> ## Documentation Index
> Fetch the complete documentation index at: https://mso.getlemma.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Auto insurance and PIP

> Auto/PIP profile: PIP states, medical payments coverage, attorney liens, and why PI receivables are not ordinary AR.

**Auto insurance** pays for medical treatment following motor vehicle accidents, through **personal injury protection (PIP)** in no-fault states, **medical payments (MedPay)** coverage elsewhere, or through a **third-party liability settlement**. It behaves nothing like health insurance, and the receivable behaves nothing like ordinary AR.

**Payer content ages fastest of anything on this site.** Portals move, forms change, payer IDs get reassigned, and **timely filing limits are contract-specific regardless of what any table says**. Treat this page as orientation; the payer's own current documentation and **your executed contract** are authoritative. **Checked August 2026.**

## The coverage types

| Type                            | How it works                                                                                       |
| ------------------------------- | -------------------------------------------------------------------------------------------------- |
| **PIP**                         | No-fault coverage paying medical expenses regardless of fault, in PIP states, up to a policy limit |
| **MedPay**                      | Optional coverage paying medical expenses up to a limit, regardless of fault                       |
| **Third-party liability**       | The at-fault driver's insurer pays — **at settlement, which can be years away**                    |
| **Letter of protection / lien** | The practice treats now against a claim on a future settlement                                     |

## PIP states

A subset of states operate no-fault systems with mandatory or optional PIP. Rules — including coverage limits, fee schedules, authorization, and reporting — vary substantially. **Confirm your state's system**; the difference between a PIP state and a tort state changes the whole workflow.

## Why PI receivables are not ordinary AR

**A personal injury receivable is a contingent claim on a future settlement, not an account receivable.**

|                  | Health insurance | PI / lien                                               |
| ---------------- | ---------------- | ------------------------------------------------------- |
| **When paid**    | 20–40 days       | **Months to years, at case resolution**                 |
| **How much**     | Contracted rate  | **Negotiated, frequently reduced at settlement**        |
| **Certainty**    | High             | **Low — depends on the case outcome and policy limits** |
| **Counterparty** | Payer            | Attorney, insurer, or patient                           |

**Booking PI revenue at full billed charges materially overstates your financial position.** Discount it based on your actual historical realization rate, and be prepared to show that rate in diligence. See [How investors read MSO-PC financials](/concepts/finance/how-investors-read-mso-pc-financials).

## Operational realities

**Documentation must be litigation-grade.** Causation matters in a way it does not for health insurance — the record needs to connect the treatment to the accident clearly, because it will be read by opposing counsel.

**Settlement checks are frequently joint-payee**, made out to the practice **and** the patient or the attorney. Every payee must endorse before deposit. Build a tracking log for checks awaiting endorsement. See [Handle paper checks](/guides/banking/deposit-paper-checks).

**Coordination with health insurance** is genuinely complex. Depending on the state and the coverage, PIP may be primary, health insurance may be primary, or there may be a subrogation claim. Get the order right before billing.

## Attorney relationships — a compliance note

<Warning>
  **Referral relationships with personal injury attorneys carry real legal risk.**

  Arrangements where an attorney refers patients and the practice reciprocates in some way can implicate **state anti-kickback and fee-splitting statutes** — many of which are **all-payer** and reach non-federal business — and some states have specific restrictions on medical-legal referral relationships.

  Federal AKS may not reach a pure PI practice with no federal program dollars, but that is not the end of the analysis. See [Stark and anti-kickback](/concepts/compliance/stark-and-anti-kickback).
</Warning>

## Note on the case law

Auto insurers have been among the most active private enforcers of the corporate practice doctrine, precisely because they can sue to recover payments made to unlawfully structured practices. ***Allstate Insurance Co. v. Northfield Medical Center, P.C.*** and ***Isles Wellness v. Progressive Northern Insurance Co.*** both arose in this context.

If your practice takes significant PI volume, your CPOM posture is more exposed than average. See [CPOM case law](/reference/legal/cpom-case-law).

<Note>
  🦴 PT and chiropractic practices carry the highest PI concentration of any vertical. See [Physical therapy and chiropractic](/concepts/industries/physical-therapy-and-chiro).
</Note>


## Related topics

- [The US payer landscape](/concepts/payments/the-payer-landscape.md)
- [Payers vs insurance companies (they're not synonyms)](/concepts/payments/payers-vs-insurance-companies.md)
- [Enroll and contract with commercial payers](/guides/enrollment/enroll-with-commercial-payers.md)
- [Set up EDI, ERA, and EFT with each payer](/guides/enrollment/set-up-edi-era-eft.md)
- [File appeals](/guides/billing/file-appeals.md)
- [How to use the payer reference](/reference/payers/overview.md)
- [Payer enrollment & submission links](/reference/payers/enrollment-links.md)
- [Timely filing limits by payer](/reference/payers/timely-filing-limits.md)