Question 2N9 Location specifity

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Elkhart, IN
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We have a physician that is documenting 2N9 for the location of a breast malignancy. They say it means that it is at the 2 o'clock position, 9 cm from the nipple. I have searched and cannot find any official guidance on this. Does someone know if this is an "official" location language and if so what is it? I am hoping to create something for our facility that we can use this terminology for coding specificity.
Thank you!
Monica Evans
 
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