ICD-9 refers to the International Classification of Diseases (ninth edition). This is an international system used to code and categorise medical conditions. They are often also used for the process of medical billing.
There are two codes in ICD-9 which relate to pulmonary fibrosis:
1) Idiopathic Pulmonary Fibrosis (IPF)
Code: 516.31
2) Post-inflammatory Pulmonary Fibrosis
Code: 515
