what is the appropriate icd 9 code

millortsui

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Atypical squmanous proliferation consistent with invasive well-defferentiated squamous cell carcinoma, associated with scar, present at margin.

Should I code it as 198.2 or 173.60?

Please advise.
 

hudiknight

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Sounds like the pathologist is calling it an invasive squamous cell and should be coded as such (173.xx). This was apparently an excision with a healed punch biopsy scar or re-excision where the squamous cell was still present at one margin.
 
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