Centene: Timely Filing, Appeals, and Billing Guide
Centene is the largest US Medicaid managed-care organization, operating Medicaid, Medicare Advantage, and ACA marketplace plans under brands like Ambetter, Wellcare, and many state-specific names. Because its business is state-contract driven, timely-filing limits vary by state and plan — commonly 90 to 365 days — so confirm the window in the specific plan's provider manual.
- Type
- Medicaid MCO, MA (Wellcare), ACA (Ambetter)
- Timely filing
- Varies by state/plan (~90-365 days)
- Appeal deadline
- State/plan specific
- Portal
- Availity / plan-specific portals
What is Centene?
Centene is the largest Medicaid managed-care organization in the country, plus a major player in ACA marketplace coverage and Medicare Advantage. It grew by acquisition, so it operates as a holding company over dozens of brands rather than one uniform payer — Ambetter for the exchanges, Wellcare for Medicare, and a sprawl of state-specific Medicaid plans.
For billers, "Centene" on a claim rarely appears as such. You bill Ambetter, Wellcare, Sunshine Health, Superior HealthPlan, or another brand, each with its own identity.
What are Centene\'s timely filing and appeal deadlines?
They are state- and plan-driven. Medicaid filing follows the state contract; Ambetter and Wellcare follow their own product rules. Windows commonly range from 90 days to 12 months.
How do you submit to Centene brands?
Identify the exact plan from the member card first. Many brands run on Availity, but payer IDs and some portals differ by brand and state. Submit through your clearinghouse to the brand-specific payer ID, and appeal through that brand's portal.
For Medicaid brands, remember Medicaid is the payer of last resort — resolve coordination of benefits before billing, same as any Medicaid plan.
What billing quirks should you watch?
- Brand, not Centene. Bill Ambetter/Wellcare/state Medicaid names, each with its own ID and rules.
- State-contract driven. Medicaid deadlines follow the state, not a national Centene policy.
- Ambetter ACA quirks. Marketplace grace-period rules can suspend payment for premium-delinquent members.
- Compare with Molina. Similar Medicaid-MCO model, different footprint and rules.
Frequently asked questions
It varies by state and plan. Centene runs Medicaid plans under state contracts, Wellcare Medicare Advantage, and Ambetter ACA marketplace plans, each with its own filing window (commonly 90 days to 12 months). There is no single Centene number — confirm it in the provider manual for the specific brand and state the member is enrolled in.
Centene operates dozens of brands. The most recognizable are Ambetter (ACA marketplace), Wellcare (Medicare Advantage and Part D), and a long list of state-specific Medicaid plans such as Sunshine Health, Buckeye Health, Peach State, and Superior HealthPlan. Each brand can have its own payer ID, portal, and rules even though Centene owns them all.
Many Centene plans use Availity, but some use plan-specific portals, and payer IDs differ by brand and state. Identify the exact plan from the member card, then work from that plan's provider manual for the payer ID, submission portal, appeal deadline, and mailing address. Applying one Centene brand's rules to another is a common error.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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