Preventing Lead Poisoning Act of 2019 This bill requires coverage under the Children's Health Insurance Program (CHIP) of lead blood level assessments. Specifically, CHIP must cover a child's assessment once at the age of 12 months and once at the age of 24 months, or once between the ages of 24 months and 72 months if the child has never been assessed. The bill also provides statutory authority for these requirements (regarding testing intervals) for state Medicaid programs.