The "Health Tech Investment Act" seeks to update Medicare payment policies for innovative algorithm-based healthcare services. It amends the Social Security Act to ensure that certain algorithm-based healthcare services , when provided in outpatient departments, are assigned to a new technology ambulatory payment classification based on comprehensive manufacturer-submitted cost data. This classification must be maintained for a minimum of five years, or until sufficient claims data allows for reassignment, preventing premature removal from appropriate payment categories. The legislation also directs the Secretary to adjust the eligibility criteria for new technology ambulatory payment classifications. This adjustment will ensure that algorithm-based services that are distinct but performed alongside or as part of other procedures, and require additional resources, can qualify for appropriate payment. Furthermore, the bill codifies the existing hospital outpatient prospective payment system policy for software as a service , making it effective for services provided from January 1, 2023.