MC915A

Indicates use of ICD-9 or ICD-10 code sets. Code sets cannot be mixed on a record.

9 = ICD-9 Diagnosis and procedure codes
0 = ICD-10 Diagnosis and procedure codes

The value in this field will be used in determining the code set to validate ICD diagnosis and procedure codes, e.g. MC041, MC042, MC058, etc. The ICD columns will fail validation if the values do match the code set specified by the ICD indicator flag.