The good about DB2 Fix Packs, there’s no need to follow Fix Pack sequence. Eg, DB2 v9.1 last supported fix is Fix Pack 12. It contains the cumulative fixes of prior versions. Instead of having to apply earlier Fix Packs, the latest one can be used. However, do check on the requirement listed in latest Fix Pack prior to installation.
List of available DB2 Fix Packs can be found here :