Celtic denied your claim in Missouri. Here is your deadline.

You are not alone, and here is the measured version of that sentence: 1,113,385 in-network claims were denied by Celtic Insurance Company in Missouri in a single plan year. A denial rate is a fact about an insurer's book of business. It is not a judgment about you, and it is not the last word on your claim.

• Of the 8 insurers reporting a denial rate in Missouri, Celtic Insurance Company is the sixth highest at 18.8%. The highest in the state is 24.5% and the lowest is 7.5%.
• That is 0.1 percentage points above the 18.7% national average across this dataset, and 3.2 points above the Missouri average of 15.6%.
• Behind the percentage: 5,919,313 in-network claims were processed under 17 plans in Missouri, and 1,113,385 of them came back denied.
• Not one of those denials reached independent external review, the stage whose decision the plan is required by law to accept, and where nationally 32.8% are overturned.
• Its most-recorded denial reason is administrative reason at 22.3% of its categorized denials, against 22.5% nationally, a lighter share than the country as a whole. That is the denial mix, not an outcome rate.
• In Missouri, Celtic Insurance Company reported 18.8%, and the same company files in 8 other states in this file, where the rate is not the same in any of them: 28.2% in Delaware, 24% in Oklahoma, 21.4% in Alabama, down to 16.1% in Arkansas. Which state the plan was bought in moves the odds more than the brand on the card does.
• Celtic Insurance Company accounts for 58.6% of every in-network claim denied in Missouri in this file.
• By raw volume it is the 19th largest source of denials among the 158 insurer-state records in the file that report one.
• After that, its second-most-recorded reason is service excluded from the plan, 176,461 claims, 16.5% of its categorized denials.
• Third on its own list is referral required, 139,430 claims, 13% of what Celtic Insurance Company categorized in Missouri. Between them the top three account for 51.8% of its categorized denials.
• Where Celtic Insurance Company differs most from the national mix is not medically necessary: 11.8% of its categorized denials in Missouri against 4.6% across the file.
• Read the other way round: 4,805,928 of those 5,919,313 in-network claims were paid, 81.2% of everything Celtic Insurance Company processed in Missouri.
• Spread across the 17 plans it reports in Missouri, that is about 65,493 denied claims per plan, on about 348,195 claims processed per plan.
• Its reason columns add up to 1,068,808 categorized rows against 1,113,385 denials, 96% of them, and every reason share on this page is a share of that first figure rather than of the second.
• Its smallest recorded category in Missouri is benefit limit reached, 69,228 claims, 6.5% of what Celtic Insurance Company categorized there.
• Against the file as a whole, this one record is 1.3% of the 84,502,749 in-network claim denials reported by every issuer in it.

What happened to appeals

What that record means for your own Celtic Insurance Company letter, and by when. Celtic Insurance Company recorded 1,113,385 denials in Missouri and no separately reported appeal outcome, so this page cannot tell you how its Missouri appeals went, the Celtic Insurance Company rows in the plan-year 2026 release of the CMS Transparency in Coverage file, read September 5, 2026 (data.healthcare.gov). Whichever way that lands, nobody files the appeal for you, and the filing runs on a clock set by which plan you hold: an employer or Marketplace plan gives you at least 180 days from the denial notice to file the internal appeal (29 CFR 2560.503-1(h)(3)(i), carried onto individual-market coverage by 45 CFR 147.136(b)(3)(i)), while Medicare Advantage gives you 60 calendar days after you receive its notice (42 CFR 422.582(b)) and Medicaid managed care the same 60 calendar days from the date on the notice (42 CFR 438.402(c)(2)(ii)), both stages free, and the three steps above are the whole of what to do tonight, so take the date printed on your Celtic Insurance Company notice and file well inside whichever of those windows is yours. The free steps are above; the $29 kit is the same clock with the letters pre-filled for Celtic Insurance Company in Missouri. One payment. No subscription. No cut of your claim.

Celtic Insurance Company inside Missouri

Your denial did not happen in a national average. It happened in a state market, alongside 7 other insurers reporting into the same federal file, and these are that market's own figures.

• Across the whole of Missouri, the 8 insurers reporting in this file processed 12,197,986 in-network claims and denied 1,900,841 of them, a state denial rate of 15.6%. Celtic Insurance Company is one of those 8.
• That puts Missouri 23th of 30 states by denial rate, 3.1 points below the 18.7% national average, before you get to what Celtic Insurance Company did inside it.
• Missouri recorded 7,652 internal appeals against those denials: one appeal for every 248 claims the state's insurers refused.
• Independent external review was reached 53 times in the whole of Missouri, once for every 35,865 denials, against one in 14,369 nationally. None of them came from Celtic Insurance Company's denials.
• Of the Missouri external reviews that were filed, 13 were overturned, 24.5%. That percentage is measured on 53 reviews, which is why the count beside it matters more than the rate does when you are deciding whether to file against Celtic Insurance Company.
• The reason Missouri's insurers record most often is administrative reason, 456,519 claims, 25% of the state's categorized denials. Celtic Insurance Company records the same one most often, so your letter is likely to say it too.
• The other insurers a Missouri reader could have bought from run from 24.5% (Oscar Insurance Company) to 7.5% (Healthy Alliance Life Co(Anthem BCBS)). Celtic Insurance Company at 18.8% sits between the two.
• Put the two together and Celtic Insurance Company is responsible for 58.6% of every in-network claim denied in Missouri in this release, from 48.5% of the claims the state's insurers processed.
• Every Missouri figure in this section is that state's own row in the same federal file Celtic Insurance Company's numbers above come from, CMS Transparency in Coverage Public Use File (PY2026 release, PY2024 claims), data.healthcare.gov — US Government public domain, and the full Missouri page is free at /states/missouri.

What Celtic Insurance Company denies most

The most common denial reason recorded for Celtic Insurance Company plans in Missouri is administrative reason. How that denial is beaten →

The last column is each reason's share of all categorized denials nationally, so you can see where Celtic Insurance Company's mix in Missouri differs from everyone else's. This is denial mix, not overturn rate by reason, the federal file does not report appeal outcomes broken down by denial reason, and we do not imply otherwise.

The three steps at the top of this page are the whole of what you have to do tonight. The longer version, what the internal appeal has to contain, how the independent stage works, and how to ask for expedited handling when waiting would seriously jeopardize your health, is published free here.

Who appeals what at Ambetter (Centene), the insurer's own routing table

Ambetter (Centene) publishes a table of which denial scenarios are appealed by you, the member ("customer appeal") and which only your health care provider can appeal. Almost no patient ever sees it, and appealing a denial that only your provider has standing to appeal burns time inside a fixed window. Quoted from Ambetter (Centene)'s published policy (a page written for health care providers (Texas plan page)), checked 2026-08-25. It is brand-level and applies to Celtic Insurance Company in Missouri the same as to every other Ambetter (Centene) entity in the file.

Operational facts from the same policy

• Medical-necessity appeal window: 180 calendar days
• Standard resolution clock: 30 calendar days
• Expedited appeal clock: 1 working day / 72 hours from complete information
• Submission (Texas plan): Complaints Department, 5900 E. Ben White Blvd., Austin, TX 78741 · Fax 1-866-683-5369 , Texas plan's address — each state plan publishes its own.
• Member appeal window: 180 calendar days, orally or in writing , Member-side confirmation of the 180-day window; also confirms the 30-day resolution clock ('shall not exceed 30 calendar days from the date Ambetter receives the appeal') and the expedited 1-working-day / 72-hour-written clock.
• Member APPEALS address differs from the complaints address: Appeals Department, 5900 E Ben White Blvd., Austin, TX 78741 · Fax 1-866-918-2266 , Same street address as the Complaints Department but a different fax: appeals go to 1-866-918-2266, grievances/complaints to 1-866-683-5369. The plan page's complaints fax is not the appeals fax.
• External review via MAXIMUS: four months from the final internal decision; standard decided ≤45 days, expedited ≤72 hours , Route: Externalappeal.com, fax 1-888-866-6190, or mail to MAXIMUS Federal Services, 3750 Monroe Avenue, Suite 705, Pittsford, NY 14534. Matches the federal 4-month right this site publishes.

Sources: Ambetter (Centene), "Grievance and Appeals (Ambetter from Superior HealthPlan, Texas)", quoted, not paraphrased; audience: health care providers (Texas plan page); checked 2026-08-25. Ambetter (Centene), "Appeals and Grievances Guide (Ambetter from Superior HealthPlan, Texas — member guide, last updated December 2024)", quoted, not paraphrased; audience: members; checked 2026-08-26. Brand-level policy, applied here because Celtic Insurance Company is an Ambetter (Centene) entity. Your own denial letter and plan documents govern your specific case.

Questions

Everything you need for your Celtic Insurance Company appeal in Missouri: your two deadlines, the argument that fits your denial reason, the letters, the clinician brief, and the external review request. One payment. No subscription. No cut of your claim. Opens on screen the moment you pay. 14-day refund, no questions, one email to hello@getaxionlabs.com.