I got the following email from UMLS. I wonder if this affects the CPT4 utility to resolve the concept names.
You are receiving this email from the U.S. National Library of Medicine because you have used a username and password to authenticate with an API that relies on UMLS Terminology Services (UTS) authentication (https://documentation.uts.nlm.nih.gov/rest/authentication.html). We are contacting you because effective immediately, we are deprecating username and password authentication for all APIs that rely on UTS authentication. Instead, we will require you to authenticate using an API key. APIs that rely on UTS authentication include:
UMLS API: https://documentation.uts.nlm.nih.gov/
VSAC SVS API: https://www.nlm.nih.gov/vsac/support/usingvsac/vsacsvsapiv2.html
FHIR® Terminology Service for VSAC Resources: https://cts.nlm.nih.gov/fhir/
RxNorm Proprietary Information API: https://rxnav.nlm.nih.gov/RxNormAPIs.html#uLink=RxNorm_REST_getProprietaryInformation
AccessGUDID SNOMED Device and Implantable List APIs: https://accessgudid.nlm.nih.gov/resources/developers/generating_umls_tickets
We recommend that you switch to using an API key as soon as possible. We anticipate that these APIs will no longer accept username and password starting January 1, 2021.