diff --git a/index.js b/index.js
index 426442093c..384d31af0b 100644
--- a/index.js
+++ b/index.js
@@ -5,6 +5,8 @@
 
 'use strict'
 
+const HealthReporter = require('./lib/health-reporter')
+
 // Record opening times before loading any other files.
 const preAgentTime = process.uptime()
 const agentStart = Date.now()
@@ -156,6 +158,7 @@ function createAgent(config) {
       'New Relic requires that you name this application!\n' +
       'Set app_name in your newrelic.js or newrelic.cjs file or set environment variable\n' +
       'NEW_RELIC_APP_NAME. Not starting!'
+    agent.healthReporter.setStatus(HealthReporter.STATUS_MISSING_APP_NAME)
     throw new Error(message)
   }
 
@@ -169,6 +172,7 @@ function createAgent(config) {
 
   agent.start(function afterStart(error) {
     if (error) {
+      agent.healthReporter.setStatus(HealthReporter.STATUS_INTERNAL_UNEXPECTED_ERROR)
       const errorMessage = 'New Relic for Node.js halted startup due to an error:'
       logger.error(error, errorMessage)
 
diff --git a/lib/health-reporter.js b/lib/health-reporter.js
index 1b5b8a5af9..918903ff1e 100644
--- a/lib/health-reporter.js
+++ b/lib/health-reporter.js
@@ -23,7 +23,9 @@ const VALID_CODES = new Map([
   ['NR-APM-008', 'Agent is disabled via configuration.'],
   ['NR-APM-009', 'Failed to connect to the New Relic data collector.'],
   ['NR-APM-010', 'Agent config could not be parsed.'],
-  ['NR-APM-099', 'Agent has shutdown.']
+  ['NR-APM-099', 'Agent has shutdown.'],
+  // Codes 300 through 399 are reserved for the Node.js Agent.
+  ['NR-APM-300', 'An unexpected error occurred.']
 ])
 
 function writeStatus({ file, healthy = true, code, msg, startTime, callback } = {}) {
@@ -65,6 +67,9 @@ class HealthReporter {
   static STATUS_CONFIG_PARSE_FAILURE = 'NR-APM-010'
   static STATUS_AGENT_SHUTDOWN = 'NR-APM-099'
 
+  // STATUS_INTERNAL errors are the Node.js Agent specific error codes.
+  static STATUS_INTERNAL_UNEXPECTED_ERROR = 'NR-APM-300'
+
   constructor({ logger = defaultLogger, setInterval = global.setInterval } = {}) {
     const fleetId = process.env.NEW_RELIC_SUPERAGENT_FLEET_ID
     const outDir = process.env.NEW_RELIC_SUPERAGENT_HEALTH_DELIVERY_LOCATION
@@ -135,7 +140,6 @@ class HealthReporter {
     }
 
     if (VALID_CODES.has(status) === false) {
-      // TODO: if we ever add codes in our reserved block (300-399), account for them here
       this.#logger.warn(`invalid health reporter status provided: ${status}`)
       return
     }
diff --git a/test/unit/index.test.js b/test/unit/index.test.js
index ca3a4c3199..99a4ecd3d6 100644
--- a/test/unit/index.test.js
+++ b/test/unit/index.test.js
@@ -7,9 +7,11 @@
 
 const test = require('node:test')
 const assert = require('node:assert')
+const tspl = require('@matteo.collina/tspl')
 
 const sinon = require('sinon')
 
+const HealthReporter = require('../../lib/health-reporter')
 const proxyquire = require('proxyquire').noCallThru()
 const createLoggerMock = require('./mocks/logger')
 const createMockAgent = require('./mocks/agent')
@@ -322,30 +324,52 @@ test('index tests', async (t) => {
     )
   })
 
-  await t.test('should throw error is app name is not set in config', (t) => {
+  await t.test('should throw error is app name is not set in config', async (t) => {
+    const plan = tspl(t, { plan: 3 })
+    const setStatus = HealthReporter.prototype.setStatus
+    HealthReporter.prototype.setStatus = (status) => {
+      plan.equal(status, HealthReporter.STATUS_MISSING_APP_NAME)
+    }
+    t.after(() => {
+      HealthReporter.prototype.setStatus = setStatus
+    })
+
     t.nr.processVersionStub.satisfies.onCall(0).returns(true)
     t.nr.processVersionStub.satisfies.onCall(1).returns(false)
     t.nr.mockConfig.applications.returns([])
     loadIndex(t)
-    assert.equal(t.nr.loggerMock.error.callCount, 1, 'should log an error')
-    assert.match(
+    plan.equal(t.nr.loggerMock.error.callCount, 1, 'should log an error')
+    plan.match(
       t.nr.loggerMock.error.args[0][0].message,
       /New Relic requires that you name this application!/
     )
+
+    await plan.completed
   })
 
-  await t.test('should log error if agent startup failed', (t) => {
+  await t.test('should log error if agent startup failed', async (t) => {
+    const plan = tspl(t, { plan: 3 })
+    const setStatus = HealthReporter.prototype.setStatus
+    HealthReporter.prototype.setStatus = (status) => {
+      plan.equal(status, HealthReporter.STATUS_INTERNAL_UNEXPECTED_ERROR)
+    }
+    t.after(() => {
+      HealthReporter.prototype.setStatus = setStatus
+    })
+
     t.nr.processVersionStub.satisfies.onCall(0).returns(true)
     t.nr.processVersionStub.satisfies.onCall(1).returns(false)
     t.nr.mockConfig.applications.returns(['my-app-name'])
     const err = new Error('agent start failed')
     t.nr.MockAgent.prototype.start.yields(err)
     loadIndex(t)
-    assert.equal(t.nr.loggerMock.error.callCount, 1, 'should log a startup error')
-    assert.equal(
+    plan.equal(t.nr.loggerMock.error.callCount, 1, 'should log a startup error')
+    plan.equal(
       t.nr.loggerMock.error.args[0][1],
       'New Relic for Node.js halted startup due to an error:'
     )
+
+    await plan.completed
   })
 
   await t.test('should log warning if not in main thread and make a stub api', (t) => {
diff --git a/test/unit/mocks/agent.js b/test/unit/mocks/agent.js
index 31100d18a2..4bb39d447c 100644
--- a/test/unit/mocks/agent.js
+++ b/test/unit/mocks/agent.js
@@ -4,9 +4,11 @@
  */
 
 'use strict'
+
 const { EventEmitter } = require('events')
 const util = require('util')
 const sinon = require('sinon')
+const HealthReporter = require('../../../lib/health-reporter')
 
 module.exports = (sandbox = sinon, metricsMock) => {
   function MockAgent(config = {}) {
@@ -14,6 +16,7 @@ module.exports = (sandbox = sinon, metricsMock) => {
     this.config = config
     this.config.app_name = 'Unit Test App'
     this.metrics = metricsMock
+    this.healthReporter = new HealthReporter()
   }
   MockAgent.prototype.start = sandbox.stub()
   MockAgent.prototype.recordSupportability = sandbox.stub()