Remittance advice (ERA)

Updated August 2, 2026 · 8 min read

What Is a Claim Denial?

A claim denial is a payer's decision, after adjudication, to refuse payment in whole or in part — and it is not the same thing as a rejection.

Updated August 2, 2026 · 8 min read

Reading a Denial: Codes, Group Codes, and the Remittance

A denial arrives as standardized codes on the remittance advice. Reading them — the adjustment reason, the group code, and the remark — is what tells you what to do next.

Updated August 1, 2026 · 12 min read

The Levels of Appeal: Where a Denial Goes Next

An upheld appeal is rarely the end of the matter. Medicare publishes five levels, Medicare Advantage forwards a case on automatically, and most commercial coverage adds an external review the plan does not decide.

Updated July 29, 2026 · 10 min read

Duplicate Claim Denials: True Duplicate or Distinct Service?

A duplicate denial says the payer believes it already has this claim. The first move is never to resubmit — it is to find out whether the original paid, is still pending, or was itself denied, because each answer points to a different fix.

Updated July 30, 2026 · 13 min read

Medical Necessity Denials: The Coverage Policy, Not the Care

A medical-necessity denial says the payer, applying its written coverage policy, decided the claim did not establish that the service was necessary for this patient — not that the care was wrong. The response turns on the policy and the record: find the criteria that applied, decide whether it is a reporting fix or a coverage dispute, and answer with the documentation mapped to the policy.

Updated July 30, 2026 · 12 min read

Coordination of Benefits Denials: When the Payer Thinks Another Plan Is Primary

A coordination-of-benefits denial is the payer acting on its record of the patient's other coverage, not a coding error. Two denials hide under one label: the payer says another plan is primary and must pay first, or it cannot process a secondary claim because the primary's decision was not attached. The two have opposite fixes, so the first task is telling them apart on the remittance.

Non-Covered Service Denials: When the Plan Never Covered It

A non-covered-service denial says the service is not a benefit of the plan at all — not that it was unnecessary for this patient. Because there is no coverage to argue, the work is not an appeal on medical necessity: it is confirming the exclusion is real against the benefit document, settling who bears the amount, and catching the minority of cases that are actually a misadjudication of a service that is a benefit.

Updated July 30, 2026 · 15 min read

Experimental or Investigational Denials: When the Payer Calls It Unproven

An experimental-or-investigational denial says the payer, applying its plan's own definition, considers the service not yet established or proven enough for this use to be a covered benefit — a judgment about the state of the evidence, not about whether the patient needed the care or whether the service is ever a benefit. Because it turns on evidence and FDA status, which change, a meaningful share are contestable: the argument is that the service is established for this indication, and on many commercial plans an independent external reviewer can decide the question the plan does not.

Updated July 30, 2026 · 12 min read

Place of Service Denials: When the Setting Doesn't Match the Claim

A place-of-service denial says the two-digit setting code on the claim does not match what the payer expects — either inconsistent with the procedure billed (CARC 5) or judged an inappropriate or invalid setting for the treatment (CARC 58). Unlike the coverage denials in this cluster it is almost always a reporting problem rather than a judgment about the care, so the first question is not whether to appeal but whether the setting was reported correctly: a wrong code is a corrected claim, a correct code that was edited anyway is an appeal that defends the documented setting. Place of service also selects which of two payment tiers applies, so an inaccurate code is not cosmetic even when the claim pays.

Updated August 2, 2026 · 11 min read

Partial Denials: When Part of a Claim Pays and Part Is Denied

A partial denial is a denial that shares a claim with a payment. Because a payer adjudicates a claim one service line at a time, a single claim can pay some lines and deny or reduce others, so the remittance reports a deposit and a refusal at once. That makes it the easiest denial to miss — the money lands, the claim looks resolved, and the denied line disappears into a total that looks paid. Working one means separating the denied portion from the paid portion, telling a genuine denial apart from an expected contractual reduction, reading a per-line disposition rather than a claim-level one, and correcting or appealing only the affected lines without resubmitting the ones that paid.

Updated July 30, 2026 · 10 min read

Secondary Claim Denials: When the Second Plan Denies on Its Own Terms

A secondary claim is adjudicated by a second payer under its own contract, not paid out as a top-up of what the primary left. So a secondary that will not pay can mean three different things — a legitimate zero payment where coordination worked, a coordination-of-benefits breakdown, or a genuine denial the secondary made on its own coverage, network, authorization, or filing rules — and each is resolved a different way. Working one starts by reading the remittance to tell which it is, because re-sending the primary's explanation of benefits fixes only one of the three.

Corrected Claim Denied Again: Why the Resubmission Failed

A corrected claim re-enters adjudication and is judged again — resubmitting is not the same as being paid. When one denies a second time, the cause is almost always that it never registered as a replacement, that it registered but never cured the reason the original was denied, or that the denial needed an appeal rather than a correction.

Payer Medical Policy: How to Find and Read a Coverage Policy

A payer's medical policy is the written rule a plan measures a service against — the covered indications, the diagnoses and coding it expects, and the documentation it requires. Finding and reading the policy that applies, before a claim tests it rather than after it denies, is how a practice knows the coverage rule in advance instead of learning it from a denial.

Prioritizing Denial Work: Which Denials to Work First

Denials arrive faster than a team can work them all at once, each carries a filing deadline that runs from the remittance, and not all of them are recoverable — so the order they are worked in decides how much is collected. Prioritizing denial work is the triage that reads each denial's disposition and deadline before its dollar value, then sequences a finite capacity against fixed windows.

Denial Reporting by Payer

A denial report is the analytical view of the denial book — how the denials are behaving, not what to work next — and the most useful way to cut it is by the payer that produced each one, because payer behavior is the denial driver a practice cannot fix upstream. Denial reporting by payer is the design of that view: the dimensions and measures it carries, why every count needs a denominator, and how a payer's pattern is read into an action.

The Appeal Letter: What the Document Has to Contain

A reviewer decides on what is in front of them. The appeal letter is the container that carries the argument and its evidence there — and a correct argument that arrives unidentifiable, unsupported, or in the wrong queue loses like a wrong one.

Updated August 7, 2026 · 11 min read

The Timely Filing Appeal Letter: The Two Arguments That Work

A timely-filing appeal can argue exactly two things: the claim was not late, or it was late for a reason the payer's own rules excuse. It can never argue the service. And under Medicare fee-for-service there is no appeal to file at all — which makes identifying the proceeding the first step, not the letter.

Post-Service Peer-to-Peer Review: The Reviewer Call After a Denial

A post-service peer-to-peer is a clinician-to-clinician call about a claim that has already been denied — usually on medical necessity. It is not the pre-service authorization call, not every payer offers one after the service, and it never replaces the formal appeal: it is a faster route to the same independent physician review, run on its own short clock and converted into a paid claim only if it succeeds.

Updated July 30, 2026 · 13 min read

Denial Write-Off Policy: Deciding When a Denied Balance Is Written Off

Writing off a denied balance is a decision, not a default — the point at which a practice stops pursuing a payer and clears the money from its books. A denial write-off policy separates the contractual adjustment the contract always expected from the avoidable write-off that is a real, recoverable loss, makes the write-off come last, and codes every one to its cause so the avoidable losses can be counted and cut rather than buried.

Appeal Tracking and Follow-Up: Carrying a Filed Appeal to Resolution

Filing an appeal starts an obligation, not ends one: the payer now owes a decision on its own clock, and the window to take the appeal further runs from a decision the practice has to catch. Appeal tracking and follow-up is the discipline of carrying every filed appeal to a paid, escalated, or written-off resolution — so a filed appeal is not quietly lost to the payer's silence.