BOSTON, Mass. (WPRI) — Massachusetts lawmakers passed a bill on Monday that would require insurers to cover additional screenings for patients who have abnormal mammograms or dense breast tissue. According to the National Cancer Institute, dense breast tissue can make mammograms more difficult to interpret. As a result, mammographers are more likely to miss cancer in women with dense breasts. The National Cancer Institute also reports that nearly half of all women who are 40 or older have dense breast tissue. Diagnostic exams, MRIs and ultrasounds would all be covered by insurance if a patient has dense breast tissue under the legislation. ALSO READ: RI cancer patient walking to raise money, support others If Gov. Maura Healey signs the bill into law, it will take effect on Jan. 1, 2026. Healey is currently reviewing the legislation, according to a spokesperson. The Dana Farber Cancer Institute applauded the state legislature, calling the bill a significant policy change that will make treatment more equitable. "We know that when health plans cover medically necessary screening and diagnostic breast imaging, we can detect breast cancer at an earlier stage which can make an enormous difference in outcomes," said Dr. Caroline Block, Dana Farber's clinical director of breast oncology. "Indeed, this bill will improve health and save lives." Close Thanks for signing up! Watch for us in your inbox. Subscribe Now Daily Roundup SIGN UP NOW