Table 1. ICD-10 codes used to identify cases of psoriasis and psoriatic arthritis in the Skåne Healthcare Register.

ICD-10 code	Diagnosis full text
L40.0	Psoriasis vulgaris
L40.1	Generalized pustular psoriasis
L40.2	Acrodermatitis continua
L40.4	Guttate psoriasis
L40.5	Arthropathic psoriasis
L40.8	Other psoriasis
L40.9	Psoriasis unspecified
M07.0	Distal interphalangeal psoriatic arthropathy
M07.1	Arthritis mutilans
M07.2	Psoriatic spondylitis
M07.3	Psoriatic arthropaties
M09.0	Juvenile arthritis in psoriasis