Concurrent Review and Inpatient Authorization: What Happens After the Admission Is Approved

Published October 28, 2026

An inpatient authorization does not always cover the whole hospital stay. Many health plans perform concurrent review while the patient is still in the hospital, using updated clinical information to decide whether continued inpatient coverage is appropriate and whether the patient still needs the same level of care. For hospital utilization review and revenue cycle teams, that means the initial admission approval and each continued-stay decision have to be tracked separately.

Aetna defines concurrent review as a type of utilization management that takes place while a patient is actively receiving treatment, such as during a hospital stay. Its reviewers collect information from the care team about the patient's condition and progress to determine coverage, tell everyone involved in the patient's care about the decision and next steps, and create a discharge and continuing care plan early in the stay that they review as the stay goes on. Aetna says those reviews may happen by phone, by fax or on site at the facility.

Initial authorization answers only the first question

Around admission, the payer may review whether inpatient care is appropriate under the member's coverage and its medical-necessity criteria. Once the patient is admitted, the clinical picture changes: the patient may improve, deteriorate, need another procedure, need a higher level of care or become ready for discharge or post-acute care. Concurrent review addresses those changes.

Many payers make the link explicit. UnitedHealthcare's 2026 administrative guide says timely notification of admission lets it verify eligibility, authorize care including level of care, and initiate concurrent review and discharge planning. Admission notification deadlines are often short; Anthem's New York Medicaid manual, for example, requires network hospitals to notify it of emergent admissions within one business day. A hospital should not describe a whole stay as "authorized" because the admission was approved. The authorization record needs to show the approved period and any continuing review requirements.

Concurrent review happens while treatment is underway

Unlike prior authorization, concurrent review takes place while the patient is already receiving care, and its pace can be fast. In one UnitedHealthcare regional supplement, review is conducted by phone for each day of the stay. Another supplement in the same guide states that the continued stay for all inpatient admissions must be certified through the concurrent review process, using clinical information to certify and extend the stay, review the member's status, coordinate the discharge plan and determine medical necessity at the appropriate level of care.

Anthem's New York Medicaid manual, effective March 1, 2026, shows how granular it can get. Its utilization management clinicians review the hospital record on site or by phone to determine coverage for a continued stay, conduct continued-stay reviews daily unless the patient's condition is unlikely to change within the next 24 hours, and authorize the covered length of stay one day at a time. When the clinical information meets medical necessity criteria, approved days and bed-level coverage are communicated to the hospital. That is one plan's process, not a national rule, but it is a realistic picture of how many days of a stay are decided separately.

Continued-stay reviews need updated clinical information

The initial clinical packet explains why the patient needed admission. A continued-stay review asks a different question: why does the patient still need this level of care now? Relevant information can include the patient's current condition, treatment received and the response to it, abnormal findings, ongoing risks, planned procedures, barriers to discharge and the expected next level of care. The exact requirements depend on the payer and the case.

Evidence should be tied to the period under review. Sending "the chart" without linking documentation to the dates in question is a common failure. A continued-stay request should make it easy to see what happened during the days for which coverage is being requested, through current progress notes, vital-sign trends, test results, treatment response, medication changes, consultations, procedure plans and discharge barriers. More pages do not make a stronger review.

Authorized days need to be visible to both UM and billing

A frequent source of inpatient denials is the gap between utilization review and the final claim. A hospital may hold an authorization for the admission and several days, followed by further approvals that extend the stay. If those extensions live in a case management system and never reach billing, the claim can look as though it includes unauthorized days even though the hospital obtained continued-stay approval.

A structured inpatient authorization record should capture the initial authorization number, the approved admission date, the approved-through date, the level of care, each subsequent review date, extensions, denied periods and any change in level of care. Before or during denial follow-up, billing should be able to reconcile the claim's admission date, discharge date, inpatient or observation status and billed days directly against that history. If the payer denies only part of the stay, isolate that period rather than treating the whole admission as disputed.

Concurrent review is also discharge planning

Concurrent review is not only about whether another hospital day is covered. Aetna builds discharge and continuing-care planning into the process from early in the stay, and UnitedHealthcare's utilization review notices describe reviewers discussing treatment plans with the treating physician to facilitate access to care or alternate care settings.

That often triggers a second authorization workflow. The plan may approve the inpatient stay while separately requiring prior authorization for a skilled nursing facility, inpatient rehabilitation facility, long-term acute care hospital, home health, DME or other post-acute care. The discharge team needs to know not just when the patient can leave, but whether the next level of care has met the plan's administrative requirements.

A continued-stay denial is not the same as a denied admission

Suppose a payer agrees that the patient needed inpatient admission on Monday but decides acute inpatient care is no longer medically necessary from Thursday. That is a different dispute from saying the patient should never have been admitted. Preserve the approved period, the disputed period, the criteria the payer cited, the clinical record for the disputed days and any peer-to-peer or appeal rights. Collapsing the whole admission into "denied" makes both the clinical and financial dispute harder to work. If the denial is appealed, our guide to writing an insurance appeal letter covers the next step.

Medicare Advantage: the two-midnight benchmark applies

For Medicare Advantage, CMS's CY 2024 MA rule (CMS-4201-F), applicable to coverage beginning January 1, 2024, requires plans to follow Traditional Medicare's general coverage and benefit conditions, including the inpatient admission criteria in 42 CFR 412.3. Under that rule, an inpatient admission is generally appropriate for Part A payment when the admitting physician expects the patient to need hospital care that crosses two midnights. In the rule's preamble, CMS said MA plans must cover an inpatient admission when, based on complex medical factors documented in the record, the admitting physician expects care crossing two midnights.

Two caveats from the same preamble matter for hospitals. The "two-midnight presumption," which applies to Medicare's own medical review, does not apply to MA plans, and MA plans may still use prior authorization or concurrent case management review of inpatient admissions. The benchmark shapes what the plan must cover; it does not remove concurrent review.

Medicare Advantage: concurrent decisions became appealable in 2026

CMS's CY 2026 MA final rule (CMS-4208-F), finalized in April 2025 and applicable to coverage beginning January 1, 2026, changed how concurrent decisions are treated. The regulation now defines an organization determination to include a plan's refusal to provide or pay for services whether it is made pre-service, post-service or in connection with a decision made concurrently with the enrollee's receipt of services. CMS's fact sheet describes the point as ensuring those decisions are subject to MA notice and appeal requirements regardless of whether they are made before, after or during the services.

For hospitals, a concurrent adverse coverage decision in Medicare Advantage is therefore not just an internal utilization management note. It can carry formal notice and appeal rights. (On how often MA denials are overturned on appeal, see our analysis of Medicare Advantage denials.)

Medicare Advantage: approved admissions and approved days are protected

The same rule restricts plans from undoing approvals. Under 42 CFR 422.138(c), if an MA plan approved an item or service through prior authorization or a pre-service determination, or through a concurrent determination made during the enrollee's inpatient or outpatient care, it may not later deny coverage for lack of medical necessity and may not reopen the decision except for good cause or reliable evidence of fraud or similar fault. A related provision says that once a plan approves an inpatient admission under the two-midnight rules, additional clinical information obtained afterward cannot be used to establish good cause for reopening it. CMS's fact sheet sums up the effect: plans may reopen an approved admission only for obvious error or fraud, so that if a plan approves an inpatient admission, it has to honor that authorization.

That makes the authorization evidence for both the admission and each approved continued-stay period especially important. Preserve the plan's approval, the authorization number, the covered dates and level of care, the timestamp and the source of every decision. If a later claim adjudication looks inconsistent with an earlier approval, the hospital needs to be able to show exactly what the plan approved and when.

What the MA protections do not do

The 2026 rule protects decisions a plan has already made; it does not turn an approved admission into an open-ended authorization. Days the plan has not yet reviewed can still be subject to concurrent review of medical necessity and level of care. CMS's Part C reporting specifications reflect that ongoing review continues: they distinguish concurrent reviews during hospitalization that result in organization determinations from those that do not.

The practical line runs between two different questions. One is whether the plan can reverse a decision it already made, such as the admission or an approved block of days; generally, it cannot. The other is whether the plan can make a new determination about days or a level of care it has not yet approved; it can, subject to notice and appeal rights. Those questions can involve different parts of the same stay, which is why each decision needs its own record.

Track who owns the next action

Inpatient authorization involves admissions, utilization review, case management, physicians, payer medical directors, discharge planners, authorization staff and billing. Each open case should name the next action and its owner: updated clinical information due to the payer, a physician peer-to-peer, the next review date, a pending discharge authorization, a post-acute placement, or an appeal for denied days. Without that ownership, concurrent review becomes a string of payer calls rather than a controlled workflow, and the same prior authorization discipline that governs outpatient requests applies here, along with the handoffs between clinical and billing teams where inpatient authorization most often breaks down.

Concurrent review is a moving authorization record

The simplest way to understand concurrent review is that an inpatient authorization evolves while the patient is still in the bed. It starts with an admission decision, and as the clinical situation changes, payer reviewers assess the continued stay, level of care, discharge readiness and post-acute needs. Each consequential decision should be captured with its dates, source, rationale and next action. That is a far stronger revenue cycle record than a single field that says "auth approved," and under the 2026 Medicare Advantage rules, it is also the record that determines what the plan can and cannot revisit.

FAQ

What is concurrent review?

Concurrent review is utilization management performed while a patient is actively receiving care, most often during an inpatient stay. The payer reviews updated clinical information to decide on continued coverage, level of care and discharge planning.

Is concurrent review the same as prior authorization?

No. Prior authorization generally happens before the service or admission. Concurrent review happens while treatment is underway.

Does an approved inpatient admission cover the entire hospital stay?

Not necessarily. Many plans approve days in blocks or one day at a time and review the continued stay as it goes. Track the original approval, each extension and any denied periods separately.

Do Medicare Advantage plans have to follow the two-midnight rule?

Since 2024, MA plans must follow Traditional Medicare's inpatient admission criteria, including the two-midnight benchmark in 42 CFR 412.3. The two-midnight presumption that applies to Medicare's own review does not apply to MA plans, and they may still use concurrent review.

What changed for Medicare Advantage concurrent review in 2026?

Under CMS-4208-F, concurrent coverage decisions count as organization determinations with MA notice and appeal rights, and plans generally may not later deny or reopen approved admissions or approved concurrent determinations for lack of medical necessity, except for good cause or fraud.

Sources

All retrieved October 6, 2026.

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