This case-sensitive code system http://fhir.ch/ig/ch-crl/CodeSystem/nkrs-annarborstaging defines the following codes:

Code	Display
I	Stage I
I+A	Stage I+A
I+B	Stage I+B
IE	Stage IE
IE+A	Stage IE+A
IE+B	Stage IE+B
I(E)	Stage I(E)
I(E)+A	Stage I(E)+A
I(E)+B	Stage I(E)+B
II	Stage II
II+A	Stage II+A
II+B	Stage II+B
IIE	Stage IIE
IIE+A	Stage IIE+A
IIE+B	Stage IIE+B
II(E)	Stage II(E)
II(E)+A	Stage II(E)+A
II(E)+B	Stage II(E)+B
III	Stage III
III+A	Stage III+A
III+B	Stage III+B
IIIE	Stage IIIE
IIIE+A	Stage IIIE+A
IIIE+B	Stage IIIE+B
III(E)	Stage III(E)
III(E)+A	Stage III(E)+A
III(E)+B	Stage III(E)+B
IIIS	Stage IIIS
IIIS+A	Stage IIIS+A
IIIS+B	Stage IIIS+B
III(S)	Stage III(S)
III(S)+A	Stage III(S)+A
III(S)+B	Stage III(S)+B
IIIES	Stage IIIES
IIIES+A	Stage IIIES+A
IIIES+B	Stage IIIES+B
III(E)S	Stage III(E)S
III(E)S+A	Stage III(E)S+A
III(E)S+B	Stage III(E)S+B
IIIE(S)	Stage IIIE(S)
IIIE(S)+A	Stage IIIE(S)+A
IIIE(S)+B	Stage IIIE(S)+B
III(E)(S)	Stage III(E)(S)
III(E)(S)+A	Stage III(E)(S)+A
III(E)(S)+B	Stage III(E)(S)+B
IV	Stage IV
IV+A	Stage IV+A
IV+B	Stage IV+B