Upcoding occurs when hospitals submit billing codes to insurers for more serious diagnoses or procedures than were actually provided, resulting in higher reimbursement than the care delivered warrants. This practice is fraud, and the U.S. Department of Justice enforces it aggressively—recovering a record $6.8 billion in healthcare fraud settlements in fiscal year 2025.
The impact reaches directly into your bills. When a hospital upcodes, your insurer—or you, if you're uninsured—may be charged for a more expensive diagnosis or procedure than what actually occurred. Understanding what this fraud is, how to spot it, and what enforcement looks like can help you verify accuracy in your own medical bills and know when a charge warrants questioning.
Table of Contents
- How Hospitals Upcode
- How Widespread Is Upcoding?
- Legal Consequences for Hospitals
- How to Spot Upcoding on Your Own Bills
- What to Do If You Suspect Fraud
- Frequently Asked Questions
How Hospitals Upcode
According to the HHS Office of Inspector General, upcoding means submitting billing codes to Medicare, Medicaid, or private insurers that represent more serious diagnoses or procedures than were actually provided. The most common method targets the principal diagnosis code—the code that determines which payment level a hospital receives. A single incorrect principal diagnosis code directly shifts the entire reimbursement without obvious red flags, making it a frequent target in audits.
A concrete example: a patient is admitted with lower-back pain and receives physical therapy. A hospital might code the admission as a more complex spinal condition requiring surgical intervention, even though no surgery occurred. The payment difference between these codes can be thousands of dollars per admission.
How Widespread Is Upcoding?
The practice has grown significantly. From 2014 to 2019, the number of Medicare inpatient stays billed at the highest severity level increased nearly 20%, with approximately 40% of all 8.7 million Medicare inpatient cases in 2019 billed at the highest severity level. This scale prompted the federal government to make healthcare fraud enforcement a priority.
The Department of Justice recovered a record $6.8 billion in healthcare fraud settlements in fiscal year 2025—a 120% increase from 2024—with approximately 84% ($5.7 billion) related to healthcare fraud including upcoding. Recent cases reveal the breadth: UCHealth hospitals settled for $23 million in 2024–2025 over upcoding allegations in emergency department visits alone, flagging ED coding as particularly vulnerable. Meanwhile, a sample HHS OIG audit of UnitedHealthcare of Wisconsin found $722,000 in improper overpayments from upcoded high-risk diagnoses, with extrapolation to an estimated $46.9 million in improper reimbursement for 2020–2021.
Legal Consequences for Hospitals
When caught, hospitals face substantial penalties. Under the False Claims Act, civil penalties can exceed $25,000 per false claim submitted, with criminal prosecution carrying up to 10 years imprisonment, potential Medicare/Medicaid exclusion, and revocation of medical licenses for involved physicians or administrators. Landmark cases illustrate the severity. In 2006, Tenet Healthcare settled a $900 million False Claims Act case—the largest at that time—with $46 million specifically for assigning unsupported or improper diagnosis codes to inflate reimbursement. Two decades later, enforcement has only intensified, and the penalties have grown alongside it.
How to Spot Upcoding on Your Own Bills
You cannot diagnose upcoding with certainty without medical expertise, but you can look for red flags: If you spot a discrepancy, request an itemized bill and ask your hospital's billing department to explain the coding. If they cannot justify it against your medical record, you can file a complaint with your state's insurance commissioner or the HHS OIG.
- The documented diagnosis in your bill doesn't match what your doctor's notes say you were treated for
- You receive a bill code labeled as requiring surgery or intensive intervention when your visit was routine
- The severity level seems disproportionate to the treatment you actually received (e.g., an office visit coded at a hospital inpatient level)
- A bill references procedures or diagnoses not mentioned in your discharge summary
What to Do If You Suspect Fraud
If you believe a hospital has overcharged you due to upcoding, you have options: If your insurer has already paid the inflated amount, you may have limited direct recovery, but your report helps law enforcement build cases against repeat offenders and may protect future patients.
- **Report to your state insurance commissioner:** Every state has an insurance department that investigates billing complaints.
- **File a complaint with the HHS OIG:** The Office of Inspector General maintains a complaint hotline for suspected healthcare fraud.
- **Contact a healthcare attorney:** Upcoding cases can be complex, and an attorney experienced in medical billing disputes can evaluate whether you have grounds for action or recovery.
- **Document everything:** Keep all bills, medical records, and correspondence related to the disputed charges.
Frequently Asked Questions
What's the difference between upcoding and overbilling?
Overbilling can mean charging twice for one service or billing for services not rendered. Upcoding means assigning billing codes for more serious diagnoses or procedures than actually provided, to trigger higher reimbursement. Both are fraud, but they work differently.
Can I get a refund if my hospital upcoded my bill?
If you've already paid, direct refunds depend on whether your insurer has already recouped money from the hospital. You can file a complaint with your state insurance commissioner or the HHS OIG, but recovery for individual patients is not guaranteed. However, your report helps prosecutors build enforcement cases.
Is every unexpected high code automatically upcoding?
No. Hospitals assign codes based on the diagnoses documented in your medical record. A higher-severity code might be correct if your condition was more serious than you realized or if complications developed during your stay. The key is whether the code matches what your medical record documents.