Per Appendix B, the source of the data is the CDC's Wonder "multiple cause of death" data, which does include the codes you mention: https://wonder.cdc.gov/mcd

Per Appendix B, the source of the data is the CDC's Wonder "multiple cause of death" data, which does include the codes you mention: https://wonder.cdc.gov/mcd-icd10.html https://wonder.cdc.gov/mcd-icd10.html "... The Multiple Cause of Death database contains mortality and population counts for all U.S. counties. Data are based on death certificates for U.S. residents. Each death certificate contains a single underlying cause of death, up to twenty additional multiple causes, and demographic data. The number of deaths, crude death rates, age-adjusted death rates and 95% confidence intervals for death rates can be obtained by cause of death (4 digit ICD-10 codes, 113 selected causes of death, 130 selected causes of infant death, drug and alcohol related causes of death, injury intent and injury mechanism categories) ..." The fact that a study-cum-policy-paper happens to also cite reporting on the problem is par for the course.