The switch from ICD-9 (17,000 codes) to ICD-10 (141,000 codes) will have a huge impact on physician practices.  Use this online translatorto see how your most commonly used codes will make out in this transition. 

Types of changes you will see:

Approximate Match: Diagnosis has a direct 1-1 mapping, but the diagnosis text has changed slightly (about 49% of new codes)
Exact Match:Diagnosis has a direct 1-1 mapping and the diagnosis text remains the same (about 24% of new codes)
Match with Multiple Choices:Diagnosis maps to a set of diagnoses, from which one should be chosen (about 19% of new codes)
No Mapping:Diagnosis does not exist in the ICD-10 code set (about 3% of new codes)
Complex Mapping: Diagnosis matches to multiple sets of ICD-10 diagnoses (about 3% of new codes)
1 to Many:1 Diagnosis code maps to 2 or more ICD-10 codes (about 2% of new codes)