What is the principal ICD-10-CM diagnosis code for a 10-year-old patient with acute mastoiditis?

• A. H70.001
• B. H70.002
• C. H70.003
• D. H70.004

Answer: (B)

The correct choice for the principal ICD-10-CM diagnosis code for a 10-year-old patient with acute mastoiditis is H70.002. This specific code is designated for acute mastoiditis without complications in a patient who is not specified as newborn or infant, which aligns with the details about the 10-year-old patient in the scenario.

In ICD-10-CM coding, each code is structured to indicate a specific condition and the circumstances surrounding it, such as severity or patient demographics. The first part of the code (H70) indicates it pertains to mastoiditis, and the subsequent portion (.002) specifies the acuity and absence of complications. Therefore, when coding for this condition, it is important to select the code that accurately reflects both the diagnosis and the age group of the patient.

Other codes in the same range indicate different complications or variations of mastoiditis, making them less appropriate for this case. Understanding the nuances of these codes is crucial for accurate medical coding, which in turn impacts billing and health record keeping.