Looking up ICD-10 codes can help you understand your medical bills. You may need to look up an ICD-10 code if you're trying to sort out a medical pre-approval or billing issue with your health insurance provider. The International Classification of Diseases, Tenth Revision (ICD-10) is used by healthcare providers to classify and code every disease, symptom, and injury to submit insurance claims or prior authorizations . 1 The ICD-10 can often be found on patient reports or bills, but sometimes you have to look it up yourself. SDI Productions / Getty Images There are more than 70,000 ICD-10 codes, each with specific definitions. 1 This can make it challenging to look them up and find the right code. If the code is incorrect, the coverage or approval of a test or treatment may be denied. ICD-10 Code Lookup Look for the specific ICD-10 code on your medical records. If you can't find it, there are several other places you can search, including...