diff --git a/app/services/sign_in/attribute_validator.rb b/app/services/sign_in/attribute_validator.rb
index f1e3ad3b2db..93ace517b5a 100644
--- a/app/services/sign_in/attribute_validator.rb
+++ b/app/services/sign_in/attribute_validator.rb
@@ -176,7 +176,10 @@ def handle_error(error_message, error_code, error: nil)
 
     def mpi_response_profile
       @mpi_response_profile ||=
-        if idme_uuid
+        if mhv_correlation_id
+          mpi_service.find_profile_by_identifier(identifier: mhv_correlation_id,
+                                                 identifier_type: MPI::Constants::MHV_UUID)&.profile
+        elsif idme_uuid
           mpi_service.find_profile_by_identifier(identifier: idme_uuid,
                                                  identifier_type: MPI::Constants::IDME_UUID)&.profile
         elsif logingov_uuid
diff --git a/lib/mpi/constants.rb b/lib/mpi/constants.rb
index 194d904ed8b..e312971942a 100644
--- a/lib/mpi/constants.rb
+++ b/lib/mpi/constants.rb
@@ -23,6 +23,7 @@ module Constants
 
     IDME_FULL_IDENTIFIER = 'PN^200VIDM^USDVA^A'
     LOGINGOV_FULL_IDENTIFIER = 'PN^200VLGN^USDVA^A'
+    MHV_FULL_IDENTIFIER = 'PI^200MHS^USVHA^A'
     DSLOGON_FULL_IDENTIFIER = 'NI^200DOD^USDOD^A'
 
     ACTIVE_VHA_IDENTIFIER = 'USVHA^A'
@@ -42,6 +43,6 @@ module Constants
     FIND_PROFILE_BY_ATTRIBUTES_ORCH_SEARCH_TYPE = 'find_profile_by_attributes_orch_search'
     FIND_PROFILE_BY_FACILITY_TYPE = 'find_profile_by_facility'
 
-    QUERY_IDENTIFIERS = [ICN = 'ICN', IDME_UUID = 'idme', LOGINGOV_UUID = 'logingov'].freeze
+    QUERY_IDENTIFIERS = [ICN = 'ICN', IDME_UUID = 'idme', LOGINGOV_UUID = 'logingov', MHV_UUID = 'mhv'].freeze
   end
 end
diff --git a/lib/mpi/messages/find_profile_by_identifier.rb b/lib/mpi/messages/find_profile_by_identifier.rb
index 426f4ab22f8..157efe37caa 100644
--- a/lib/mpi/messages/find_profile_by_identifier.rb
+++ b/lib/mpi/messages/find_profile_by_identifier.rb
@@ -39,6 +39,8 @@ def correlation_identifier
           "#{identifier}^#{Constants::IDME_FULL_IDENTIFIER}"
         when Constants::LOGINGOV_UUID
           "#{identifier}^#{Constants::LOGINGOV_FULL_IDENTIFIER}"
+        when Constants::MHV_UUID
+          "#{identifier}^#{Constants::MHV_FULL_IDENTIFIER}"
         end
       end
 
diff --git a/spec/lib/mpi/messages/find_profile_by_identifier_spec.rb b/spec/lib/mpi/messages/find_profile_by_identifier_spec.rb
index 32bcdc822c1..716250df50f 100644
--- a/spec/lib/mpi/messages/find_profile_by_identifier_spec.rb
+++ b/spec/lib/mpi/messages/find_profile_by_identifier_spec.rb
@@ -72,6 +72,13 @@
       it_behaves_like 'successfully built request'
     end
 
+    context 'when identifier type is MHV_UUID' do
+      let(:identifier_type) { MPI::Constants::MHV_UUID }
+      let(:expected_identifier) { "#{identifier}^#{MPI::Constants::MHV_FULL_IDENTIFIER}" }
+
+      it_behaves_like 'successfully built request'
+    end
+
     context 'when identifier type is an arbitrary value' do
       let(:identifier_type) { 'some-identifier-type' }
       let(:expected_error_message) { "Identifier type is not supported, identifier_type=#{identifier_type}" }
diff --git a/spec/services/sign_in/attribute_validator_spec.rb b/spec/services/sign_in/attribute_validator_spec.rb
index e3de8457ad3..d5fa9af27b5 100644
--- a/spec/services/sign_in/attribute_validator_spec.rb
+++ b/spec/services/sign_in/attribute_validator_spec.rb
@@ -67,10 +67,15 @@
       let(:add_person_response) { 'some-add-person-response' }
       let(:find_profile_response) { 'some-find-profile-response' }
       let(:update_profile_response) { 'some-update-profile-response' }
+      let(:identifier) { idme_uuid }
+      let(:identifier_type) { MPI::Constants::IDME_UUID }
 
       before do
         allow_any_instance_of(MPI::Service).to receive(:add_person_implicit_search).and_return(add_person_response)
-        allow_any_instance_of(MPI::Service).to receive(:find_profile_by_identifier).and_return(find_profile_response)
+        allow_any_instance_of(MPI::Service)
+          .to receive(:find_profile_by_identifier)
+          .with(identifier:, identifier_type:)
+          .and_return(find_profile_response)
         allow_any_instance_of(MPI::Service).to receive(:update_profile).and_return(update_profile_response)
         allow(Rails.logger).to receive(:info)
       end
@@ -361,6 +366,8 @@
         let(:address) { nil }
         let(:mhv_correlation_id) { 'some-mhv-correlation-id' }
         let(:email) { 'some-email' }
+        let(:identifier) { mhv_correlation_id }
+        let(:identifier_type) { MPI::Constants::MHV_UUID }
 
         context 'and credential is missing mhv icn' do
           let(:mhv_icn) { nil }
@@ -485,6 +492,8 @@
         let(:country) { 'USA' }
         let(:birth_date) { '1930-01-01' }
         let(:email) { 'some-email' }
+        let(:identifier) { logingov_uuid }
+        let(:identifier_type) { MPI::Constants::LOGINGOV_UUID }
 
         context 'and credential is missing email' do
           let(:email) { nil }
@@ -606,6 +615,8 @@
         let(:ssn) { '444444758' }
         let(:birth_date) { '1930-01-01' }
         let(:email) { 'some-email' }
+        let(:identifier) { idme_uuid }
+        let(:identifier_type) { MPI::Constants::IDME_UUID }
 
         context 'and credential is missing email' do
           let(:email) { nil }
@@ -662,6 +673,8 @@
         let(:country) { 'USA' }
         let(:birth_date) { '1930-01-01' }
         let(:email) { 'some-email' }
+        let(:identifier) { idme_uuid }
+        let(:identifier_type) { MPI::Constants::IDME_UUID }
 
         context 'and credential is missing email' do
           let(:email) { nil }