Answer: B
M81.0 is the correct code for this case because it codes for age-related osteoporosis without current pathological fracture which is the diagnosis in this patient.
Option A is not correct because M81.6 is used to code for localized osteoporosis.
Option C is not correct because M81.8 is used to code for other osteoporosis without current pathological fracture.
Option D is not correct because M83.2 is used to code for Adult osteomalacia due to malabsorption.