What is the ICD-10 code to use for an unspecified lump in the right breast identified at the 9:00 position? The 9:00 position is not in one of the four quadrants nor is it in the axillary tail or subareolar locations.


The appropriate diagnosis for unspecified lump in right breast identified at 9:00 position is N63.10 (unspecified lump in the right breast, unspecified quadrant).

Since the diagnosis codes are described by quadrant, not clock position, physicians should be asked to document by quadrant. Letting the physician know that documenting by clock position can result in denied claims should help them understand why you are requesting this reference change.

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