CPT Assistant does comment on coding the size but leaves it a bit gray as they do not come out and say "You must not" but more like "we frown upon" the coding the size from the path report. See below...
CPT® Assistant Detail
Article Detail
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Year: 2000
Issue: August
Pages: 5
Title: Review of the Integumentary Excision of Lesion Codes (11400-11646)
Body: Coding Communication
The Removal of a Lesion
To properly code an excision of a lesion, the physician must document the size and location of the lesion. The size of a lesion is measured by its clinical diameter for a circular or elliptical lesion. The diameter is the length of a straight line segment that passes through the center of a figure, especially of a circle or sphere, and terminates at the periphery. If the lesion is asymmetrical or irregular, the maximum width is used to measure the lesion. The physician should make an accurate measurement of the lesion at the time of the excision, and the size of the lesion should be documented in the operative report. A pathology report is less likely to contain an accurate measurement due to the shrinkage or fragmentation of the specimen. When coding the removal of a lesion, do not report the size of the surgical defect created or the affected area.