Unmapped condition code `M45X`

[MaximMoinat]

Suspicion that there are ICD10 codes with an X instead of a decimal. We might want to trim these to 3-character ICD10 code (i.e. M45).

ROW_NUM	SOURCE VALUE	#RECORDS	#SUBJECTS
1	M45X9	1,400	500
2	M45X0	400	200
4	M45X2	200	100
10	M45X6	100	100
12	M45X7	100	100
14	M45X3	100	100
15	T08X0	100	100
17	M45X8	100	100
24	M45X1	100	100

Confirmation that these are ICD10 code extension https://biobank.ctsu.ox.ac.uk/crystal/field.cgi?id=41270

Linked to #331