diff --git a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs
index 43eda36..d2d4e7b 100644
--- a/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs
+++ b/Polyclinic/PolyclinicBusinessLogic/BusinessLogics/DiagnoseLogic.cs
@@ -1,35 +1,109 @@
-using PolyclinicContracts.BindingModels;
+using Microsoft.Extensions.Logging;
+using PolyclinicContracts.BindingModels;
 using PolyclinicContracts.BusinessLogicsContracts;
 using PolyclinicContracts.SearchModels;
+using PolyclinicContracts.StoragesContracts;
 using PolyclinicContracts.ViewModels;
 
 namespace PolyclinicBusinessLogic.BusinessLogics
 {
     public class DiagnoseLogic : IDiagnoseLogic
     {
+        private ILogger _logger;
+        private IDiagnoseStorage _diagnoseStorage;
+
+        public DiagnoseLogic(ILogger logger, IDiagnoseStorage diagnoseStorage)
+        {
+            _logger = logger;
+            _diagnoseStorage = diagnoseStorage;
+        }
+
         public bool Create(DiagnoseBindingModel model)
         {
-            throw new NotImplementedException();
+            CheckModel(model);
+            if (_diagnoseStorage.Insert(model) == null)
+            {
+                _logger.LogWarning("Insert operation failed");
+                return false;
+            }
+            return true;
         }
 
         public bool Delete(DiagnoseBindingModel model)
         {
-            throw new NotImplementedException();
+            CheckModel(model, false);
+            _logger.LogInformation("Delete. Name:{Name}, Id:{Id}", model.Name, model.Id);
+            if (_diagnoseStorage.Delete(model) == null)
+            {
+                _logger.LogWarning("Delete operation failed");
+                return false;
+            }
+            return true;
         }
 
         public DiagnoseViewModel? ReadElement(DiagnoseSearchModel model)
         {
-            throw new NotImplementedException();
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            _logger.LogInformation("ReadElement. Name:{Name}, Id:{Id}, UserId:{UserId}", model.Name, model.Id, model.UserId);
+            var element = _diagnoseStorage.GetElement(model);
+            if (element == null)
+            {
+                _logger.LogWarning("ReadElement element not found");
+                return null;
+            }
+            _logger.LogInformation("ReadElement find. Name:{Name}, Id:{Id}, UserId:{UserId}", element.Name, element.Id, element.UserId);
+            return element;
         }
 
         public List<DiagnoseViewModel>? ReadList(DiagnoseSearchModel? model)
         {
-            throw new NotImplementedException();
+            _logger.LogInformation("ReadList. Name:{Name} Id:{Id}, UserId:{UserId}", model?.Name, model?.Id, model?.UserId);
+            var list = model == null ? _diagnoseStorage.GetFullList() : _diagnoseStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                _logger.LogWarning("ReadList return null list");
+                return null;
+            }
+            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
+            return list;
         }
 
         public bool Update(DiagnoseBindingModel model)
         {
-            throw new NotImplementedException();
+            CheckModel(model);
+            if (_diagnoseStorage.Update(model) == null)
+            {
+                _logger.LogWarning("Update operation failed");
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(DiagnoseBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Name))
+            {
+                throw new ArgumentNullException("Нет названия болезни", nameof(model.Name));
+            }
+            _logger.LogInformation("Diagnose. Name:{Name}. Id: {Id}", model.Name, model.Id);
+            var element = _diagnoseStorage.GetElement(new DiagnoseSearchModel
+            {
+                Name = model.Name
+            });
+            if (element != null && element.Id != model.Id)
+            {
+                throw new InvalidOperationException("Болезнь с таким названием уже есть");
+            }
         }
     }
 }
diff --git a/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs b/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
index da88efa..cc2711c 100644
--- a/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
+++ b/Polyclinic/PolyclinicContracts/SearchModels/DiagnoseSearchModel.cs
@@ -3,6 +3,7 @@
     public class DiagnoseSearchModel
     {
         public int? Id { get; set; }
+        public string? Name { get; set; }
         public int? UserId { get; set; }
     }
 }