Which of the following is NOT true about using GEMs to assign codes for patient encounters?
A) Doing so would be misuse of data.
B) There are very few exact one-to-one matches between ICD-9-CM and ICD-10- CM.
C) Forward mapping is taking ICD-10-CM codes and mapping them to the corresponding ICD-9-CM codes.
D) The GEMs were developed by CMS and the CDC.
Answer: C
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