Why did my continued-stay (concurrent) review get denied — and how do I appeal it?

What is a continued-stay (concurrent) review, and why did mine get denied?

A concurrent review is the payer’s mid-treatment check on whether ongoing care still meets medical necessity — run during the stay, not after it. A denial means the reviewer concluded that the documentation no longer supports the current level of care. The reasons are predictable once you have seen them repeat: the clinical record didn’t demonstrate continued medical necessity against the criteria, the level of care looked like it could step down, or the required clinical update was late or missing.

Behavioral health carries more of this burden than most of medicine because more of the care requires the payer’s ongoing sign-off. Partial hospitalization (PHP), intensive outpatient (IOP), residential, and detox are billed largely per diem, and the payer re-checks medical necessity every few days. Each review is a point where it can refuse to keep paying for care you are in the middle of delivering.

The standard the reviewer applies is usually the ASAM Criteria (the framework for matching addiction severity to a level of care) for substance use, or MCG / InterQual and the plan’s own medical policy on the mental-health side. Generalist billing shops routinely miss the cadence these reviews demand — and a missed or thin continued-stay submission becomes a denial that ages while no one works it.

What does a concurrent review denial actually turn on?

The specific criteria set the payer applied, and whether your documentation maps to it. For substance use levels of care that is usually the ASAM Criteria; commercial plans often use MCG or InterQual; some apply their own medical policy. The denial is a finding that the record, as submitted, did not meet that standard — which means the appeal is won on the record and the criteria, not on a general argument that the patient needs treatment.

In practice the reviewer is matching your notes to a multidimensional assessment — withdrawal and biomedical risk, psychiatric and behavioral status, readiness to change, relapse potential, and the recovery environment. Gaps read as “not medically necessary at this level”: no documented withdrawal risk, no rationale for why a lower level of care would be unsafe, or no measurable lack of progress that justifies the current stay. None of that is an argument about intent; it is whether the contemporaneous record demonstrates the criteria.

This is why the same clinical picture can be paid at one facility and denied at another. The care may be identical; the documentation against the applicable standard is not. Knowing which criteria a given payer applies — and citing it back by name — is most of the work.

How do you appeal a continued-stay review denial, step by step?

Move in escalating order, fastest first: request a peer-to-peer (P2P) — your clinician to the payer’s reviewer — ideally while the patient is still in care; if that fails, file a written internal appeal built against the exact criteria the payer applied; and if the internal appeal is upheld, request an external (independent) review. Each step has its own deadline, and the first one is often measured in days.

The P2P is frequently the fastest reversal, because it happens in real time: a same-day or next-day call, clinician to reviewer, while the documentation and the patient are both still in front of you. The window is short and payer-set, so it is the easiest step to miss and the most valuable to catch. When a P2P doesn’t turn it, the written internal appeal presents the clinical record against the standard — naming the ASAM dimensions or the policy provision the stay meets — rather than restating that care is needed.

Internal appeals are upheld more often than not — KFF found insurers upheld about 66% of appealed denials — so the external review is not a formality. For most commercial and marketplace plans, federal law lets you take a denied internal appeal to an independent external review by a reviewer not employed by the plan, whose decision the plan must follow. A continued-stay denial is one piece of the broader work of recovering denied behavioral health claims, where the same triage applies.

What documentation actually wins the appeal?

The contemporaneous clinical record, mapped explicitly to the criteria the payer used. That means date-stamped progress notes, the treatment plan and its updates, risk and withdrawal assessments, and a clear rationale for why a lower level of care would be unsafe or has already failed — presented against the standard, not as a narrative of good intentions.

Concrete beats persuasive. A reviewer overturns a denial when the record shows the specific findings the criteria ask for: measurable risk, a documented failed trial at a lower level of care, continued symptoms that a less intensive setting can’t safely manage. The catch is that the record has to already exist — a concurrent denial exposes a documentation gap in real time, and you cannot back-fill a note you didn’t write. That is why the utilization-review cadence during the stay, not the appeal after it, is where these claims are actually won or lost.

Does mental health parity (MHPAEA) help with a concurrent review denial?

Sometimes — as a benefit-design argument, not a per-claim fix. Concurrent review is itself a nonquantitative treatment limitation (NQTL), so if a plan reviews behavioral health stays more aggressively than comparable medical or surgical stays, that disparity can support a parity challenge. But most individual concurrent denials are still won on documentation and the payer’s own criteria, so build the appeal on the record first and treat parity as one tool, not the lever for every claim.

Keep the current state of parity straight, because it changed recently: as of May 2025, federal regulators paused enforcement of the 2024 MHPAEA Final Rule’s new provisions, while the underlying parity statute and the 2013 rule remain in force. Parity can still matter for behavioral health denials broadly — see the homepage questions on denials, parity, and concurrent review — but it is rarely the fastest path to overturning a single continued-stay denial.

Should you work concurrent reviews in-house or hire a specialist?

It depends on whether your team has the time and the behavioral-health payer knowledge to handle reviews on the payer’s clock. Concurrent reviews are time-sensitive and land while clinicians are busy delivering care, so the P2P window is the easiest thing to miss. A specialist adds capacity and payer-pattern knowledge — and on a contingency model, the cost comes out of money that was otherwise going to be written off.

The economics explain why so much goes unworked. Industry analyses citing AHIMA Journal data estimate that 35% to 60% of denied or returned claims are never resubmitted, and reworking a single denied claim costs roughly $25 to $181. A busy in-house team triages continued-stay appeals last, and the window closes. The practical test is simple: can the people working your reviews name how your specific payers behave on concurrent review and level-of-care denials? If your patterns are a learning project for them, the recoverable claims will keep aging while they learn.

Key takeaways

• A concurrent (continued-stay) denial is not final — it is an appealable finding that the documentation didn’t meet the criteria, not a verdict that care wasn’t needed.
• The denial turns on the specific criteria set (ASAM, MCG/InterQual, or the plan’s policy) and whether the record maps to it — so the appeal is built on the record and the standard.
• Appeal fastest-first: peer-to-peer while the patient is still in care, then a written internal appeal, then an independent external review.
• The P2P window is short and payer-set — it is the easiest step to miss and often the fastest reversal.
• Parity (MHPAEA) can challenge review practices as a benefit-design argument, but most single denials are won on documentation; the 2024 rule’s new provisions are paused as of May 2025.
• Continued-stay appeals are time-sensitive and get triaged last in-house — specialist payer knowledge and contingency pricing are what get them worked before they age out.