Marketplace Plan Appeals Through HealthCare.gov

Marketplace plan appeals are formal requests to reverse coverage, eligibility, or cost determinations made by plans sold through HealthCare.gov, the federally facilitated exchange established under the Affordable Care Act. This page covers the scope of those appeals, the administrative mechanism governing them, the scenarios that most frequently trigger disputes, and the boundaries that separate internal plan appeals from external review rights. Understanding this process matters because Marketplace enrollees hold distinct federal appeal rights that differ from those available under employer-sponsored ERISA plans or Medicare.

Definition and scope

A Marketplace plan appeal, in the federal regulatory sense, encompasses two overlapping categories: appeals against the plan itself (internal appeals) and appeals against the Health Insurance Marketplace (external eligibility appeals). Both categories arise from the ACA framework codified at 45 C.F.R. Part 155, Subpart F for eligibility determinations and 45 C.F.R. Part 147 for internal plan requirements.

Eligibility appeals challenge Marketplace decisions about enrollment, special enrollment periods, premium tax credit amounts, or cost-sharing reduction eligibility. These are administered by the Marketplace itself — through the federal exchange at HealthCare.gov or, in states running their own exchanges, through the state-based marketplace — not by the insurer.

Plan-level internal appeals challenge decisions the insurer makes: claim denials, prior authorization refusals, rescissions, or coverage terminations. Under 45 C.F.R. § 147.136, all non-grandfathered individual and group health plans, including Marketplace plans, must comply with internal claims and appeals requirements derived from ERISA § 503 and the ACA.

The scope is national. Every plan sold on HealthCare.gov in the 50 states and the District of Columbia must meet these federal minimums, regardless of whether the state has its own additional protections. For a broader look at how ACA appeal rights and deadlines apply across plan types, the underlying statutory framework is the same starting point.

How it works

The appeals pathway for a Marketplace plan follows a defined sequence. The Centers for Medicare & Medicaid Services (CMS) oversees compliance for both the eligibility appeals process and the plan-level requirements.

Internal plan appeal process (plan-level denials):

Initial claim denial — The plan issues an Explanation of Benefits (EOB) or notice of adverse benefit determination, which must specify the reason, the applicable plan provision, and the right to appeal (45 C.F.R. § 147.136(b)(2)).
Internal appeal filing — The enrollee files a written appeal within 180 days of receiving the denial notice. The plan must acknowledge receipt and conduct a full and fair review by a reviewer not involved in the original denial.
Internal appeal decision — For non-urgent claims, the plan has 30 days for pre-service appeals and 60 days for post-service appeals to issue a written decision. Urgent (expedited) appeals require resolution within 72 hours (45 C.F.R. § 147.136(b)(3)).
External review — If the internal appeal is denied or the plan fails to meet its deadlines, the enrollee may request external review through a federally accredited Independent Review Organization (IRO). The IRO's decision is binding on the plan.

Marketplace eligibility appeal process:

Eligibility appeals are filed directly with the Marketplace. Enrollees request a hearing with the Office of Medicare Hearings and Appeals (OMHA) or, depending on the dispute type, with CMS's Marketplace Appeals Center. The enrollee can request a Marketplace eligibility appeal by mail, fax, or online through HealthCare.gov within 90 days of the disputed determination.

Common scenarios

Marketplace plan appeal disputes cluster around a defined set of recurring denial types. The Kaiser Family Foundation's analysis of ACA marketplace data found that in-network claim denial rates across Marketplace issuers in 2021 ranged from under 1% to more than 80%, with an average of approximately 17% of in-network claims denied across the issuers examined — illustrating the scale of the problem.

The most frequent categories include:

Medical necessity denials — The plan asserts the treatment is not medically necessary under its criteria. This is the most litigated Marketplace appeal type and is governed by medical necessity standards that IROs evaluate against independent clinical criteria.
Prior authorization refusals — A service requiring advance approval is denied before it is rendered. These disputes are time-sensitive; see prior authorization denials and appeals for the procedural distinctions.
Out-of-network cost disputes — An enrollee receives care from a provider outside the plan's network and contests the cost-sharing calculation or reimbursement rate, particularly relevant after the No Surprises Act (Pub. L. 116-260, the Consolidated Appropriations Act, 2021, enacted December 27, 2020).
Eligibility and premium tax credit disputes — The Marketplace reduces or eliminates a premium tax credit based on income verification, triggering an eligibility appeal rather than a plan-level appeal.
Coverage rescission — A plan attempts to cancel coverage retroactively. Under 45 C.F.R. § 147.128, rescission is prohibited except in cases of fraud or intentional misrepresentation; insurance rescission appeals follow a separate sub-process.
Mental health and substance use disorder parity denials — Denials that treat behavioral health services more restrictively than comparable medical benefits may violate the Mental Health Parity and Addiction Equity Act (MHPAEA, Pub. L. 110-343). See insurance appeals for denied mental health claims.

Decision boundaries

Several categorical distinctions govern which appeal pathway applies, who decides, and how binding the outcome is.

Internal vs. external review: Internal appeals are resolved by the plan; external review is resolved by an independent IRO accredited under federal standards. Only after exhausting internal appeals — or if the plan violates its own procedural timeline — can an enrollee access external review. The IRO decision is binding on the plan but not on the enrollee, who retains the right to pursue insurance litigation after a failed appeal.

Eligibility appeals vs. plan appeals: These are handled by different bodies and have different timelines. Eligibility appeals go to the Marketplace or OMHA; plan-level appeals go to the insurer and then an IRO. Conflating the two leads to filing in the wrong venue and missed deadlines.

Grandfathered vs. non-grandfathered plans: Plans that maintained grandfather status under ACA § 1251 are not required to comply with the full internal appeals and external review requirements of 45 C.F.R. § 147.136. Grandfathered plans sold on the Marketplace are rare but do exist, and the absence of external review rights is a material difference for enrollees. For comparison, federal insurance appeal rights for grandfathered plans remain more limited.

State-based exchanges: Fourteen states and the District of Columbia operated their own exchanges as of plan year 2024 (CMS State Plan Management). Those states may layer additional protections — such as shorter insurer response deadlines or expanded external review triggers — on top of the federal floor. State insurance department oversight and state insurance department appeals remain parallel options for enrollees who also face conduct violations.

Urgent vs. standard timelines: A standard internal appeal for a post-service claim allows 60 days for insurer response; a concurrent care (ongoing treatment) or urgent/expedited appeal compresses that to 72 hours. Missing the distinction can result in an enrollee waiting weeks for a decision that should have arrived in days.

References

📜 10 regulatory citations referenced · ✅ Citations verified Feb 26, 2026 · View update log

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