Final answer:
The patient who was bitten by dogs while delivering mail should be assigned the codes W54.0XXA for a dog bite, Y99.0 as the activity code for a civilian working for income, Y92.480 to indicate the location on the street, and Y93.01 for walking. Therefore, the correct external cause codes are D. W54.0XXA, Y92.480, Y93.01, Y99.0.
Step-by-step explanation:
To assign the appropriate external cause codes for a patient who suffered extensive lacerations after being bitten by two dogs while delivering the mail as a postal service employee, we need to consider the specific codes from the International Classification of Diseases (ICD).
The accurate codes should reflect the nature of the injury, the activity the patient was engaged in when the injury occurred, and the location of the incident.
The first code, W54.0XXA, indicates being bitten by a dog, and the seventh character 'A' is used for an initial encounter.
As the patient was a postal worker on duty, we also include Y99.0, which indicates civilian activity done for income or pay.
Since the patient was bitten while walking on the sidewalk, the code Y92.480 is used to indicate the location as a street and highway.
Finally, Y93.01 is used for activities involving walking, marching and hiking. Therefore, the correct answer is D. W54.0XXA, Y92.480, Y93.01, Y99.0.