American Academy of Professional Coders (AAPC) Practice Exam

What is the annual growth rate of hair on the scalp, on average?

1. 3 inches

2. 6 inches

3. 9 inches

4. 12 inches

The correct answer is: 6 inches

The annual growth rate of hair on the scalp is typically around 6 inches. This figure is derived from studies and observations regarding hair biology, where it is noted that the average human scalp hair grows approximately half an inch per month. Over a year, this accumulates to about 6 inches, providing a clear and consistent average for hair growth rates in healthy individuals. In understanding hair growth, it's essential to recognize that various factors, such as genetics, age, health, and diet, can influence this rate. While some might experience faster or slower hair growth, the 6-inch average serves as a reliable benchmark for professional coding and documentation in medical and cosmetology fields. The other options represent growth rates that exceed the scientifically accepted average, making them less accurate in the context of typical hair growth expectations.