Final answer:
The standard for ethical coding practices for high-quality healthcare data is 100% accuracy and completeness.
Step-by-step explanation:
According to the standards of ethical coding, the quarter supply for accurate and complete coding practices for the production of high-quality healthcare data is 100%. This means that all healthcare data coding should be done with full accuracy, without leaving out any information, as healthcare decisions and treatments rely heavily on data quality. An ethical coding practice must aim to eliminate errors and inaccuracies entirely, which correlates to option 4) 100%.