How to decipher codes on death certificate
Hello! I am researching an ancestor who died in Skagit County, Washington in 1931. I see her ICD index code for her cause of death, but she also has a 3 digit code next to her name. In poking around, I saw that all of the other people who passed away in various other hospitals, or at home also had a 3 digit code next to their names. This was the case in other counties during that time as well. Can anyone tell me what this 3 digit code refers to?