Appeal Timelines Every Practice Needs to Know

A denied claim with strong clinical evidence and a well-written appeal letter is worth nothing if it arrives one day past the filing deadline. Yet missed appeal timelines remain one of the most common — and most preventable — reasons practices abandon revenue they have every right to recover. The appeal window is not a suggestion. It is a hard cutoff, and payers enforce it without exception.

Understanding the timeline landscape across payers, plan types, and appeal levels is not optional. It is foundational to any functioning denial management process.

Why Timelines Are the First Thing to Check

When a denial arrives, the instinctive reaction is to assess the clinical merits: was this denial justified? Is there evidence to overturn it? Those questions matter, but they are the second priority. The first question — always — is: how much time do we have?

A practice that spends three weeks building a thorough appeal only to discover the filing window closed last Tuesday has wasted those three weeks entirely. The appeal will not be considered. The revenue is gone. No amount of clinical evidence can overcome a procedurally defaulted deadline.

According to a 2023 MGMA poll, timely filing and appeal deadline tracking were among the top three administrative challenges cited by practice managers. The complexity is real: different payers, different plan types, and different appeal levels all carry different deadlines, and those deadlines are often buried in provider manuals that run hundreds of pages.

Commercial Payer Timelines

Commercial insurance plans set their own appeal deadlines, typically outlined in the provider contract or the plan's provider manual. While there is variation, common patterns emerge:

• First-level internal appeal: 60 to 180 days from the date of the initial denial notice. The most common window is 90 days, though some plans allow 180 days.
• Second-level internal appeal: 60 to 90 days from the first-level appeal determination. Not all plans offer a formal second level — some move directly to external review after the first-level decision.
• External review: Typically 60 to 120 days from the final internal appeal decision, depending on state regulation.

Critical detail: the clock generally starts from the date printed on the denial notice, not the date you received it. If mail takes five business days to arrive, you have already lost nearly a week. For practices that receive EOBs electronically, this is less of an issue, but many smaller practices still receive paper remittance advice.

Medicare Timelines

Original Medicare (Parts A and B) follows a structured five-level appeal process with clearly defined timelines set by CMS:

1. Redetermination by the MAC: 120 days from the date of the initial determination.
2. Reconsideration by a QIC: 180 days from the redetermination decision.
3. Administrative Law Judge (ALJ) hearing: 60 days from the QIC reconsideration. Requires the amount in controversy to meet the annual threshold ($180 in 2024).
4. Medicare Appeals Council review: 60 days from the ALJ decision.
5. Federal district court review: 60 days from the Appeals Council decision. Requires meeting a higher amount-in-controversy threshold ($1,840 in 2024).

Most physician practices will only engage with levels one and two. The ALJ hearing backlog has historically been severe — the Office of Medicare Hearings and Appeals has reported wait times exceeding a year in some periods — though targeted efforts have reduced the backlog in recent years.

Medicare Advantage Timelines

Medicare Advantage plans add their own layer of complexity. While CMS mandates certain timeline requirements, MA plans also have their own internal processes:

• Standard organization determination: Plan must decide within 14 calendar days (72 hours for expedited requests).
• First-level appeal (reconsideration): Must be filed within 60 days of the initial determination. Plan must decide within 30 calendar days (72 hours for expedited).
• Second-level appeal (IRE review): Automatically forwarded if the plan upholds its denial. The Independent Review Entity must decide within 30 days.
• ALJ hearing: 60 days from the IRE decision, with the same amount-in-controversy thresholds as Original Medicare.

The important distinction: Medicare Advantage timelines are measured in calendar days, not business days. Weekends and holidays count. A denial received on a Friday with a 60-day appeal window does not give you 60 business days — it gives you 60 calendar days, period.

Medicaid Timelines

Medicaid appeal timelines vary significantly by state, as each state administers its own Medicaid program (or delegates to managed care organizations). General patterns include:

• Appeal filing windows ranging from 20 to 90 days, depending on the state and managed care plan.
• Fair hearing requests typically must be filed within 90 to 120 days.
• Expedited appeal options when delay would jeopardize the patient's health.

Practices that serve Medicaid populations in multiple states face particular complexity. There is no substitute for knowing the specific requirements of each state Medicaid program and each managed care organization within that state.

State Insurance Regulations

Beyond plan-specific timelines, state insurance departments impose their own requirements on appeal processes. Many states have enacted laws that:

• Mandate minimum appeal windows that override shorter payer timelines.
• Require expedited review timelines for urgent clinical situations.
• Establish independent external review processes with their own filing deadlines.
• Specify the format and content requirements for appeal submissions.

California, for example, requires health plans to provide at least 180 days for standard internal appeals. Texas mandates specific turnaround times for utilization review decisions. Illinois requires external review organizations to render decisions within 45 days for standard cases. These state-level protections can work in your favor — but only if you know they exist.

Building a Timeline Tracking System

Given this complexity, ad hoc tracking — sticky notes, mental reminders, informal spreadsheets — is a liability. Practices need a systematic approach to deadline management:

• Capture the denial date immediately. The moment a denial arrives, the appeal clock is already running. Log the denial date, the appeal deadline based on that payer's rules, and the responsible staff member.
• Build payer-specific deadline references. Create a reference document that lists appeal timelines for each payer your practice works with. Update it annually when contracts renew.
• Set escalation triggers. If an appeal has not been submitted by 50% of the available window, it should automatically escalate to a supervisor. Waiting until the last week creates unnecessary risk.
• Track calendar days, not business days. Unless the payer's contract explicitly specifies business days, assume calendar days. It is the safer assumption.
• Document everything with timestamps. If a deadline dispute ever arises, you need proof of when you received the denial and when you submitted the appeal. Fax confirmations, electronic submission timestamps, and certified mail receipts all serve this purpose.

The Cost of Missing a Deadline

There is no partial credit for a late appeal. A denial that could have been overturned with strong clinical evidence becomes permanent revenue loss the moment the appeal window closes. Multiply that by the dozens or hundreds of denials a practice receives each month, and the cost of poor timeline tracking becomes substantial.

The timeline is not where you win the appeal. But it is absolutely where you can lose the right to try.