See at a glance how codes match to lung anatomy. When your oncologist documents a lung neoplasm, can you picture the part of the anatomy she references? Understanding anatomy is a great way to take your coding to the next level. Use the anatomic drawing below to locate the site that your physician addressed. Then check out the sampling of applicable oncology-related ICD-9 codes in the chart at the bottom of this page. Remember: Always choose your code based on the documentation, and check both the index and tabular list to find the most appropriate code.