Chiropractic Coding & Compliance Alert
Reader Question:
How to Interpret NEC and NOS in ICD-10
Published on Thu Nov 12, 2015 
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Question: I was looking at the ICD-10-CM manual, and I noticed NEC and NOS. I know they stand for Not Elsewhere Classifiable (NEC) and Not Otherwise Specified (NOS), but how should I use them in ICD-10-CM?
California Subscriber
Answer: Like ICD-9, the NEC (Not Elsewhere Classifiable) abbreviation contains codes for “other” types of specified conditions that haven’t already been classified. When your physician doesn’t clearly specify the condition, you can use a NOS (Not Otherwise Specified) code — although payers usually frown upon this process.
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