readcode readterm 6648.00 coeliac disease monitoring 6648000 coeliac disease annual review 68W4.00 coeliac disease autoantibody profile positive 8IAp.00 coeliac disease annual review declined 9mB..00 coeliac disease monitoring invitation 9mB1.00 coeliac disease monitoring invitation first letter J690.00 coeliac disease J690.11 coeliac rickets J690.12 gee - herter disease J690.13 gluten enteropathy J690.14 sprue - nontropical J690000 congenital coeliac disease J690100 acquired coeliac disease J690z00 coeliac disease nos ZC2C200 dietary advice for coeliac disease