Propose a detailed, step-by-step mechanism for the reaction pathway shown below. 
Definitions:
Coding Accuracy
The degree to which coding in data entry or programming is free from errors.
International Public Health
The branch of health care that deals with the prevention and control of diseases, as well as the promotion of health at a global scale.
Unique Code
A specific identifier assigned to an individual or item, used for tracking, identification, and security purposes.
Different Procedures
Various techniques or methods employed in medical treatment, diagnosis, or surgery.
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