After you mail the letter, the appeal clock starts.
Your appeal letter is in the envelope and on its way. Two clocks have started — the plan's response window for the internal review, and your four-month escape window to the external review / IRO body. This page walks through what happens next, surfaces the per-state deadline your letter cites, and offers a mail-day checklist and the post-purchase report-outcome link.
01 · What the insurer is doing
Three review windows — internal, external, IRO.
The day your appeal letter is postmarked, the appeal clock begins. The plan has a fixed window to acknowledge the appeal, gather the clinical file, run a full-and-fair review, and issue a determination that names the reviewer and the clinical criteria used. Your letter should cite the controlling statute on its face — that is what stops a 'failure to acknowledge' from turning into a deemed-approved outcome on the wrong side of the decision.
Once the appeal is denied at the internal stage — or the window closes without a response — a second clock starts: your right to escalate to the external review body, the state insurance department, or the federal Independent Review Organization. The deadline is state-specific and runs from the date of the plan's Adverse Benefit Determination, not the date you mailed the letter. Missing the deadline forfeits the second-stage channel.
On top of the internal and external reviews, some states add an Independent Review Organization (IRO) layer — a binding or non-binding third-party medical review. New York and California IROs are binding on the plan; Texas, Florida, and the federal-default channels are non-binding advisory bodies. Your letter cites the IRO framework that applies to the plan in front of you; the calculator on this page surfaces that framework against the deadline.
On the clock
Tex. Ins. Code § 4201.354 (TX · 30-day internal / four-month TDI), Cal. Code Regs. tit. 28 § 1300.70 (CA · 30-day / 60-day DMHC IMR), N.Y. Ins. Law §§ 3214-a / 4914 (NY · 30/60-day / binding IRO), 45 C.F.R. § 147.136 (federal · 30-day / four-month).
02 · Appeal-clock countdown
When each deadline lands for your appeal.
Pick your state and the postmark date — see the internal review deadline, the four-month external review window, and the IRO escalation timing the letter cites. State clocks are derived from the controlling statute on the letter you sent.
Set the clock
The date the appeal letter was postmarked. Today by default.
Urgent / expedited
Urgent (concurrent) review
Concurrent with care — 1-day expedited window from the day the letter is postmarked.
—d —h —m · remaining
October 5, 2026
Internal review
Standard internal review
30-day standard response window (1-day expedited for urgent care).
—d —h —m · remaining
November 3, 2026
External review / IRO
External review body
Four-month (120-day) external review window — Federal external review, the IRO or state insurance office.
—d —h —m · remaining
February 1, 2027
IRO: IRO per state program
State not listed — the calculator is using the federal 45 C.F.R. § 147.136 default. The four-month external review and 30-day internal review still apply, on most fully-insured plans.
Source: Internal appeal and four-month external review under 45 C.F.R. § 147.136 (ACA / fully-insured group).
03 · Mail-day checklist
Don't forget the certified-mail receipt.
Before the envelope goes out, work through this list — denial letter, EOB + reason code, the medical-records excerpt you reference, and the certified-mail receipt that captures the postmark. State persists in this browser only.
Mail-day checklist
What to put in the envelope before it goes out.
Track what you've gathered and what you've mailed. State is saved in this browser only — refresh-safe.
0 of 8 gathered.
The signed, dated, addressed letter — letterhead-style if you can. Sign every page.
A copy of the EOB or adverse-benefit determination — the document you're appealing.
The Explanation of Benefits line item showing the denial reason code + the dollar amount being denied.
The relevant chart notes / labs for the period in question — enough for the reviewer to act on, not the entire chart.
A letter of medical necessity from the prescribing or treating physician (for medical-necessity + coding denials).
The receipt from USPS certified mail — captures the postmark date and gives you a tracking number.
HIPAA / medical-record release form if you're filing on someone else's behalf — keep it short and signed.
Two copies of everything in your hands — the envelope you're mailing, one for your records, and a scan on your phone or in your inbox.
04 · Report outcome
Tell Denvow what the insurer did.
Once the appeal resolves — approve, deny, partial, no response — the outcome powers the case-history timeline and the next-stage windows. The post-purchase email carries the per-letter link.
Send the letter. Open the clock.
Walk into the appeal clock with a deadline in view.
The calculator above names the per-state clock; the checklist fast-loads the mail-day prep; the post-purchase email carries the per-letter report-outcome link. Pull all three up before the deadline.
Denvow is template-and-tooling, not legal counsel. For denials that need litigation, an ERISA fiduciary complaint, or a state-court remedy, we recommend counsel — and will say so when we see one.