“Chronic pain syndrome” can be considered as a vague description of a vague diagnosis by your carrier and unless you back up your medical billing with the reasons for using this catchall term for several pain conditions, you may be seeing only partial reimbursements to denials for this condition. Traditionally, ICD-9 directs you to code 338.4 (Chronic pain syndrome) for the condition. However, you may need to couple this diagnosis with other probable causes backed up by symptoms and doctor’s notes. Other diagnosis possibilities for chronic pain syndrome include fibromyalgia/muscular pain (729.1, Myalgia and myositis, unspecified); reflex sympathetic dystrophy/regional pain syndrome (337.2x, Reflex sympathetic dystrophy) or peripheral neuropathy (337.0, Idiopathic …