Some physicians in our area order PPSV23 every 5 years for their patients. Is this correct?

No. PPSV23 was never recommended to be given every 5 years. If you see a patient age 65 years or older who, as a result of this practice of repeating doses of PPSV23, has had multiple doses of PPSV23, evaluate their history of pneumococcal conjugate vaccination. If they have no or unknown history of any doses of PCV, administer a single dose of PCV15, PCV20, or PCV21 at least 1 year after their most recent dose of PPSV23. 

If they have also received a dose of PCV13 in the past, they may receive a dose of PCV20 or PCV21 at least 5 years after their most recent pneumococcal vaccination based on shared clinical decision-making.