31231 with E/M visit
2014 Optum "Coder's Desk Reference Procedures" describes 31231 as follows: "The physician uses an endoscope for a diagnostic evaluation of the nose. An endoscope has a rigid fiberoptic telescope that allows the physician both increased visualization and magnification of internal anatomy. Topical vasoconstrictive agents are applied to the nasal mucosa and nerve blocks with local anesthesia are performed. The endoscope is placed into the nose and thorough inspection of internal nasal structures is accomplished. No surgical procedure is performed."
Document: pre-procedure diagnosis and reason for procedure, all the usual possible complications, etc. Document size of scope, type of scope, whether done bilaterally or unilaterally, name of vasoconstrictive agents and or medication for nerve block if done. Describe normal and abnormal findings of nasal structures such as septum, turbinates, mucosa, etc. Indicate how procedure was tolerated and if any complications occurred. Document post procedure diagnosis.
It sounds like you are asking if an E/M visit can be billed with this procedure. Read about modifier 25 in your CPT book. There must be adequate documentation of the office visit to specify that a significantly separate identifiable evaluation and management service was provided above and beyond the endoscopy. If an identifiable E/M service is documented it should be billed with a 25 modifier to indicate this.
In other words, if the only reason the patient came to the office was the endoscopy and no separate E/M services were provided, only the endoscopy can be billed.
Hope this helps.