Table S1.
| ICD-8 | ICD-9 | ICD-10 |
|---|---|---|
| 6960 (Psoriatic arthritis opathica) | 696A (Psoriatic joint disease) | L40 (Psoriasis) |
| 6961 (Psoriasis pustulosa and all sites NUD [vulgaris]) | 696B (Other psoriasis) | M070 (Distal interphalangeal psoriatic arthropathy) |
| 69698 (All cause psoriasiformes) | 696F (Other and unspecified scaling) | M071 (Arthritis mutilans) |
| 696W (Other psoriasis-like state) | M072 (Psoriatic spondylitis) | |
| 713D (Arthropathy and skin diseases) | M073 (Other psoriatic arthropathies) |
Abbreviations: ICD, International Classification of Diseases.