Charlson comorbidity index (from primary and secondary care)
Name charlson_composite
Chapter Health Behaviour/Consultation behaviour
Definition
Charlson comorbidity index, without the age component, calculated using Read codes in GPRD and ICD-10 codes in HES for all events prior to a specified date.
Data Type Continuous
Data sources GPRD, HES
Repeated No
Valid event date range -
Agreed 19 Nov 2013 (Revision 1)
Implementation
Generate binary variables stating whether or not a patient has any events with a Read/ICD-10 code in the categories below before the index date
(HES primary or secondary, or CPRD):

weight; charlson; variable;                  categories

1; mi;          myo_infarct_gprd;            1,2,3,4,5,6,7
1; mi;          myo_infarct_hes;             1,2,3,4,5,6,7

1; hf;          hf_gprd;                     1,3,4,5,6
1; hf;          hf_hes;                      1,3,4,5,6

1; pad;         arterial_gprd;               1,4,7,8
1; pad;         arterial_hes;                1,4,7,8
1; pad;         aaa_proc_gprd;               3

1; stroke;      tia_gprd;                    1,3
1; stroke;      tia_hes;                     1,3
1; stroke;      stroke_nos_gprd;             1,3
1; stroke;      stroke_nos_hes;              1,3
1; stroke;      ischaemic_stroke_gprd;       1,3
1; stroke;      ischaemic_stroke_hes;        1,3
1; stroke;      haem_stroke_gprd;            1,3,4,5,6,7,8
1; stroke;      haem_stroke_hes;             1,3,4,5,6,7,8

1; dementia;    dementia_gprd;               2,3,4,5
1; dementia;    dementia_hes;                2,3,4,5

1; respiratory; respiratory_charlson_gprd;   1,3
1; respiratory; respiratory_charlson_hes;    1,3

1; connective;  connective_charlson_gprd;    3
1; connective;  connective_charlson_hes;     3

1; peptic;      pepticulcer_gprd;            3
1; peptic;      pepticulcer_hes;             3

1; mildliver;   liver_charlson_gprd;         3
1; mildliver;   liver_charlson_hes;          3

1; diabetes;    dm_gprd;                     1,3,4,6
1; diabetes;    dm_hes;                      1,3,4,6

2; hemiplegia;  hemiplegia_charlson_gprd;    3
2; hemiplegia;  hemiplegia_charlson_hes;     3

2; renal;       renal_gprd;                  5,6,7
2; renal;       renal_hes;                   5,6,7

2; dmcomp;      diabcomp_gprd;               1,2,3,4,5,6,7,8,9
2; dmcomp;      diabcomp_hes;                1,2,3,4,5,6,7,8,9

2; cancer;      cancer_gprd;                 1,3,4,5
2; cancer;      cancer_hes;                  1,3,4,5

3; severeliver; liver_charlson_gprd;         4
3; severeliver; liver_charlson_hes;          4

6; aids;        hiv_gprd;                    2,3
6; aids;        hiv_hes;                     2,3

6; mets;        cancer_gprd;                 6
6; mets;        cancer_hes;                  6

Each Charlson variable is TRUE if there is an event with a code in the appropriate category before the date of interest (HES primary or secondary, or CPRD).
SET diabetes to FALSE if dmcomp is TRUE.
SET cancer to FALSE if mets is TRUE.

Add up the weights for all the Charlson variables for a patient.
Codelist version
Codelist authors
Creation date
Warning! Unless explicitly noted otherwise, three-digit ICD10/OPCS4 codes also include all codes below them.
Category (code) Clinical code Clinical term Datasource lookup
()
comments powered by Disqus