See how this list compares to your own reporting statistics. If you want to keep your practice's finances in the black, accurately reporting your most frequently reported codes correctly is a must. As an example of where to focus, this table shows the top 10 codes (by frequency) reported to the CMS database in 2009 by providers identifying themselves as hematologist/oncologists, hematologists, and medical oncologists. Your top 10 may look different, depending on what your practice offers. Hint: