FA21

ICD-11 MMS 2026-01

Psoriatic arthritis

Description

Psoriatic arthritis, a member of the spondyloarthritis family, is defined as an inflammatory arthropathy associated with psoriasis that is usually rheumatic factor negative. It is characterised by various clinical manifestations, including symmetric polyarthritis, asymmetric oligoarthritis or polyarthritis, spinal inflammation similar to ankylosing spondylitis, peripheral enthesitis, anterior chest wall involvement, distal interphalangeal arthritis of the hands and feet, dactylitis (sausage digit or toe), arthritis mutilans and onycho-pachydermo-periostitis. The CASPAR has high sensitivity and specificity.

Excludes

  • FA24.2 – Juvenile psoriatic arthritis

Exclusions from above levels

  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
Show allHide
  • 19 – Certain conditions originating in the perinatal period
  • 22 – Injury, poisoning or certain other consequences of external causes
  • DA0E.8 – Temporomandibular joint disorders

Child codes

  • FA21.0 – Psoriatic spondyloarthritis
  • FA21.Y – Other specified psoriatic arthritis
  • FA21.Z – Psoriatic arthritis, unspecified

Sibling codes

  • FA20 – Rheumatoid arthritis
  • FA22 – Polymyalgia rheumatica
  • FA23 – Adult-onset Still disease
  • FA24 – Juvenile idiopathic arthritis
  • FA25 – Gout
  • FA26 – Certain specified crystal arthropathies
  • FA27 – Certain specified inflammatory arthropathies
  • FA2Z – Inflammatory arthropathies, unspecified

Foundation entity

Psoriatic arthritis – http://id.who.int/icd/entity/868183264

Allowed postcoordination axes

Part of: 15: Diseases of the musculoskeletal system or connective tissue