Indiana Code Title 27. Insurance § 27-7-2-20.4

Sec. 20.4. (a) A company or the bureau may not make any arrangement with any other company or other person that has the purpose or effect of restraining trade unreasonably or of substantially lessening competition in the business of insurance.

(b) A company may not agree with any other company or the bureau to adhere to or use any rate, rating plan (other than the experience rating plan), or rating rule except as needed to comply with the requirements of section 20 of this chapter.

(c) The fact that two (2) or more companies use consistently or intermittently the same rules, rating plans, rating schedules, rating rules, policy forms, rate classifications, underwriting rules, surveys, or inspections or similar materials is not sufficient in itself to support a finding that an agreement prohibited by subsection (b) exists.

(d) Two (2) or more companies having a common ownership or operating in Indiana under common management or control may act in concert between or among themselves with respect to any matters pertaining to those authorized in this chapter as if they constituted a single company.