Patient Grievance and Appeals Process Explained

When a hospital bills for a procedure that was never performed, or an insurer denies coverage for a medication a physician already prescribed, patients are not simply out of luck. A formal system of grievances and appeals exists precisely for those moments — built from federal statutes, accreditation standards, and state regulations layered together into a mechanism that is, admittedly, more intricate than it first appears. This page maps that mechanism: what each pathway covers, how the timelines work, where the leverage points are, and what the research says about how outcomes vary depending on which door a patient walks through.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps (non-advisory framing)
• Reference table or matrix

Definition and scope

A grievance is a formal complaint submitted to a health plan, hospital, or regulatory body about the quality of care, conduct of staff, or a billing dispute. An appeal is a specific challenge to a coverage decision — a denial, reduction, or termination of a health benefit. The distinction matters practically: grievances are generally handled by the provider or plan's internal quality or member-services infrastructure; appeals trigger a legally defined review process with statutory timelines and, in most regulated contexts, an independent external review option.

The scope of these rights is broad. Under the Affordable Care Act, all non-grandfathered health plans sold in the individual and small-group markets must comply with the federal appeals framework established at 45 C.F.R. §§ 147.136–147.138. Medicare beneficiaries operate under a parallel system governed by 42 C.F.R. Part 422 (Medicare Advantage) and Part 405 (Original Medicare). Medicaid managed care plans are subject to 42 C.F.R. Part 438, Subpart F. The Joint Commission, which accredits roughly 22,000 healthcare organizations in the United States (The Joint Commission), requires accredited hospitals to maintain a grievance process as a condition of accreditation under its Patient Rights standards (RC.02.01.01 and RI.01.07.01).

State insurance commissioners layer additional requirements on top of federal minimums — some states require faster timelines, lower evidence burdens, or expanded external review eligibility. The state-specific landscape means a patient in New York faces different procedural rules than one in Texas, even for nominally identical insurance products.

Core mechanics or structure

The standard architecture has three tiers, operating sequentially.

Tier 1 — Internal grievance or appeal. A patient (or authorized representative) submits a written or verbal complaint to the plan or hospital. For insurance appeals, the plan must acknowledge receipt and render a decision within federally mandated windows: 72 hours for urgent/expedited appeals, 30 days for pre-service appeals, and 60 days for post-service (retrospective) claims appeals (45 C.F.R. § 147.136). Plans must notify enrollees of their appeal rights in every adverse benefit determination letter.

Tier 2 — External independent review. If the internal appeal is denied, federal law (and the laws of 47 states plus the District of Columbia, per the NAIC External Review Model Act) grants the right to independent external review by an accredited Independent Review Organization (IRO). IROs are selected randomly or on a rotating basis to prevent insurer influence. Federal rules require the IRO to render a final decision within 45 days for standard reviews and 72 hours for expedited reviews (45 C.F.R. § 147.138). The IRO decision is binding on the health plan.

Tier 3 — Regulatory complaint and legal action. If internal and external remedies are exhausted or unavailable, patients may file complaints with state insurance commissioners, the Centers for Medicare & Medicaid Services (CMS), or the Office for Civil Rights (OCR) under HHS. Litigation under ERISA Section 502(a) is also available for employer-sponsored plans, though ERISA preemption significantly limits damages — a tension explored below.

Hospital grievances follow a related but distinct path: hospitals accredited by The Joint Commission must provide a written response within 7 days acknowledging receipt and, where possible, resolution of the grievance. CMS Conditions of Participation at 42 C.F.R. § 482.13(a)(2) require hospitals to inform patients of their right to file a grievance and to provide the name and contact information of the relevant state agency.

Causal relationships or drivers

The appeals process exists because coverage denials are common and frequently reversed. A 2023 analysis by the Kaiser Family Foundation found that in plans offered through HealthCare.gov, insurers denied approximately 17% of in-network claims in 2021 (KFF, Claims Denials and Appeals in ACA Marketplace Plans, 2023). Of those denied claims, enrollees appealed fewer than 0.2% — yet of appeals that reached internal review, plans overturned the denial in about 59% of cases.

That reversal rate tells a structural story: the denial is often not the final word, but the friction of the appeals process — complexity, time, documentation burden — suppresses participation dramatically. Most patients do not appeal not because they believe the denial is correct but because the process appears opaque or exhausting. This is not an accident of design; it is a predictable output of a system where administrative burden falls disproportionately on the individual.

For Medicare, the Office of Medicare Hearings and Appeals (OMHA) handles the third level of Medicare appeals. According to OMHA's 2022 Annual Report, the average processing time for a standard Medicare appeals hearing significantly exceeded statutory targets due to high case volume — a systemic bottleneck that the federal government has acknowledged without fully resolving.

Classification boundaries

Not every complaint qualifies as a formal grievance or appealable adverse determination. Distinguishing the categories determines which rights apply.

An adverse benefit determination — the trigger for formal appeals — includes denial based on medical necessity, denial of a claim as not covered, and rescission of coverage. It does not include a plan's general policy decisions that have not yet been applied to a specific claim.

A grievance covers quality-of-care issues, rudeness by plan representatives, and problems with access to care or providers. It does not constitute an appeal; filing a grievance does not toll the timeline for filing an appeal, and conflating the two is a common procedural error.

ERISA-governed plans (most employer-sponsored plans) operate under federal preemption that limits state external review mandates. Fully-insured ERISA plans are subject to state external review laws; self-funded ERISA plans use the federal external review process administered through CMS. Understanding which category applies to a given plan determines which external review pathway is available.

Tradeoffs and tensions

The independent external review system is the most powerful tool in the patient's toolkit — and one of the least used. The IRO decision binds the insurer but not the patient; a patient can reject a favorable IRO decision in theory, though there is little practical reason to do so. Conversely, an IRO ruling against the patient does not foreclose a state insurance department complaint or, in some cases, litigation.

The most persistent structural tension is ERISA preemption. For self-funded employer plans — which cover roughly 65% of privately insured workers in the United States (KFF Employer Health Benefits Survey 2023) — ERISA Section 502(a) limits remedies to the value of the denied benefit plus attorney's fees. Compensatory or punitive damages for harm caused by the denial are generally unavailable under federal circuit court precedent. A patient denied chemotherapy authorization who suffers measurable harm as a result may recover only the cost of the chemotherapy — not the medical costs of the resulting deterioration. This is among the sharpest edges in the patient rights violations landscape.

A second tension involves the medical necessity standard. Plans define medical necessity contractually, and definitions vary. IROs apply their own clinical criteria, which may differ from both the treating physician's assessment and the plan's criteria. There is no single federal definition of medical necessity, meaning the same treatment can be necessary under one framework and experimental under another.

Common misconceptions

"A verbal complaint to the hospital is a formal grievance." Under The Joint Commission standards and CMS Conditions of Participation, a verbal complaint that is not resolved at the point of contact — meaning during the same visit — must be treated as a formal grievance requiring written follow-up. However, a complaint that is resolved at the point of contact may not trigger formal grievance procedures. The distinction depends on timing and resolution, not the form of the complaint.

"The 30-day appeal window starts from the date of denial." Federal rules give enrollees at least 180 days from the date of receipt of an adverse benefit determination to file an internal appeal (45 C.F.R. § 147.136(b)(2)(ii)). This is considerably longer than most people assume and longer than the plan's own decision-making window.

"External review is only for coverage denials." Federal law permits external review of adverse determinations based on medical necessity, appropriateness, or experimental/investigational status. Some state laws expand this further to include rescissions and certain billing disputes. The scope is wider than commonly understood.

"Winning an appeal guarantees payment." An upheld appeal obligates the plan to cover the service as defined in the plan document. If the provider is out-of-network or if other plan terms limit coverage, the approval may still result in significant cost-sharing for the patient.

For a broader orientation to the rights underlying these processes, the National Patient Rights Authority home provides context on the full scope of federal and state frameworks.

Checklist or steps (non-advisory framing)

The following sequence reflects the procedural steps common to most insurance appeals under federal and state law. Individual plans may impose additional requirements.

1. Obtain the adverse benefit determination in writing. Plans are required to provide written notice (45 C.F.R. § 147.136(b)(2)) that includes the specific reason for denial, the plan provision relied upon, and appeal rights.
2. Identify the type of appeal needed. Pre-service (before treatment), post-service (after treatment), or expedited (urgent medical need within 72 hours).
3. Gather clinical documentation. Treating physician's letter of medical necessity, relevant clinical guidelines (e.g., from professional societies), peer-reviewed literature if applicable.
4. Submit the internal appeal within the plan's stated deadline (at minimum, 180 days from receipt of denial under federal rules).
5. Request a copy of the plan's criteria used in the denial. Plans are required to provide the specific clinical criteria upon request.
6. Receive the internal appeal decision. The plan must issue a written determination within the applicable federal timeline.
7. File for external independent review if the internal appeal is denied. The plan's denial letter must include instructions for requesting IRO review.
8. Simultaneously or subsequently file a complaint with the state insurance commissioner or CMS if regulatory violations are suspected — these are parallel, not mutually exclusive, processes.
9. Retain all correspondence with date stamps, certified mail receipts, and documentation of phone calls (date, time, representative name).

The how to file a patient rights complaint page addresses the parallel regulatory complaint pathway in detail.

Reference table or matrix

Appeals pathway comparison by plan type

IRO = Independent Review Organization; QIC = Qualified Independent Contractor; OMHA = Office of Medicare Hearings and Appeals; MAC = Medicare Appeals Council; ALJ = Administrative Law Judge.

For patients navigating insurance denials specifically, the patient rights and insurance denials page examines the interplay between coverage contracts and appeals outcomes in greater depth. The patient advocate role page addresses how professional patient advocates engage with these processes on behalf of individuals who find the documentation requirements difficult to manage alone.

References

• 45 C.F.R. § 147.136 — Internal Claims and Appeals — Electronic Code of Federal Regulations, HHS
• 45 C.F.R. § 147.138 — External Review — Electronic Code of Federal Regulations, HHS
• 42 C.F.R. § 482.13 — Patient Rights, Conditions of Participation — CMS, Electronic Code of Federal Regulations
• 42 C.F.R. Part 438, Subpart F — Medicaid Managed Care Appeals — CMS
• 42 C.F.R. Part 422 — Medicare Advantage Organization Requirements — CMS
• KFF — Claims Denials and Appeals in ACA Marketplace Plans (2023) — Kaiser Family Foundation
• KFF — Employer Health Benefits Survey 2023, Section 10: Plan Funding — Kaiser Family Foundation
• The Joint Commission — Patient Rights Standards — accreditation standards for healthcare organizations
• OMHA — Office of Medicare Hearings and Appeals Annual Reports — HHS
• NAIC — External Review Model Act — National Association of Insurance Commissioners
• [Centers for Medicare &