Level of care and frequency of diagnostic codes for the cases identified as psoriasis with psoriatic arthritis (PsA) in Skåne Healthcare Register 2005–2010; validation of diagnostic codes by review of medical records for a subsample of these cases.

†Any code consistent with PsA.
††Adjustment based on the proportion of correct diagnostic codes (the positive predicted value) of PsA in the SHR °Medical records for 7 cases (three primary care 1 code, three primary care ≥2 codes and one specialized care ≥2 codes) were impossible obtain due to administrative reasons.