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I've never come across a separate code for "contract signed"...when I first read the question I was thinking you meant CPT code, but now sounds like you meant ICD. If physician documents chronic pain, there are codes in the 338 set for that; otherwise use whatever acute pain is documented.
I have to agree with Meagan, if the reason for the encounter was sign a contract for treatment of chronic pain then the 338.2- code is your first listed code.. I would suggest reading the guidelines for coding visits for pain management.