Have the urologist select screening or diagnostic from the get-go. Consulting your urologists documentation is the only way youll know whether to code a screening or a diagnostic prostate specific antigen (PSA) test. Start your coding off on the right foot by putting the code right on the physicians order. Using a form like this one from Dan Rogers, administrator for Biloxi Bay Urology Center PLLC and Gulf South Urology in Biloxi, Miss., can help. This form has almost eliminated clinical errors in documenting screening versus diagnostic PSA tests for the practices he works with, Rogers says.