ICD-10 Code L40.53 – Psoriatic spondylitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.53 – Psoriatic spondylitis
What it is
L40.53 identifies psoriatic spondylitis, an inflammatory spinal condition associated with psoriasis. Use it when documentation links psoriatic disease to inflammation of the spine or sacroiliac joints.
Clinical signs
Common findings include chronic inflammatory back pain, stiffness, and reduced spinal mobility. Clinical features vary; refer to documentation for confirmed psoriatic involvement of the spine.
When to use this code
Use this code when the provider documents psoriatic spondylitis, axial psoriatic arthritis, or spinal involvement from psoriasis. It may also apply when imaging or specialist notes support psoriatic inflammation of the spine. Check documentation if the record only says back pain or psoriasis without a spinal diagnosis.
Do not use for
Do not use it for uncomplicated psoriasis, nonspecific low back pain, or other spondyloarthropathies without psoriatic attribution. Check documentation when the spinal diagnosis is unclear.
Coding tip
Code the condition only when the record clearly ties spinal disease to psoriasis; otherwise, query for clarification.