diff --git a/.circleci/config.yml b/.circleci/config.yml
index 696fa5fd2d..91c281e711 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -31,3 +31,6 @@ jobs:
       - run:
           name: Test
           command: yarn test
+      - run:
+          name: report-coverage
+          command: yarn codecov
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000000..1beb17b8de
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,15 @@
+codecov:
+  notify:
+    require_ci_to_pass: no
+comment:
+  layout: "header, changes, diff, files"
+  behavior: default
+coverage:
+  status:
+    patch:
+      default:
+        target: 80%
+    project:
+      default:
+        target: auto
+        threshold: 1%
diff --git a/packages/opentelemetry-core/package.json b/packages/opentelemetry-core/package.json
index 6195a5452e..2be955b005 100644
--- a/packages/opentelemetry-core/package.json
+++ b/packages/opentelemetry-core/package.json
@@ -6,7 +6,7 @@
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
   "scripts": {
-    "test": "nyc ts-mocha -p ./tsconfig.json test/**/*.ts",
+    "test": "nyc ts-mocha -p tsconfig.json test/**/*.ts",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "codecov": "nyc report --reporter=json && codecov -f coverage/*.json",
     "clean": "rimraf build/*",
@@ -35,6 +35,17 @@
     "LICENSE",
     "README.md"
   ],
+  "nyc": {
+    "extension": [
+      ".ts"
+    ],
+    "exclude": [
+      "src/index.ts",
+      "**/*.d.ts",
+      "build/**/**/*.js"
+    ],
+    "all": true
+  },
   "publishConfig": {
     "access": "public"
   },