8A40.2
category
Secondary progressive multiple sclerosis
Definition
To date, there are no clear clinical, imaging, immunological or pathological criteria to determine the transition point when relapsing remitting multiple sclerosis converts to secondary progressive multiple sclerosis; the transition is usually gradual. This has limited our ability to study the imaging and biomarker characteristics that may distinguish this course.
Coding note
This category is to be used to indicate Secondary progressive multiple sclerosis, after an initially relapsing/remitting course (includes remitting relapsing progressive, may have superimposed relapses)
Also indexed as
Secondary progressive multiple sclerosis