The Washington, D.C.. council unanimously passed a bill imposing new limits on health insurance premium hikes for CareFirst BlueCross BlueShield, D.C.’s largest health insurer, as well as other health plans.

The new limits include a ban on different health rates based solely on gender, new guidelines for the D.C. insurance commissioner to determine reasonable rate hikes, and limits on “age bands” that health insurance companies use to set rates, according to the Baltimore Business Journal.

Age band limits, if approved, would restrict rate increases based solely on the age of a covered person advancing by one year to 4%, and no age group’s standard rate could be more than three times the standard rate for any other age, the newspaper said.

A final vote is expected Nov. 23.