Version 11 was put into effect by WHO as of January 1, 2022.
Note there are also separate lists for oncology / cancer (the ICD - 0), as well as other diseases and fields of medicine.
Which ICD Version / Revision year to use?
The ILCD or ICD was updated about once a decade after each revision conference, starting in 1900, and was based on the Bertillon Classification of Causes of Death (BCCD) written by French statistician Jacques Bertillon in 1893 and adapted by America, Canada, and Mexico in 1898.
Though some years have greater changes than others, it is still important to use the codes for the correct year. Different countries implemented the ICD updates in their country at different times, however. Different countries may also have additional updates and variations.
Knowing which ICD to use to decipher death certificate codes can be a little tricky, as the date of the conference / revision may have been a year or two before the resource list was published (per the chart above). For example, if you have a death certificate in the United States from 1966, your instinct might be to use the 8th revision, as the conference was in 1966 - but WHO didn’t publish this information until 1967.
Furthermore, especially with the later revisions, the US did not always immediately implement the update. For example, though the ICD-10 conference was in 1990, the US didn’t start using ICD-10 for death certificates until 1999.
What is “Wolfbane”?
Many genealogists utilize the free website for Wolfbane Cybernetics, as it seems to be one of the few online resources that list earlier versions of the IDC.
It is not entirely clear to me where Wolfbane has pulled this information from, especially from the older versions. As it a website based in the UK, my best guess is that they used books like “The Manual of the International List of Causes of Death, as adapted for use in England and Wales: Based on the second decennial revision by the commission, Paris, 1909” (View on the Internet Archive) published in 1912 in London by His Majesty’s Stationery Office.
The lists seem closely aligned with historical translated publications in the US, to the best of my knowledge, so I would feel comfortable to continue using Wolfbane as a source to quickly lookup a code or two, as browsing through the books on Internet Archive can be tedious.
Note there is also a very helpful, and underutilized decoder on Wolfbane for versions ICD 6, ICD 7, ICD 8, ICD 9, and ICD 10 in which you can enter the code and it offers the cause of death, but I hesitate to link it directly as it runs as an exe program. Find the “ICD Decoder” as the third item on this page of Wolfbane.
If Wolfbane is down, remember you can always reference the Wayback Machine on the Internet Archive to view past instances of the website.
As for the name, I believe “wolfbane” is a synonym of wolfsbane, the poisonous purple flower also known as aconite. I’m not entirely sure who is behind Wolfbane Cybernetics, why they named the site Wolfbane, or why the site looks circa the turn of the millennium - but it is a helpful website!
Why bother to look up these numbers?
It’s not something you need to do for every death certificate, but it can be helpful in some circumstances:
Doctors handwriting can be hard to read!
We want to know more about the cause of death
Only a number is shown, not a cause of death
Use when compiling family medical history to standardize causes of death
What do other numbers on the death certificate mean?
They most likely have to do with coding the data for statistical purposes. For examples, states may be numbered 1 - 51, Canada as 55, Mexico as 57, and the rest of the world 59. Items not able to be classified were generally 9 or 99. Occupations were also classified as statistical data on some forms.
They would also number the certificates, usually in the top right corner, in the order they received them.
What do different colored death certificates mean?
I get this question a lot. While the exact answer depends on the state and time period, generally a different color was used for each different form. For example, in this FamilySearch collection of Massachusetts death certificates, “Deaths 1924 Abington to Amesbury Vol. 1” you can see they used the yellow form R-301 Standard Certificate of Death; pink form R-302 for Standard Certificate of Death (slightly different, I think there is an added signature); the blue form R-303 Medical Examiner’s Certificate of Death; green form R-307 Additional Information for Death Certificate; and so on.
Have you come across different colored forms in your research?
Can we see an example of the ICD numbers?
Of course. Below is an excerpt of a death certificate from 1914 in Philadelphia, Pennsylvania: