With over $70 on the line, don't risk submitting the wrong code or inadequate documentation. Even small practices are likely to have a Humphrey visual field analyzer, yet many ophthalmologists don't know the secrets for securing adequate reimbursement for these services -- and they even go so far as to put themselves at risk for costly audits due to lack of documentation. Stop Shortchanging Yourself With Intermediate Codes CPT lists three different visual field examinations -- and the higher the code, the higher the reimbursement.: Pitfall: The key to choosing the correct VF code is in the code descriptors themselves. For example, if the ophthalmologist plots only two isopters on the Goldmann perimeter, CPT would call that "intermediate," based on its description of 92082. If you plotted three isopters, however, that would be an "extended" examination that would qualify for 92083. Rule of thumb: "The bottom line is to document medical necessity for the level of visual field testing that is ordered," says Maggie M. Mac, CPC, CEMC, CHC, CMM, ICCE, Director, Best Practices-Network Operations at Mount Sinai Hospital in New York City. Document Now to Stop Headaches Later When you send in a CMS-1500 form, Medicare only sees the front part of the form. What Medicare doesn't see is what's on the other side of that form, which is your documentation. They assume that your documentation is correct until they do an audit. If Medicare does an audit and finds that your documentation is not in order, you could find yourself having to pay them back for all the claims they find problems with. That's why it's important to carefully document the medical necessity of the visual field exam in the patient's medical record and the workup findings that were performed and led a physician to suspect a diagnosis, thereby ordering the diagnostic testing, notes Mac. Following the diagnostic testing, one of the areas ophthalmologists are weak in is the "interpretation and report" portion of several codes, experts say. Code 92083 provides one example: Your record of a visual field states, "Informed patient test for OD showed small area we need to watch; have return in three months." In a postpayment audit, Medicare will not accept this as an adequate interpretation of the test results and complete report to support the billing. Why? "Interpretation and report" requires assessment of both eyes. Remember: Overkill? Not at all, stresses Mac. "A formal report is required whenever the professional component of diagnostic services are billed. And in the case of an audit, such a form will be necessary to support the work performed by the physician which constitutes formal documentation of an interpretation and report."