In Michigan, a doctor generally has one year from the date of service to submit a bill to your health insurer, and up to six years to sue you personally for an unpaid balance. That answers the core question of how long after service a doctor can bill you in Michigan, but the full picture depends on who is paying: private insurance, Medicaid, Medicare, or auto no-fault coverage each carry their own deadlines, and a few state and federal rules limit what you can be charged when a bill finally shows up.
The One-Year Deadline to Bill Your Insurer
Under Michigan’s Insurance Code, a healthcare provider has one year from the date of service (or the date of hospital discharge) to submit a “clean claim” to a health plan.1Department of Insurance and Financial Services. Clean Claims and Other Information for Health Providers A claim submitted after that window loses clean-claim status, and the insurer has no obligation to pay it.
Once a clean claim is submitted, the insurer must pay it within 45 days. If it doesn’t, the unpaid amount begins accruing simple interest at 12% per year, and the Director of the Department of Insurance and Financial Services (DIFS) can impose civil fines of up to $1,000 per violation, capped at $10,000.1Department of Insurance and Financial Services. Clean Claims and Other Information for Health Providers Those rules are aimed at insurer delay, but they matter to you too: providers who can’t collect from a slow-paying insurer sometimes turn to patients for the balance, and Michigan’s timely-payment rule undercuts that pressure.
If you get a bill for insured services more than a year after treatment, push back. The provider may have missed the deadline to bill your insurer, and once that happens the insurer’s obligation is gone. That doesn’t automatically wipe out what you owe on a private plan, but it’s grounds to ask how the bill was handled and whether you’re being billed for something the provider forfeited the right to collect from your insurer.
Medicaid: A Stricter Rule That Protects Patients
Michigan’s Social Welfare Act imposes a parallel 12-month deadline for Medicaid claims, and it goes further than the private-insurance rule. If a provider misses the Medicaid billing window, neither the state nor the patient is liable for the bill.2Michigan Legislature. MCL 400.111b Providers can request a waiver in limited circumstances, but the default is strict. If you’re a Medicaid recipient and a provider tries to bill you for a service delivered more than a year earlier, they have almost certainly lost the right to collect that money from anyone.
How Long a Provider Can Sue You for an Unpaid Bill
Billing deadlines and lawsuit deadlines are separate. The one-year rule controls how quickly a provider must bill your insurer. A different rule, the statute of limitations, controls how long a provider or collection agency has to take you to court over money you personally owe.
Medical debt in Michigan is typically treated as a breach-of-contract claim, and the general statute of limitations for such a claim is six years.3Michigan Legislature. Michigan Compiled Laws 600.5807 – Damages for Breach of Contract That means a provider or collector generally has six years from the date you defaulted on the bill to file a lawsuit against you.
Two practical points. First, making a partial payment on an old medical debt can restart the six-year clock in some circumstances, giving the collector a fresh window to sue. If you’re weighing whether to send a token amount on a very old bill, understand that it can revive collection rights you’d otherwise have run out. Second, once the six years pass, a collector can still call and write about the debt, but they can’t win a lawsuit over it. If you get sued on an expired medical debt, you generally have to raise the statute of limitations as a defense yourself; the court won’t dismiss the case automatically.
Auto Accident Injuries Follow Different Rules
If your bill relates to injuries from a motor vehicle accident, the timeline runs through Michigan’s No-Fault Act rather than the general insurance code. To keep the right to personal protection insurance (PIP) benefits, the claimant must either give the insurer written notice of injury within one year of the accident or have already received at least one PIP payment during that first year.4Michigan Legislature. MCL 500.3145 Miss both, and the right to sue for benefits is gone.
When notice or payment has kept the claim alive, a lawsuit can be filed within one year after the most recent qualifying expense was incurred. There’s a lookback cap on recovery: you cannot recover benefits for any portion of a loss that was incurred more than one year before the suit was filed.4Michigan Legislature. MCL 500.3145 Waiting drops older bills out of what you can collect on, even if the case itself is timely.
Every Michigan auto insurer providing PIP coverage now runs a utilization review program to check whether post-accident treatment is medically necessary, with records kept for at least two years.5State of Michigan: Department of Insurance and Financial Services. Auto Insurance Reform FAQ In practice more claims are scrutinized and more denied than before the 2019 reform, so if your auto insurer refuses to pay a provider, the provider may look to you next.
Medicare’s 12-Month Rule
Medicare fee-for-service claims (Part A and Part B) must be submitted within 12 calendar months of the date of service.6Centers for Medicare & Medicaid Services (CMS). Pub 100-04 Medicare Claims Processing The deadline can be extended only in narrow situations:
- An HHS employee or contractor made a Medicare-related error.
- The patient’s Medicare coverage was established retroactively to a date on or before the service.
- A state Medicaid agency recouped money from the provider six or more months after the service.
- A Medicare Advantage plan recouped money from the provider after the beneficiary was retroactively disenrolled.
The most common exception is retroactive entitlement, usually tied to a disability determination that confirms eligibility after the fact.6Centers for Medicare & Medicaid Services (CMS). Pub 100-04 Medicare Claims Processing Absent one of these, a Medicare bill more than a year late is a bill Medicare will not pay.
Surprise Bills You Shouldn’t Have to Pay
A late bill and a surprise bill are different problems, but both hit patients who thought they were covered. Michigan has its own surprise billing law administered by DIFS, and the federal No Surprises Act adds another layer that applies regardless of state law.
Under the federal law, in effect since January 2022, you cannot be balance-billed for most emergency services from out-of-network providers, and you cannot be balance-billed for ancillary services (such as anesthesiology, pathology, and radiology) delivered by out-of-network professionals at an in-network facility. You owe only your in-network cost-sharing, and those amounts count toward your in-network deductible and out-of-pocket maximum.7U.S. Department of Labor. Avoid Surprise Healthcare Expenses: How the No Surprises Act Can Protect You
On the state side, when a nonparticipating provider disputes an insurer’s payment for emergency services with a complicating factor, the fight moves into binding arbitration through DIFS rather than onto the patient’s bill. The carrier has 30 days to reverse the denial or produce supporting documentation, and both sides pick an arbitrator from the DIFS approved list.8Department of Insurance and Financial Services. Surprise Medical Billing
Good Faith Estimates for Uninsured and Self-Pay Patients
If you’re uninsured or paying out of pocket, federal law requires providers to give you a written good faith estimate of expected charges before the service. The estimate is due within one business day after scheduling if the appointment is at least three business days out, or within three business days if scheduled 10 or more days ahead. You can also request an estimate on demand, and the provider must respond within three business days.9eCFR. 45 CFR 149.610 – Requirements for Provision of Good Faith Estimates of Expected Charges for Uninsured or Self-Pay Individuals
If the final bill exceeds the good faith estimate by $400 or more, you can dispute it through a federal patient-provider dispute resolution process. You have 120 calendar days from receiving the bill to start that dispute.10eCFR. 45 CFR 149.620 – Requirements for the Patient-Provider Dispute Resolution Process
What to Do When a Late or Wrong Bill Arrives
Ask for records first. Under HIPAA, billing records are part of your protected health information, and a provider must respond to your request within 30 calendar days, with one 30-day extension allowed if they notify you in writing during the first 30 days.11HHS.gov. Individuals’ Right Under HIPAA to Access Their Health Information In-person inspection is free. Copies may carry a reasonable fee for supplies, copying labor, and postage, but not for search or retrieval time. A provider cannot withhold your billing records because you have an unpaid balance.
Check the date of service against the deadline that fits your coverage: one year for private insurance and Medicaid, 12 months for Medicare, or the no-fault timelines for auto injuries. If the provider missed the window, say so in writing. For Medicaid patients, the statutory bar on collecting from you is your strongest argument.
Complaints go to DIFS, with one wrinkle. DIFS generally accepts complaints only from parties to the insurance contract, meaning you as the policyholder, not the provider. Providers have a narrower path for clean claim disputes using form FIS 0284, or they can file on your behalf with written authorization.1Department of Insurance and Financial Services. Clean Claims and Other Information for Health Providers For surprise bills, the DIFS surprise medical billing process and the federal No Surprises Act protections are the routes to use. And if a collector contacts you about an old medical debt, remember the six-year lawsuit clock, and be careful about partial payments that can restart it.