Is a Fake Doctor's Note Illegal? How Employers Catch Fakes, Including AI-Made Notes

Adam Z. Kawalek, MD

Published October 2, 2026 · 10 min read

A fake doctor's note takes a few minutes to make. Free templates, editable PDFs and AI chatbots will all produce something that looks official. The trouble starts when someone at work picks up the phone, looks up the doctor, or scans the code on the page. Here is what the law says, how fakes get caught, and what a real note carries that a fake one can't.

The short answer: yes, a fake doctor's note can be a crime. State forgery laws cover making a false document, changing a real one, and handing either one to someone you mean to deceive. People have been criminally charged over a single forged sick note. Employers are also allowed to check notes, and checking one takes minutes.

Is a fake doctor's note illegal?

Forgery is the legal name for it. The wording differs from state to state, but the idea is the same everywhere. It is a crime to make or change a document so it appears to come from someone who never wrote it, when you plan to use it to deceive another person. Using the fake counts, not just making it. New York and Texas show how the laws read.

Other states have their own versions, and prosecutors do bring these cases. Three that made the news:

• Indiana, 2019. A Postal Service plant manager asked the agency's inspector general to confirm a note that excused an employee from work for a week. The clinic named on it said nobody there had issued it. The employee admitted making it on her computer and was charged with counterfeiting (ABC57).
• Illinois, 2021. A state transportation supervisor accused of writing fake doctor's notes to excuse himself from work was indicted in DuPage County on five counts of forgery and five counts of wire fraud (Fox 32 Chicago).
• New York, 2026. In Saranac Lake, a coworker noticed inconsistencies in an employee's medical notes. Investigators found the letterhead and signatures didn't match real documents from the local medical center, and he was charged with third-degree forgery and second-degree criminal impersonation (CNY Central).

Separate from any criminal case, a forged note puts the job itself at risk, because it is falsified paperwork handed to an employer.

How fake doctor's notes get caught

Employers are allowed to check. HHS, which enforces the federal health privacy rule, says your employer can ask you for a doctor's note when it needs the information for sick leave. The EEOC says an employer may ask for a doctor's note to justify sick leave as long as it asks the same of every employee. For FMLA paperwork, the Labor Department lets HR, a leave administrator or a manager (never your direct supervisor) contact the health care provider to authenticate it.

Most checks take a few minutes. These are the things that give a fake away:

• The office on the letterhead never saw you. Urgent care, ER or family practice, it doesn't matter. One call to the office named on the note is often all it takes. That is how the Indiana case unraveled.
• The doctor's name and NPI don't match. Practicing physicians have a National Provider Identifier, a 10-digit number anyone can look up in the federal NPI Registry. A made-up doctor, a missing NPI, or an NPI that belongs to someone else stands out fast.
• The letterhead or signature looks off. Logos, fonts, addresses and signatures that don't match the clinic's real paperwork are what gave away the New York case.
• The dates don't add up. A note signed before the illness started, dates in a slightly different font, or a visit on a day the clinic was closed.
• There is nothing to verify. Notes from verifiable services carry a document ID or a QR code that leads to a record. A note with no way to check it gets a harder look, not a pass.

If you work in HR, our step-by-step guide to verifying a doctor's note walks through each check in order, without asking the employee anything medical.

Can ChatGPT or an AI tool make a doctor's note?

An AI chatbot can write something that reads like a doctor's note in seconds. Looking real was never the hard part. Researchers showed in 2024 that ChatGPT can generate fake medical reports, in a paper in the journal Diagnosis titled "For any disease a human can imagine, ChatGPT can generate a fake report."

What no AI tool can produce is the part an employer checks: a licensed physician who actually evaluated you, an NPI that belongs to the person who signed, and an office that confirms the note when asked. So an AI-made note fails the same phone call a printed template fails. Legally it is treated the same way too, because forgery laws look at who a document claims to come from, not at the software that made it.

The AI companies don't allow it either. OpenAI's usage policies bar using its services to manipulate or deceive people, including any use for deceit, fraud or impersonation.

The same goes for fake doctor's note generators and editable templates. Downloading a blank template is not the crime. Filling one in and handing it to an employer or a school as a real note is what forgery laws describe.

Can you edit a doctor's note?

No. Changing a date or a name on a real note is forgery too, because the laws cover altering a document, not just inventing one. New York's law says "falsely makes, completes or alters." Texas covers making a writing look like it was signed "at a time or place ... other than was in fact the case." A real note with an edited date is a forged note.

Edits also tend to show. On SickSlip notes issued since October 2026, the note's dates and Document ID are printed faintly across the entire page, so changing a date in the letter leaves the original sitting underneath. The verification record also keeps the dates we issued.

If a date on your note is wrong, don't touch the file. Email support@sickslip.co instead. When we correct a note, the change is made on our record, and the verification page shows that the note was amended. If your note was written after the days you missed, that is common, and here is how notes dated after an absence work.

How hard is it to get a fake doctor's note?

Making one is easy. Getting away with one is not, because a fake only has to fail one check, and notes stay in personnel files. A check can come months later, during a review, an FMLA request or an investigation. The Illinois case began with a tip to state police investigators.

Compare that with the real thing. A verifiable note from SickSlip costs $29.99, and if a physician can't issue one, you get a full refund. Here is what a doctor's note costs everywhere else.

What a real SickSlip note carries that a fake can't

Every SickSlip note is built to be checked. This is what is on the page and how anyone can confirm it.

The verification page confirms the document is authentic and shows its Document ID, issue date, absence dates, the physician's name and NPI, and the state license. It never shows a diagnosis or the patient's name. If a note has been revoked, the page says so. If a note was corrected after it was issued, the page says that too.

That is the point of a real note. It is designed to pass the exact checks that sink a fake one. For a closer look at the format, see what a real doctor's note looks like.

What to do instead

If you are sick and work wants proof, get a real note. With SickSlip you answer a short medical questionnaire online, and a board-certified physician licensed in your state reviews it. When a note is clinically appropriate, it is signed the same day. It costs $29.99 flat, and if a note can't be issued, you get a full refund. You can get a real doctor's note for work online in about two minutes of typing.

If you are not sick, a doctor's note is the wrong tool, and no legitimate physician will write one. Ask for a personal day or PTO instead. If you are sick and worried about your job, check your state's sick leave rules. Many states protect paid sick time by law.

This article is general information, not legal advice. Laws vary by state and individual circumstances differ. For advice about a specific situation, talk to an attorney licensed in your state.

Adam Z. Kawalek, MD

Board-Certified Physician · Founder, SickSlip · Cedars-Sinai · Johns Hopkins

Dr. Kawalek is a hospitalist physician with 15+ years of clinical experience. He founded SickSlip to give patients fast, affordable access to legitimate medical documentation without unnecessary clinical barriers.