Table 2.
Specification of outcome chronic inflammatory diseases (CIDs) with associated diagnostic code and treatment codes
| CID | Diagnostic code (NPR) | Medical treatment (DNPR and NPR) | Department with relevant area of specialisation | ||
| ICD-8* | ICD-10 | ATC code (DNPR)† | Treatment code (NPR)† | ||
| Crohn’s disease (CD) | 563.00, 563.02, 563.08, 563.09, 563.91 |
K50.0–50.9 | L04AB02 L04AB04 L04AB06 L04AB05 L04AA33 L04A×01 L04A×03 L01BB02 A07E |
BOHJ18A1 BOHJ18A3 BOHJ18A4 BOHJ18A5 BOHJ26 BOHJ19H4 |
Gastroenterology, internal medicine |
| Ulcerative colitis (UC) | 563.99, 563.19 569.04 |
K51.0–51.9 | Gastroenterology, internal medicine |
||
| Chronic polyarthritis, including RA | 712.19, 712.29, 712.39, 712.59 | M05.9, M06.0 | L04A×01 L04A×03 L04AA13 P01BA02 |
BWHA115 BLHM2 BWHB83 BOHJ18 |
Rheumatology, internal medicine |
| Psoriatic arthritis | 696.09 | M09.0, M07.3, M46.8+M07.2 | Rheumatology, internal medicine |
||
| Psoriasis | 696.10, 696.19 | L40.0–40.9 | D05A×02 D05BB02 D05B L04AA32 L04AB01-02 L04AB04 L04AC05 L04AC10 L04AC13 L04AD01 L04A×03 |
BWHA115 BOHJ20 BNHC BOHJ18A1-3 BOHJ18B3 BOHJ18B5 |
Dermatology, internal medicine |
| Multiple sclerosis (MS) | 734.0–9‡ | G35.9‡ | Not used | Not used | Danish Multiple Sclerosis Registry (DMSR) |
*International Classification of Disease (ICD)-8 and ICD-10 codes will be used to define participants with a CID diagnosis.
†These Anatomical Therapeutic Chemical classification (ATC) and treatment codes for CD and UC are used by the Danish National Registry for Biological Therapy in Inflammatory Bowel Disease.98
‡ICD-8 and ICD-10 codes for MS will be extracted from the DMSR.
DNPR, Danish National Prescription Registry; NPR, National Patient Registry; RA, rheumatoid arthritis.