P
AI for Benefits Administrator

Custom GPT: Build a Benefits Q&A Assistant for Your Employees

(Or Your HR Team's Internal Lookup Tool)

Tools: ChatGPT Plus (Custom GPT builder) | Time to build: 1-2 hours | Difficulty: Intermediate-Advanced Prerequisites: Comfortable using ChatGPT for drafting tasks — see Level 3 guide: "Generate Your Full Open Enrollment Communication Package"

What This Builds

A Custom GPT is a version of ChatGPT you've configured specifically for your employer's benefits — trained on your actual plan documents, given instructions for how to answer questions, and able to be shared with your HR team (or with employees, if you choose). Instead of spending 10 minutes looking up an answer in a PDF, anyone on your team can ask the GPT: "Is behavioral health therapy covered for in-network providers, and what's the visit limit?" and get an accurate, document-grounded answer in 5 seconds. During open enrollment, it handles the volume surge without adding to your workload.

Prerequisites

  • A ChatGPT Plus account (chat.openai.com — $20/month)
  • Your plan documents in PDF format: SPD, SBC for each health plan, dental and vision summaries
  • 30–60 minutes to write the configuration instructions
  • Time to build: 1-2 hours total
  • Cost: ChatGPT Plus — $20/month (includes Custom GPT builder)

The Concept

A Custom GPT is like hiring a new team member who has read every word of your plan documents and can answer questions about them instantly — but only within the boundaries you set. You tell it: here are the documents, here are the rules for how to answer (cite your sources, don't speculate, flag when something needs carrier verification), and here's who you're helping. Then you can share the link with your HR team or, if your organization allows it, with employees directly. The GPT doesn't replace your judgment — it handles the lookup so you can focus on the interpretation.

Build It Step by Step

Part 1: Access the Custom GPT Builder

  1. Log in to chat.openai.com with your Plus account
  2. Click Explore GPTs in the left sidebar
  3. Click Create in the top right of the GPT store page
  4. You'll see the GPT Builder interface — a split screen with a configuration panel on the left and a preview chat on the right

What you should see: A form asking for your GPT's name, description, and instructions, with a file upload section in the Knowledge area.

Part 2: Configure the Basic Settings

Name: "Benefits Q&A — [Company Name] 2026"

Description: "Answers questions about [Company Name]'s 2026 employee benefits based on our official plan documents. For HR team use."

Profile picture: Upload your company logo or leave the default.

Instructions (this is the most important part — paste this, then customize):

Copy and paste this
You are a benefits Q&A assistant for [Company Name]'s HR team. You have access to [Company Name]'s 2026 employee benefit plan documents including the SPD, SBCs for each health plan, and dental and vision summaries.

YOUR ROLE:
You help HR staff and benefits administrators quickly find accurate information about our employee benefit plans. You draft answers they can send to employees, look up coverage details, and explain how benefits work.

RULES FOR ANSWERING:
1. Always base your answers on the uploaded plan documents — never speculate or use general knowledge about what "most plans" cover
2. Cite the specific document and section where the information comes from (e.g., "Per the 2026 Cigna PPO SPD, Section 4.2...")
3. If you can't find the information in the uploaded documents, say: "I don't see this addressed in the uploaded plan documents. Please verify with [TPA/carrier name] directly."
4. Flag when questions require medical judgment: "This is a medical necessity question that should be reviewed by the treating physician and the carrier."
5. For questions about specific employee records (eligibility status, past claims), say: "This requires checking the carrier system directly — I only have access to plan documents, not individual employee records."

TONE:
- Professional and clear
- Brief — lead with the answer, then the source
- Empathetic when the question involves denied claims or difficult situations

WHAT YOU'RE NOT:
- You are not providing legal advice
- You are not making coverage determinations
- You are not accessing individual employee data

PLANS COVERED:
[List your plans here: "Cigna PPO, Cigna HDHP with HSA, Delta Dental PPO, VSP Vision"]

Part 3: Upload Your Plan Documents

  1. In the left panel, scroll to the Knowledge section
  2. Click Upload files
  3. Upload your documents one at a time:
    • SPD (Summary Plan Description) — most important
    • SBC for each health plan (Cigna PPO SBC, Cigna HDHP SBC, etc.)
    • Dental plan document or summary
    • Vision plan document or summary
    • Any additional plan documents (FSA, HSA, life insurance)
  4. Wait for each file to show a checkmark confirming it processed

What you should see: Each file listed under Knowledge with a checkmark. Files with errors need to be re-uploaded in a different format (try PDF → convert to text if PDF upload fails).

Troubleshooting: If a document fails to upload, try:

  • Saving it as a different PDF version
  • Breaking large documents into smaller chapters
  • Copying the text into a Word document and uploading that instead

Part 4: Set Up Conversation Starters

In the Conversation Starters section, add 4 example questions your team commonly asks. These appear as clickable suggestions when someone opens the GPT:

  1. "What is the deductible and out-of-pocket maximum for the Cigna PPO, family tier?"
  2. "Is prior authorization required for physical therapy?"
  3. "An employee is getting married next month. What changes can they make and what documentation do they need?"
  4. "What's covered under our dental plan for orthodontia?"

Part 5: Test the GPT in the Preview Panel

Before publishing, test with 10 questions you already know the answers to. Check:

  • Are dollar amounts correct and matching your plan documents?
  • Does it cite the source document and section?
  • Does it appropriately flag when it can't find information?
  • Does it refuse to speculate about individual employee situations?

If an answer is wrong, check that the relevant document uploaded correctly. You can also refine the Instructions to be more specific: "When asked about deductibles, always specify whether you're citing the individual or family amount."

Part 6: Publish and Share

  1. Click Save or Publish in the top right
  2. Choose the sharing option:
    • Only me: Private — just for your own use
    • Anyone with the link: Share with your HR team by sending the GPT link
    • Public: Anyone can find and use it (only appropriate if you want employee-facing access)
  3. Copy the sharing link and send to your HR team members

For employee-facing deployment: This requires more careful review. Make sure the instructions prohibit the GPT from making coverage determinations, and add a disclaimer: "This tool provides general plan information only. For coverage determinations, contact [carrier phone number]."

Real Example: Full Q&A Workflow

Setup: Your Custom GPT "Benefits Q&A — Acme Corp 2026" has your Cigna PPO SPD, two SBCs, Delta Dental plan document, and VSP vision summary uploaded.

Your HR colleague opens the GPT and asks: "An employee wants to know if their sleep study and CPAP equipment are covered under the PPO plan and if they need prior authorization."

What the GPT responds: "Per the 2026 Cigna PPO SPD, Section 5.3 (Durable Medical Equipment) and Section 4.1 (Outpatient Services):

Sleep Study: Covered as an outpatient diagnostic service when ordered by a physician. No prior authorization required for in-network providers, but prior authorization IS required for out-of-network sleep studies.

CPAP Equipment: Covered under Durable Medical Equipment (DME) at 80% after deductible for in-network. Prior authorization IS required. The employee's physician must submit documentation of medical necessity to Cigna at 1-800-XXX-XXXX before the equipment is ordered.

Source: Cigna PPO SPD 2026, Section 5.3 (DME) and Prior Authorization list (Section 2.7)"

Time saved: What would take 8-10 minutes of PDF searching takes 5 seconds.

What to Do When It Breaks

  • "The GPT is giving wrong dollar amounts" → Check that your latest SBC is uploaded (not last year's). Delete the old document from Knowledge and re-upload the current version.
  • "It won't answer certain questions" → Your Instructions may be too restrictive. Review the Instructions section and soften any overly broad restrictions.
  • "It's speculating about coverage rather than citing documents" → Add to your Instructions: "If the answer is not explicitly stated in the uploaded documents, always respond: 'I don't see this addressed in the plan documents. Please verify with [carrier] directly.'"
  • "Employees are using it to make coverage decisions" → Add a disclaimer banner to the GPT description and refine Instructions to always recommend calling the carrier for coverage determinations.

Variations

  • Simpler version: Use Claude Projects instead (see Level 3 guide) — same concept without the Custom GPT builder UI; easier to set up, not shareable via link
  • Extended version: Add a second GPT for COBRA administration that knows your COBRA deadlines, premium rates, and election procedures — useful for HR staff handling terminations

What to Do Next

  • This week: Build the GPT, test it with 20 real questions, and share with one HR colleague for feedback
  • This month: Track how often the GPT is used and what questions it handles vs. escalates — this tells you what to add to Knowledge
  • Advanced: Add a "frequently missed questions" document to Knowledge — a text file of edge cases and tricky plan provisions you've encountered, written as Q&A pairs

Advanced guide for Benefits Administrator professionals. Custom GPTs require ChatGPT Plus ($20/month). Keep plan documents current — update Knowledge every plan year after open enrollment.