Final answer:
The appropriate ICD-10-CM code for Denny Maykowski's dog bite is S61.412A, representing an open bite of the right ankle, initial encounter.
Step-by-step explanation:
The appropriate ICD-10-CM code for Denny Maykowski's dog bite on his right ankle sustained during mail delivery duties for the U.S. Post Office is S61.412A.
The ICD-10-CM code S61.412A represents an open bite of the right ankle, initial encounter. The letter 'A' at the end indicates that this is the initial encounter for medical attention.
This code can be used by healthcare providers to accurately document and track the injury for medical and billing purposes.