A leaflet at a running shop might say: "Pain on the outside of your knee is your IT band." The sentence is short, confident and easy to repeat.
Read it the way a contract gets read: check what the claim covers, mark the small words that are easy to skip, and put your questions in writing before agreeing to a plan in Passaic.
The sentence on the leaflet
Wikipedia states: "Iliotibial band syndrome is one of the leading causes of lateral knee pain in runners." Read literally, the sentence says "one of the leading causes". It does not say "the cause". It also names a group, runners, and a location, the outer knee, so it describes a pattern and not any one person's knee.
For a broader view, a general sports injuries overview lists types, symptoms and risk factors in one place.
What "associated with" means for a runner
Wikipedia also states: "ITBS is associated with various risk factors including training habits, anatomical abnormalities, or muscular imbalances". ITBS is the abbreviation that source uses for iliotibial band syndrome.
The verb is "associated with", which is weaker than "caused by". The excerpt lists three kinds of factor and does not rank them. It does not say which one applies to which runner.
Which sentence in the plan depends on the diagnosis
A diagnosis label and a treatment plan are two separate pieces of paperwork. When a plan names iliotibial band syndrome, a reader can ask which sentence in the plan depends on that label, and what changes if the label is wrong.
A general pain management overview lists types, benefits and risks. That gives a reader a vocabulary to hold against a plan's wording.
The small words that carry the promise
In paperwork the verb decides the promise. "Is" commits. "Can" and "may" permit. "Is associated with" describes a link and promises no outcome. "One of" leaves room for other causes.
Check whether a brochure or form in Passaic keeps those small words or drops them.
Three things to ask for in writing
Before agreeing to anything tied to this label, ask for three things in writing. First, the sentence that names the diagnosis, and the source it relies on. Second, any exclusion or condition attached to the plan. Third, what the plan says happens if the label turns out to be wrong.
A second overview of sports injuries from a different publisher is a fair place to compare wording. Settling any single knee belongs with the clinician who examines it.