Custom GPT: Your PA Letter and Patient Counseling Assistant

What This Builds

You'll build a Custom GPT — a personalized AI assistant living inside ChatGPT — that is specifically configured to handle your two highest-value repetitive writing tasks: prior authorization appeal letters and patient counseling materials. Once built, anyone in your pharmacy can use it simply by clicking a link — no prompt crafting required. Just describe the situation, and the GPT knows exactly what format, content, and clinical rigor to apply.

It's like having a clinical writing specialist on call who knows your pharmacy's style guide, your common PA scenarios, and your patient population — available in 10 seconds, around the clock.

Prerequisites

• ChatGPT Plus subscription — {{tool:ChatGPT.price}}/month at {{tool:ChatGPT.url}}
• 3–5 example PA appeal letters you've written (remove patient info)
• Clarity on your top 5 most common PA denial scenarios
• 30 minutes of uninterrupted time to build and test

The Concept

A Custom GPT is a saved version of ChatGPT with custom instructions, a knowledge base, and a specific personality built in. When your technicians or colleagues open your Custom GPT, it already knows it's a pharmacy PA and counseling tool — they just describe the situation and get immediately useful output.

Think of it like a form in your pharmacy management system, except instead of filling in fields, you describe the clinical situation in plain language and get a complete professional document back.

Build It Step by Step

Part 1: Access the Custom GPT Builder

1. Log into ChatGPT at {{tool:ChatGPT.url}} with your Plus account
2. Click your profile icon in the upper right → My GPTs
3. Click Create a GPT (green button)
4. You'll see two tabs: Create (conversation-based builder) and Configure (manual settings)
5. Click Configure — this gives you direct control over all settings

What you should see: A configuration form with fields for Name, Description, Instructions, Conversation starters, and Knowledge upload.

Part 2: Name and Describe Your GPT

• Name: Pharmacy PA & Counseling Assistant — [Your Name]
• Description: Generates prior authorization appeal letters and patient education materials for community pharmacy practice. Knows pharmacy clinical guidelines and uses professional letter format.

Part 3: Write the Custom Instructions

In the Instructions field, paste this template (customize the bracketed sections):

You are a specialized pharmacy assistant for a [retail / independent / hospital] pharmacist. You have two core functions:

FUNCTION 1: PRIOR AUTHORIZATION APPEALS
When asked to write a PA appeal letter:
- Request: drug name, patient diagnosis, denial reason, prior treatments tried, relevant clinical data (A1C, EF, etc.)
- Research and cite the relevant clinical guidelines (ADA, ACC/AHA, ASHP, IDSA, ACR — whichever applies)
- Write a complete appeal letter with: professional header, clear medical necessity statement, patient-specific clinical justification, guideline citations with specific recommendation text, documentation of step therapy failure or contraindication, and a specific request
- Keep letters under 400 words unless clinical complexity requires more
- Use formal clinical language appropriate for payer review
- Always include placeholders for: [PRESCRIBER NAME, DEA#, NPI], [PHARMACY NAME, ADDRESS, PHONE], [PATIENT ID/DOB], [DATE]

FUNCTION 2: PATIENT EDUCATION MATERIALS
When asked to write a patient handout or counseling script:
- Use 6th-grade reading level
- Use numbered lists and short sentences, not paragraphs
- Include these sections: What This Medicine Is For | How to Take It | Side Effects to Watch For | When to Call the Pharmacy
- Keep to one page (approximately 300 words)
- If asked for a translation, provide the same content in the requested language
- For counseling scripts, write in conversational language the pharmacist would actually say

CLINICAL STANDARDS:
- Cite real clinical guidelines; note if you're uncertain about a specific citation
- For high-alert medications (warfarin, insulin, opioids, digoxin, lithium), always emphasize the specific monitoring and warning signs
- Never give specific dosing recommendations — always say "as prescribed" or recommend confirming with prescribing information
- If asked about drugs approved in 2024 or later, note that information may be limited and recommend verifying with current FDA labeling

Part 4: Add Conversation Starters

In the Conversation starters field, add these ready-to-click prompts that your colleagues can use:

1. "Write a PA appeal letter for [drug name]"
2. "Create a patient handout for [drug name]"
3. "Help me respond to a PA denial for step therapy"
4. "Write instructions in Spanish for [drug name]"

Part 5: Upload Knowledge Documents

Click the + button in the Knowledge section and upload:

• Your 3–5 best PA appeal letters (as a single Word document, patient info removed)
• A one-page summary of your pharmacy's most common PA denial scenarios and preferred arguments

What you should see: Uploaded documents appear as files in the Knowledge section.

Part 6: Save and Share

1. Click Save in the upper right
2. Choose visibility: Only me (private) or Anyone with a link (shareable with your team)
3. Click View GPT to open your finished Custom GPT

To share with colleagues: Copy the GPT link from the address bar and share it via text or email. Anyone with ChatGPT Plus (or free, for basic usage) can access it.

Real Example: Complete Workflow

Setup: Your Custom GPT is live and has your PA letter templates uploaded as knowledge

Your technician types: "PA appeal for Ozempic. Patient has type 2 diabetes, A1C 9.1%. Insurer denied it and requires metformin first. Patient tried metformin 1000mg twice daily for 14 months — stopped due to GI intolerance at maximum tolerated dose."

Your Custom GPT generates:

• A complete 380-word appeal letter
• Opening paragraph: medical necessity statement with A1C value cited
• Middle: metformin trial documentation (duration, dose, discontinuation reason)
• ADA 2025 Standards of Care citation for GLP-1 agonist use when metformin is not tolerated
• Closing: specific request for approval with clinical urgency framing
• Placeholders for prescriber and patient identifiers

Time: 90 seconds from typing to complete draft

Your time: 5 minutes to review, add specific details, and format for submission

What to Do When It Breaks

• GPT doesn't use clinical guideline language → Add to instructions: "Always cite at least one specific clinical guideline with the relevant recommendation text"
• Letter structure varies too much → Add a specific letter format template in your instructions: "Use this exact letter structure: [paste your template]"
• Patient handouts are too clinical → Add to instructions: "For patient handouts, run a mental readability check — every sentence should be understandable by someone who did not finish high school"
• Colleagues can't access it → Ensure sharing is set to "Anyone with a link" and they have a ChatGPT account

Variations

• Simpler version: Just write detailed instructions without uploading knowledge files — still 80% as good, but faster to build
• Extended version: Build separate Custom GPTs for PA appeals (detailed, formal) and patient counseling (plain language, printable) — each optimized for its specific output type

What to Do Next

• This week: Build the GPT, share the link with one trusted colleague, and get feedback on letter quality
• This month: Refine the instructions based on real usage; add more knowledge documents as you produce new templates
• Advanced: Combine this with a Claude Project (Level 4) for a complete two-tool pharmacy AI system — Claude Project for complex clinical reasoning, Custom GPT for standardized document generation

Advanced guide for staff pharmacist professionals. Custom GPTs require ChatGPT Plus. Do not upload PHI or patient-identifiable information. Verify all clinical content before patient or payer submission.