Final answer:
The CPT code for the described surgery is 23615, and the ICD-10-CM code for the presented preoperative and postoperative diagnosis is S42.202A.
Step-by-step explanation:
For the operative report provided, the correct CPT (Current Procedural Terminology) code for open treatment of the left proximal humerus fracture with an implant is 23615. This code represents an open treatment of a proximal humeral fracture with a plate/screws, with or without cerclage. As for the ICD-10-CM (International Classification of Diseases, Tenth Revision, Clinical Modification) code, it would be S42.202A for an unspecified fracture of the upper end of the left humerus, initial encounter for the closed fracture.
These codes are used to describe the surgical procedure and fracture diagnosis and are crucial for medical billing and documentation. Due to the specificity of the codes, it is important for healthcare professionals to accurately report based on procedural details provided in operative reports.