Forgive me for stepping in as a non-private practice (yet) guy, but I have looked into this somewhat over the last couple of years. I am on vacation so I don't have my codes in front of me, but I remember most of the basics of billing for ultrasound.
First print a picture every time and place it with the anesthesia record. It doesn't have to be a great picture, just something to use as proof that you used an ultrasound on that block/ vascular access procedure. Put a patient sticker on it. Some people advocate labeling what is visible in the picture. That is probably overkill, but might save you some headache in an audit.
For the block itself I use the 644** codes with a modifier 59. The 644** codes are for the block and 10 days of management. While they theoretically show that the block is a separate procedure from the operative anesthetic (even if the operative anesthetic is MAC), it doesn't hurt to throw on the modifier 59 to reinforce that the block is a distinct procedural service from the operative anesthetic.
You should then code for the ultrasound guidance and interpretation. The 769** codes that xyzdoc listed are correct. However, if the procedure is done in a hospital or ASC etc you should add a modifier 26 to the ultrasound procedure code. Reimbursement for ultrasound in this setting is assumed by payers to be bundled into the hospital fee and they can deny payment for the ultrasound portion on this basis. By adding a modifier 26, you are indicating that you are billing for the professional interpretation of the obtained ultrasound image, not for obtaining the image itself. If you were to use an ultrasound in your office for vascular access etc, you would not need to use the modifier 26.
So for an intrascalene catheter your coding might look something like this.
Diagnosis - 719.41 Severe post-operative right shoulder pain
Procedures - 64416 -59 placement of brachial plexus infusion catheter
76942 -26 Professional interpretation of ultrasound image for catheter placement.
Most of the ultrasound companies are highly motivated to teach proper billing to maximize your income and the likelihood that you will buy/use their ultrasound. Here is a link to GE's booklet on the subject.
reimbursement_anesthesiology_2.25.09.pdf
I bet that sonosite and phillips have a booklets like this too.
Hope that helps
- pod
disclaimer. At this point I only play around with this stuff and my knowledge is primarily theoretical. I welcome any criticism from the guys who are billing and dealing with insurance every day because I would like to learn as much as possible about billing.