Final answer:
The appropriate CPT® code to report is 31605 and the ICD-10-CM code is T17.0XXA for the emergency transtracheal tracheostomy performed on an 18-month-old patient in the ED due to a toy lodged in his throat.
Step-by-step explanation:
For the emergency transtracheal tracheostomy performed on an 18-month-old patient in the ED due to a toy lodged in his throat, the appropriate codes to report are as follows:
CPT® Code: 31605 - Tracheostomy, open; emergency procedure, neonatal or pediatric (younger than 2 years old)
ICD-10-CM Code: T17.0XXA - Foreign body in pharynx causing other injury, initial encounter
It's important to note that the specific codes may vary depending on the documentation and circumstances of the procedure, so consulting the official coding guidelines is recommended.