NYPD officers contribute to Social Security same as any other profession. You need 40 credits to qualify for social security so as long as you work 20 years with the NYPD and attain age 62 you can receive social security benefits. read more
New York State Retirement and Social Security Law (RSSL) § 645 (“aka” Chapter 646 of the Laws of 1999) allows you to buyback your previous service and “tier reinstate” to a Tier based on the original date of membership in your previous retirement system. read more