What kind of doctor can treat diffuse idiopathic skeletal hyperostosis?

DISH: DISH should be treated by a rheumatologist and an orthopaedic surgeon. https://rarediseases.info.nih.gov/gard/6460/diffuse-idiopathic-skeletal-hyperostosis/resources/1

Diagnosis first: First, make sure that the diagnosis is DISH and not the more treatable disease, ankylosing spondylitis. Diagnosis is usually done by a rheumatologist or an orthopedic surgeon or a spine surgeon. Unfortunately, DISH treatment is limited but can involve other health providers such as physical therapists.