The New Hampshire Insurance Department is taking the first step toward changing how it decides whether insurance companies are offering adequate networks of doctors and other providers. The department said Monday it will hold an organizational meeting April 23 for a working group that will review the state's network adequacy rules and make recommendations to the Legislature. Insurance Commissioner Roger Sevigny first mentioned the working group last month, at a public hearing requested by Frisbie Memorial Hospital. The Rochester facility is one of 10 New Hampshire hospitals excluded from the provider network for policies purchased under the federal health care overhaul law.