices, as well as voluntary sterilization and any consultations or other necessary procedures.

Inslee will almost certainly sign this legislation. It's worth noting that while it doesn't carry the same protections for transgender and undocumented patients, this is a law very similar to Oregon's Reproductive Health Equity Act, which was passed out of the legislature in July, and its passage further fortifies the West Coast as a region bucking the nationwide trend of limiting attacks on reproductive rights.