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Source 1: 2007 MP/H Rules
MP/H Rules/Multiple primaries--Urinary: For the Urinary Multiple Primary rules, why aren't topography codes C681-C689 included in rule M8? See discussion.
For example, if a patient has papillary transitional cell carcinoma of the bladder and ureter in 2010 (C68.9) and then has a diagnosis of transitional cell carcinoma of the renal pelvis (C65.9) in 2012, then you would pass through the MP rules until you got to M9 or M10 -- either of which indicates that these are multiple primaries. Is that correct for coding urinary primaries?
Rule M8 was written specifically for urothelial tumors in the renal pelvis, ureter, bladder, and urethra. Paraurethral gland (C681) and overlapping lesions of urinary organs (C688) do not belong in rule M8.
When C689 is assigned because tumors of the bladder and tumors of the ureter were determined to be a single primary and the site of origin is not known (as in your example), it makes sense to apply rule M8 when a subsequent tumor is diagnosed in one of the listed sites. However, if C689 is assigned for other unknown primary site situations, rule M8 should not be used.
We will add this issue to the list of possible revisions for the next edition of the MP/H rules.