<status value="retired"/> <experimental value="false"/> <date value="2021-11-09T10:00:00+10:00"/> <publisher value="TBD - External Body"/> <description value="The United States Environmental Protection Agency's (US EPA) Substance Registry System (SRS) provides information on substances and how they are represented in US environmental statutes, in US EPA information systems, and in information systems owned by other organizations. The SRS provides standardized identification for each substance to improve data quality in US EPA systems and elsewhere."/> <caseSensitive value="true"/> <content value="not-present"/> </CodeSystem>

This code system http://terminology.hl7.org/CodeSystem/usEPAsrs defines many codes, but they are not represented here