The list of _revincludes for the Organization Resource repeats for InsurancePlan:plan-network. From looking at the balloted version, InsurancePlan:network is missing.

https://build.fhir.org/ig/HL7/fhir-us-ndh/CapabilityStatement-national-directory-api-server.html#search-5 

Supported Reverse-Includes: CareTeam:organization, Endpoint:organization, HealthcareService:organization, HealthcareService:new-patient-from-network, HealthcareService:network, InsurancePlan:administered-by, InsurancePlan:owned-by, InsurancePlan:coverage-network, InsurancePlan:plan-network, InsurancePlan:plan-network, Location:organization, Location:new-patient-from-network, OrganizationAffiliation:network, OrganizationAffiliation:participating-organization, OrganizationAffiliation:primary-organization, Practitioner:qualification-issuer, PractitionerRole:organization, PractitionerRole:network, PractitionerRole:new-patient-from-network

Either remove the duplicate or correct it to be the proper revinclude.