215 ILCS 5/356n

No group or individual policy of accident or health insurance or any renewal thereof shall be denied by the insurer, nor shall any policy contain any exception or exclusion of benefits, solely because the insured has been diagnosed as having a fibrocystic breast condition, unless the condition is diagnosed by a breast biopsy that demonstrates an increased disposition to the development of breast cancer or unless the insured's medical history confirms a chronic, relapsing, symptomatic breast condition.