The 13 documents, compared
What each is, what it does not prove, the neutral next step, and any timing. Read against your own paperwork.
| Document | What it is | What it starts / doesn't prove | Neutral next step | Clock / keep |
|---|---|---|---|---|
| Explanation of Benefits (EOB)Processing summary; check for denial instructionsCMS_eobHCgov_internaleCFR_5031 | Not a bill; may include a denial | ShowsHow the plan processed a claim — billed, allowed, plan-paid, and your share. It can reveal that something wasn't covered, which is the cue to look for the formal determination. Doesn't proveThat no appeal clock is running. An EOB can include a denial notice; check its reasons, review instructions and date of receipt. |
Compare the EOB with the provider's bill and payment records. If it shows a denial, read all attached instructions promptly and ask the plan about anything missing; do not wait for a separate letter. | Keep with the claim file |
| Denial letter / adverse benefit determinationthe clock-starterCCIIO_appealsHCgov_internal | Starts the appeal clock | ShowsThe plan's formal denial. It must state the reason for the denial, your right to an internal appeal, your right to external review, and the availability of your state's Consumer Assistance Program — and its arrival generally starts your 180-day window to file the internal appeal. Doesn't proveFinality: a first denial is the beginning of the documented process, not the end of it. |
Keep the notice and its date, read the stated reason carefully, and mark the filing deadline it creates the day it arrives. | Internal filing window runs from this notice |
| Plan internal appeal instructionsthe mechanicsHCgov_internal | The plan's own how-to | ShowsWhere and how the plan accepts appeals — required forms, the address or portal, and any internal levels. The plan documents and the denial notice together control the mechanics. Doesn't proveThe federal floor: the instructions set procedure, but they can't shorten the rights the rules guarantee. |
Follow the plan's stated process exactly — wrong-channel filings are where deadlines get missed for no reason. | Procedure lives here |
| Internal appeal requestyour filingHCgov_internal | File within 180 days | ShowsYour formal ask for the plan to conduct a full and fair review of its denial — generally due within 180 days (6 months) of receiving the denial notice, on the plan's forms or in writing with your name, claim number, and member ID. Doesn't proveApproval, or even receipt — which is what the acknowledgment and your own submission record are for. |
File in writing within the window, attach the supporting documents, and keep a dated copy of everything sent; your state's Consumer Assistance Program can file for you. | 180 days from the denial notice |
| Medical records / provider statementthe evidence, not the appealHCgov_internal | Supporting evidence | ShowsThe clinical support behind the appeal — records, test results, and a letter from the treating doctor addressing the stated denial reason. Doesn't proveA filed appeal: evidence supports the request but doesn't replace it. Sending records without the appeal filing starts nothing. |
Ask the provider for records and a statement that speaks to the denial reason, and submit them with — or referenced to — the appeal filing. | Attach to the filing |
| Urgent / expedited appeal requestthe fast trackCCIIO_appealseCFR_5031eCFR_147136HCgov_internal | 72-hour decision lane | ShowsThe request to decide faster because the standard timeline would seriously jeopardize your life, health, or ability to regain maximum function — urgent-care appeals are decided within 72 hours, and in urgent situations the internal appeal and external review can run at the same time. Doesn't proveAutomatic qualification: urgency is a defined standard, and non-urgent cases run on the standard clocks. |
If the situation is urgent, say so explicitly in the filing and request the expedited track — and note that you may file the external review request simultaneously. | 72 hours · can run both stages at once |
| Internal appeal acknowledgmentproof the clock turned overHCgov_internal | Receipt, not result | ShowsThat the plan received the appeal — the reference point for the plan's own decision deadline, which runs in days from the request, not from the original denial. Doesn't proveAnything about the outcome; it confirms the review started. |
Keep it with your dated submission record, and note the decision-due date it implies. | Decision clock runs from receipt |
| Internal appeal decisionthe plan re-decidesCCIIO_appealseCFR_5031HCgov_internal | Written, on a deadline | ShowsThe plan's written answer to the appeal. The general federal baseline is 30 days before care, 60 days after care, and a decision as soon as possible within 72 hours for urgent care; plans with two review levels have shorter per-level periods, and some plan-specific rules differ. Doesn't proveThe end of the road: this is still the plan reviewing the plan. An adverse answer here is what opens the external stage. |
Read whether the decision is favorable, partial, or adverse — and if adverse, look for the final-determination language and the external-review instructions it must carry. | 30d pre-service · 60d post · 72h urgent |
| Final adverse benefit determinationthe exhaustion documentHCgov_externalHCgov_internal | Opens the external window | ShowsThe plan's final internal answer upholding the denial. It is the document that shows the internal process is exhausted, it must tell you how to ask for an external review — and it generally starts your 4-month window to request one. Doesn't proveThat the denial will stand: it ends the plan's own process, not the review path. |
Mark the external-review deadline the day this arrives, and follow the request instructions the determination itself must contain. | External window runs from this notice |
| External review requestmoving outside the planHCgov_externaleCFR_147136 | 4 months, in writing | ShowsYour written request — generally due within 4 months of the denial or final determination — that puts the case before a reviewer independent of the plan, via the federally administered process or your state's process, per your notice. A representative such as your doctor may file it for you. Doesn't proveEligibility by itself: the request undergoes a preliminary review before assignment, which the eligibility notice answers. |
File through the channel named in your denial or final determination and check current HealthCare.gov external-review guidance immediately before filing. Temporary HHS-administered process or deadline notices can change faster than this route’s 60-day evidence cycle; verify their dates and scope instead of relying on a cached notice. | 4 months from the determination |
| External review eligibility noticedoes the case qualifyeCFR_147136 | The gatekeeper answer | ShowsThe preliminary-review answer: whether the request is complete and the denial is the kind external review covers, and that the case is being assigned to an independent review organization. Doesn't proveThe merits — eligibility says the case will be reviewed, not how it will come out. |
If the notice says the request is incomplete, supply what's missing within the time it states; if ineligible, the notice explains why and what remains. | Respond within the notice's window |
| Independent review organization decisionthe binding stageHCgov_externaleCFR_147136CCIIO_appeals | Binding on the insurer | ShowsThe independent reviewer's decision — due within 45 days for standard review, 72 hours for expedited (with written confirmation within 48 hours if delivered orally). This is the stage with different power: the insurer is required by law to accept the external reviewer's decision. Doesn't proveA new claim: it decides the dispute that was submitted, on the record that was submitted. |
Keep the decision with the full file; if it overturns the denial, the plan must provide the payment or services the claim sought. | 45 days standard · 72 hours expedited |
| State / federal external review program noticewhich track applieseCFR_147136HCgov_external | Names your process | ShowsWhich external-review track governs your case — a state process meeting federal standards or a federal process — as stated in your denial documents. HealthCare.gov is the current authority for any temporary HHS-administered process availability notice; this route intentionally does not copy that volatile jurisdiction/status list. Doesn't proveIdentical procedure everywhere: state processes vary in their details within the federal floor, and your notice's instructions are the operative ones. |
Use the process your own notice names and check the current HealthCare.gov external-review notice immediately before filing. If HHS posts a temporary availability or deadline notice, follow that current notice and your plan or issuer instructions rather than a cached list here. | Your notice names the track |
Two stages, two different powers
The internal appeal and the external review look similar on paper — both are requests with deadlines — but they hold different power. The internal appeal asks the plan to conduct a full and fair re-decision of its own call, and the plan's answer can still be adverse. The external review moves the case to an independent reviewer outside the plan, and that decision the insurer is required by law to accept: if the reviewer overturns the denial, the plan must provide the payment or services.
The final adverse benefit determination normally records completion of the internal appeal and explains the external-review process. Urgent cases can qualify for simultaneous internal appeal and external review. Other exceptions, including waiver or deemed exhaustion under applicable rules, may also remove the need to finish the internal process; ask the plan or Consumer Assistance Program which path applies.
Where each clock comes from
No single deadline governs the chain — each window is started by a specific document:
- The denial notice starts the internal filing window — generally 180 days (6 months) from receiving it.
- The plan's receipt of your appeal starts the general decision clock: as soon as possible within 72 hours for urgent care, 30 days before care, or 60 days after care. Two-level plans have shorter per-level periods, and some plan-specific rules differ.
- The final adverse determination starts the external window — a written request generally within 4 months.
- The reviewer's receipt of the request starts the decision clock: no later than 45 days standard, 72 hours expedited.
What this page cannot determine
The chain above is the federal baseline for ACA-era private plans, and several things vary:
- Your plan's exact procedures and levels. Read the plan documents and your notices together with applicable law. Plans with two internal review levels have different per-level timing, and some plan-specific rules differ; confirm the applicable procedure promptly.
- Which external-review track applies. State-run or federally administered depends on your plan type and state — your notice names it.
- Whether these rules apply at all. Some plans retain grandfathered status and are generally outside these ACA appeal requirements, but specified surprise-billing disputes still have external-review rights. Medicare and Medicaid have separate systems. Confirm the plan and type of claim instead of relying on the plan’s creation date alone.
- The merits of any appeal. This page maps the documents and clocks; it cannot evaluate a denial, a treatment, or a case.
Checklists
The neutral, document-focused version — what to gather and verify, not what to argue.
File Building the appeal file
- Keep the denial notice and its date — every clock traces back to a dated document.
- Keep copies of everything you send and receive, including envelopes and portal confirmations.
- Put the claim number and member ID on every page and message.
- Get the provider's records and statement addressed to the stated denial reason.
- Submit by a method with a dated record and keep the acknowledgment.
Clock Deadline triage on each document
- Denial notice arrives → mark the 180-day internal filing date.
- Appeal filed → note the plan's decision-due date (72h / 30d / 60d).
- Final adverse determination arrives → mark the 4-month external-review date.
- Urgent situation → request the expedited track, and consider filing external review simultaneously.
- A notice gives conflicting or shorter instructions → act promptly and ask the plan or Consumer Assistance Program to clarify; do not assume a notice overrides applicable rights.
Common wrong assumptions
- An EOB cannot start an appeal clock; I can wait for a separate denial letter.An EOB may include the denial notice and appeal instructions. Read the whole packet and record receipt; do not assume a separate letter will arrive or restart the filing window.
- The plan's appeal decision is the final word.An adverse internal decision opens the external stage. The independent reviewer's decision is the one the insurer is required by law to accept.
- External review is just another letter to the insurer.It moves the case outside the plan to an independent review organization, through the federally administered process or your state's process — and its outcome binds the plan.
- Every appeal runs on the same leisurely clock.Urgent-care appeals are decided within 72 hours, and in urgent situations the internal appeal and external review can be filed at the same time.
- These rules cover every health plan.Plan type and claim type matter. Grandfathered plans are generally outside these ACA requirements, with external-review protections for specified surprise-billing disputes; Medicare and Medicaid use separate systems. Check the applicable rules and notice.
Sources
Every term and mechanism traces to a primary regulator. Rules change — the date is when each was last checked.
| Source | What it establishes | Checked |
|---|---|---|
| HealthCare.gov — Internal Appeals | The 180-day internal-appeal filing window from receipt of a denial notice, supporting EOB or denial records, written final decisions and external-review instructions. The page gives 30-day pre-service and 60-day post-service appeal baselines and describes simultaneous urgent review; urgent decision timing here is sourced separately to CMS and 29 CFR 2560.503-1. | 2026-10-18 |
| HealthCare.gov — External Review | External review requests are due within four months of the denial notice or final determination; standard review is due no later than 45 days and expedited review no later than 72 hours; the insurer must accept the external reviewer decision. This HealthCare.gov page is also the current authority for temporary HHS-administered process availability or deadline notices; those volatile operational details are intentionally linked rather than restated on this 60-day route. | 2026-10-18 |
| CMS CCIIO — Appealing Health Plan Decisions | Denial reasons, appeal rights and Consumer Assistance Program information; the general internal-appeal decision baselines of 72 hours for urgent care, 30 days before care and 60 days after care; payment or services following a successful external review. Plan scope and exceptions are checked against 45 CFR 147.136. | 2026-10-18 |
| 45 CFR § 147.136 — Internal Claims and Appeals and External Review Processes | The state and federal external-review frameworks: four-month filing, preliminary eligibility review, standard 45-day and expedited 72-hour decisions, 48-hour written confirmation after an oral expedited decision, binding effect and available legal remedies. It also describes exhaustion exceptions and external review for specified surprise-billing disputes in grandfathered plans. | 2026-10-18 |
| CMS — Explanation of Benefits (EOB) | An EOB is a claim-processing summary, not a bill; it explains billed, allowed, plan-paid and patient-responsibility amounts. It does not establish that a denial must arrive in a separate document. | 2026-10-18 |
| 29 CFR § 2560.503-1 — Claims Procedure | Denial notices describe reasons, review procedures and time limits; covered group health claimants receive at least 180 days to appeal. Urgent review is as soon as possible within 72 hours. One-level pre-service and post-service appeals have 30-day and 60-day limits; two-level plans and certain multiemployer plans have distinct timing rules. | 2026-10-18 |