> ## 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.

# UnitedHealthcare (and the Optum ecosystem)

> UnitedHealthcare profile: corporate structure including Optum and Change Healthcare, enrollment, portals, behavioral carve-out, and the vertical integration consideration.

**UnitedHealthcare** is the insurance arm of UnitedHealth Group, the largest healthcare company in the US by revenue. What distinguishes it operationally is the rest of the group: **Optum** encompasses care delivery, pharmacy benefit management, analytics, and — following the 2022 acquisition — **Change Healthcare**, one of the largest clearinghouses in the country.

**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.**

## Who they are

|                                       |                                                                                                                                                       |
| ------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Parent**                            | UnitedHealth Group                                                                                                                                    |
| **Lines of business**                 | Commercial (fully-insured and ASO), Medicare Advantage, Medicaid, Individual/Exchange, TRICARE administration in some regions                         |
| **Related entities you'll encounter** | Optum (care delivery, PBM, analytics), **Change Healthcare** (clearinghouse), **Optum Behavioral Health** (behavioral carve-out), Optum Pay (EFT/ERA) |

## Plan types on the card

Commercial PPO, EPO, HMO, and POS; **UnitedHealthcare Choice / Choice Plus / Options PPO** network names; Medicare Advantage plans; Medicaid plans under state-specific brands; and a large volume of **self-funded ASO** business where UnitedHealthcare administers but the employer bears risk.

**A large share of UnitedHealthcare volume is self-funded.** That changes the governing law — ERISA, with state prompt-pay and external review largely preempted. Determine funding status before escalating or citing a state statute. See [Payers vs insurance companies](/concepts/payments/payers-vs-insurance-companies).

## Enrollment and credentialing

Start at [**uhcprovider.com**](https://www.uhcprovider.com/). Portal access uses a One Healthcare ID. Credentialing generally pulls from CAQH — authorize UnitedHealthcare in the clinician's profile and keep attestation current.

## EDI, ERA, and EFT

* **EDI** — through your clearinghouse; payer IDs are clearinghouse-specific
* **ERA and EFT** — commonly via **Optum Pay**
* Confirm ERA is routed to your **current** clearinghouse

## Portal capabilities

Eligibility, claim status, prior authorization, claim reconsideration, and remittance access. Substantial functionality is available without calling, which is worth training staff on.

## Appeals

Reconsideration followed by formal appeal, with the process differing between commercial, Medicare Advantage, and Medicaid lines. **Medicare Advantage appeals follow the federal MA track**, not UnitedHealthcare's commercial process.

## Quirks worth knowing

* **The behavioral carve-out.** Contracting with UnitedHealthcare medical does **not** get you into the behavioral network. Optum Behavioral Health requires separate contracting and credentialing.
* **Multiple product lines, multiple contracts.** Commercial, MA, and Medicaid participation are separate.
* **Prior authorization requirements are extensive** and change; check the current list rather than a saved copy.

## The vertical integration consideration

<Warning>
  UnitedHealth Group owns both the largest payer and, through Optum, one of the largest clearinghouses. If your claims to UnitedHealthcare flow through Change Healthcare, one corporate parent sits on both ends.

  This is a legitimate factor in clearinghouse selection — not a reason to avoid the payer, but a reason to think about where your claim data flows. The **February 2024 Change Healthcare ransomware outage**, which stopped claim submission and remittance for a large share of US practices for weeks, made the concentration concrete. See [The clearinghouses, compared](/reference/vendors/clearinghouse-comparison).
</Warning>


## 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)