How to Write Letters and Emails with ChatGPT: Sympathy Notes, Complaints, and the Appeal That Wins

The short version: any letter you’ve been putting off — the complaint, the thank-you, the condolence card you don’t know how to start, the insurance appeal that feels like homework — takes about ten minutes with ChatGPT and three blanks: who it’s for, what happened, how you want to sound. This guide gives you the prompts for each one, one privacy rule that protects you, and a Medicare appeal section with numbers no other letter-writing page will show you. Everything verified in August 2026.

Why trust this: I’m a professor of AI and robotics and a former Samsung researcher, with no affiliate ties to anything here. My rule for AI writing is the same one I teach: the machine finds the words, but the judgment — and sometimes the handwriting — stays yours.

First, the one privacy rule

Letters are full of personal details — that’s what makes them letters. So before any prompt, one rule, and it isn’t optional:

Never paste your Social Security number, Medicare number, bank or account numbers, or any password into ChatGPT. OpenAI’s own help pages say it plainly: don’t share sensitive information in your conversations. And on free accounts, chats can be used to train the model unless you turn that off.

The working method is simple — draft with brackets:

• In the chat, write [MY MEDICARE NUMBER], [ACCOUNT NUMBER], [MY ADDRESS] wherever a real number would go.
• Copy the finished letter out to paper or your email — then fill in the real numbers there. The numbers live on the letter, never in the chat.
• Two settings worth one minute: Settings → Data Controls → turn off “Improve the model for everyone” stops your chats being used for training. And a Temporary Chat (the option is in the model menu at the top) isn’t used for training and is deleted within 30 days — a good habit for anything personal.

The whole trick: fill three blanks

Every letter on this page is the same prompt wearing different clothes:

Write a [letter / email] to [WHO — my electric company / my landlord / my friend Ruth].
Here's what happened: [THE FACTS — dates, amounts, names, in any order; messy is fine].
I want to sound [TONE — firm but polite / warm / brief and businesslike].
Keep it under [LENGTH — 150 words]. Ask for exactly one thing: [WHAT I WANT].

Messy input is genuinely fine — that’s the point. Type the facts the way you’d tell a neighbor, and let the machine do the organizing. Then read the draft and change two sentences so it sounds like you (more on that at the end).

Letter 1 — the complaint that gets results

Write a complaint letter to [COMPANY]. The facts: I was billed [$X] on [DATE] for [WHAT]. I called on [DATE] and was told [WHAT THEY SAID]. Nothing has changed. I want to sound firm, calm, and impossible to ignore — no threats, no sarcasm. End by asking for exactly one thing: [REFUND / REPAIR / CORRECTED BILL] by [DATE]. Under 200 words, with a subject line.

Why this works: complaints fail when they’re long, angry, or ask for nothing specific. Dates, amounts, one request, one deadline — that’s a letter a company can act on. If the first draft is too soft, the follow-up is one line: “Make it firmer, still polite.”

What a good result looks like — a typical draft (yours will carry your facts):

How to judge any complaint draft in ten seconds — three questions:

• One ask? If the letter requests two things, the company picks the cheaper one.
• A date? “Soon” is not a deadline. April 15 is.
• Nothing to argue with? Every sentence should be a checkable fact or a clear request — cut anything that merely vents.

Letter 2 — the condolence note, and why you’ll copy it by hand

This is the letter people put off longest, and the etiquette people say the biggest mistake isn’t writing the wrong thing — it’s not sending anything at all. Daniel Post Senning of the Emily Post family, asked about condolences, is blunt: a written note matters, and “snail mail is better than email” — a card says I took the time to do this for you.

So here is the honest division of labor: let the AI help you find the words. Then copy them onto the card in your own handwriting, and mail it. Nobody needs to know how the words arrived. The hand is what they’ll keep.

Help me write a short condolence note to [NAME], whose [husband / mother / son] [NAME] died. One specific memory I have: [MEMORY — even something small, like his laugh at church suppers]. I want it warm, simple, and honest — 50 to 80 words. No clichés: do not use "in a better place," "everything happens for a reason," "at least," or "I know how you feel." End with one concrete offer of help I can actually keep: [BRINGING DINNER THURSDAY / DRIVING TO THE SERVICE].

Three lines worth keeping in your head even without the AI:

• Name the person who died. Grieving people ache to hear the name spoken.
• One true memory beats three beautiful sentences. “I’ll always see him waving from the porch” outlives any poetry.
• Offer one specific thing — dinner on a day, a ride, the lawn — not “let me know if you need anything,” which politely asks the griever to do the work.

The shape on the page — about sixty words, and that is plenty:

That’s the shape, not a script — swap in your memory and your Thursday, and it stops being anyone else’s letter. Then the part the AI can’t do: your handwriting, an envelope, a stamp.

Letter 3 — the Medicare appeal, with the numbers nobody shows you

Here is the statistic this whole article exists for. KFF analyzed Medicare Advantage denials for 2024 and found that only 11.5% of denied prior-authorization requests were ever appealed. Of the appeals that were filed, 80.7% were partly or fully overturned. That has held for six straight years — more than eight in ten appeals win something.

Appealing is the least-used button in American healthcare, and it works four times out of five. The reason people don’t press it is that it feels like a legal document. It isn’t. Medicare’s own site says a written request — a plain letter — counts, as long as it contains:

• Your name and address,
• Your Medicare number (written on the mailed letter — per the rule above, not pasted into the chat),
• The exact items or services you’re appealing and their dates,
• Why they should be covered — your doctor’s words are the strongest material here,
• Anything supporting it: a doctor’s note, test results.

The prompt:

Write a Medicare appeal letter. The facts: Medicare denied [SERVICE / ITEM] on [DATE OF DENIAL NOTICE]. My doctor, Dr. [NAME], says it is medically necessary because [DOCTOR'S REASON — quote the visit summary if you have it]. My relevant history: [BRIEF — e.g., two falls this year]. Tone: plain, firm, respectful — no legal jargon. Structure: what was denied, why it is medically necessary, what I am asking for (coverage), and a list of what I am enclosing. Use [MY NAME], [MY ADDRESS], and [MEDICARE NUMBER] as placeholders. Under 300 words.

And here is what the finished letter looks like on the page — the highlighted spots are where your real details go, on paper, never in the chat:

The clock, honestly stated:

• Original Medicare: your exact deadline is printed on your Medicare Summary Notice; the standard window is 120 days from the initial determination (the official form itself asks you to explain only if you’re past 120). One dated correction to older guides: paper MSNs now arrive every six months, not quarterly — so don’t wait for the mail to tell you; you can see claims anytime at Medicare.gov.
• Medicare Advantage: shorter — 65 days from the date on the denial notice, and the plan must answer on a clock (72 hours if your health can’t wait).
• There are five appeal levels in all, but most cases end at the first or second. Level one is called a “Redetermination” — if you’d rather use the official form than a letter, it’s CMS-20027.

And the same skeleton — facts, doctor’s reasoning, one request, enclosures — works for any insurance denial letter: dental, homeowner’s, an explanation-of-benefits surprise. The deadline changes; the letter doesn’t.

Four more you’ll use this year

Write a short letter to my landlord requesting a repair: [WHAT'S BROKEN] since [DATE], reported on [DATE]. Polite, firm, asks for a repair date in writing. Under 120 words.

Write a brief message to my doctor's office asking for [AN APPOINTMENT / A MEDICATION REFILL / MY TEST RESULTS]. Include: name [MY NAME], date of birth [DOB], and the best way to reach me [PHONE]. Three sentences.

Typical result: “Hello, this is [MY NAME], date of birth [DOB]. I’m due for a refill of my blood-pressure medication and my pharmacy shows no refills left. Could you send a new prescription to my pharmacy, or let me know if I need a visit first? Best number for me: [PHONE].” — polite, complete, and the office can act on it without calling you back twice.

Write a warm thank-you note to [NAME] for [WHAT THEY DID]. One specific detail: [DETAIL]. 60 words, sounds like a real person, not a greeting card.

Rewrite this reply so it is polite but says no clearly, without apologizing three times: [PASTE YOUR DRAFT].

The two-minute edit that makes it yours

• Read it out loud once. Anywhere you stumble, the machine wrote it — change those words to yours.
• Swap in one phrase only you would say. If your letters always end “take care now,” end this one that way.
• Add one detail the AI couldn’t know. The date of the church supper. The name of the dog. That detail is the signature no font can fake.

The test: if every sentence could have been written by anyone, it isn’t finished. Two changed sentences is usually enough.

Watch someone do it

A patient, senior-paced ChatGPT walkthrough from a channel built for exactly this audience (346,000 views):

And a brisk, current one specifically on writing email with ChatGPT, from March 2026:

FAQ

Can ChatGPT write a letter for me for free?

Yes — a free account drafts letters and emails with no meaningful limit for text. Give it the three blanks (who, what happened, tone), then change two sentences so it sounds like you.

Is it safe to put personal information into ChatGPT?

Follow the bracket rule: never paste your SSN, Medicare number, account numbers, or passwords — OpenAI’s own pages say not to share sensitive information, and free-account chats can train the model unless you turn it off (Settings → Data Controls → “Improve the model for everyone”). Draft with [BRACKETS]; fill in real numbers only on the letter itself.

What should I write in a condolence card?

Short and true: say you’re sorry, name the person who died, share one specific memory, offer one concrete help. Avoid “at least,” “in a better place,” and “I know how you feel.” Draft with AI if the words won’t come — then copy it by hand and mail it. The handwriting is the part they keep.

Can I appeal a Medicare denial with just a letter?

Yes. Medicare accepts a written request as long as it has your name, address, Medicare number, the exact services and dates, and why they should be covered — attach your doctor’s note. The official form (CMS-20027) exists if you prefer it, but a plain letter counts.

How long do I have to appeal?

Original Medicare: the deadline is printed on your Medicare Summary Notice — the standard window is 120 days. Medicare Advantage: 65 days from the date on the denial notice, with fast tracks (72 hours) when health can’t wait. The letter takes ten minutes; don’t give the deadline a chance.

Do Medicare appeals actually work?

Four times out of five. KFF’s analysis of 2024 data: only 11.5% of denied prior-authorization requests were appealed, but 80.7% of appeals were partly or fully overturned — a rate that has held above eight in ten for six years running.

How do I end a letter?

Official: Sincerely or Respectfully. Friendly-but-businesslike: Best regards. Personal: Warmly, With love, Thinking of you. When unsure, Sincerely is never wrong — and ChatGPT will match the closing to the tone if you ask.

The bottom line

The letters that matter most are the ones that never get sent — the condolence you couldn’t start, the appeal that looked like homework. Three blanks, one privacy rule, ten minutes. Let the machine find the words, keep the numbers on the paper, sign it with a detail only you know — and send it. Especially the appeal. Four out of five.

I explain AI in plain English — one short, friendly email a month. Unsubscribe anytime.

Keep reading

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• ChatGPT for Excel — formulas from plain English — no memorizing, ever.
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• Prep for a Doctor Visit with ChatGPT — one printed page: timeline, meds, top three questions.

About the author

Prof. H is a professor of AI and robotics, a former Samsung researcher, and the author of dozens of textbooks on AI and automation. He writes hands-on, no-hype guides to AI tools. More about the author →