Carelon prior authorization: how the approval process works

Carelon Medical Benefits Management, formerly AIM Specialty Health, reviews high-cost specialty services on behalf of Anthem and other Elevance Health Blue plans, and getting that delegation right is the difference between a clean approval and a request that never enters the queue. When a plan delegates imaging, cardiology, oncology, musculoskeletal, sleep, genetic testing, or rehabilitation review to Carelon, the request goes to Carelon, not to Anthem. Submitting it to the wrong entity stops the clock before a clinical reviewer ever sees it.

This guide is written for billers and authorization coordinators who process Carelon prior authorizations at volume.

What Carelon is

Carelon Medical Benefits Management, formerly AIM Specialty Health, is the specialty benefit manager Elevance Health uses to run pre-service clinical review for high-cost service lines on Anthem and other Elevance Blue plans. It is not a separate insurer: it performs the medical-necessity determination that the plan has delegated to it. The service categories most often delegated to Carelon are advanced imaging, cardiology, oncology, musculoskeletal procedures, sleep, genetic and molecular testing, and rehabilitation. Whether a given code requires authorization, and whether Carelon owns that review, differs by plan line, so confirm the requirement for that specific plan before building the request.

Carelon evaluates each request against published clinical appropriateness criteria that define exactly what documentation establishes medical necessity for the service. A request that addresses the applicable criteria directly moves faster than one that simply describes the procedure. Before approving, Carelon checks three things: whether the service meets medical-necessity criteria under the member’s specific plan, whether the clinical documentation supports the diagnosis and functional need, and whether the CPT and ICD-10 codes align with the submitted clinical rationale.

Which services

Routing is the single most consequential decision in a Carelon workflow, because a misrouted request does not bounce back with a redirect. It sits unprocessed at the wrong entity, and the authorization clock never starts. The most common error on Carelon-administered plans is sending a delegated specialty service to Anthem when Carelon owns the review. Confirm the destination before you build the request.

To confirm which entity manages a specific service, check the member’s ID card and plan documents; the card identifies the utilization management vendor for specialty services. If the card or plan references Carelon (or its former name, AIM Specialty Health) for the service category, the authorization routes to Carelon Medical Benefits Management through the Carelon ProviderPortal, not to Anthem. For Medicare Advantage and Medicaid lines, authorization requirements, timelines, and appeal rights differ from commercial plans, so verify with the member’s specific plan documents before assuming commercial rules apply.

Working prior authorization across more than one payer? Start with Silna’s complete guide to prior authorization.

How to submit

The Carelon ProviderPortal is the primary electronic submission channel for delegated specialty review, and it supports status tracking that reduces follow-up calls. Gather every required element before opening the request, because missing any one field triggers an automatic pend and the review clock does not start until the request is administratively complete:

• Member plan ID and date of birth, entered exactly as printed
• Treating and ordering provider NPI
• CPT / HCPCS code(s) for the requested service
• ICD-10 diagnosis code(s) establishing medical necessity
• Complete supporting clinical documentation: office notes, treatment history, relevant diagnostic results, functional impairment documentation, and the plan of care

To request an expedited determination, document the clinical rationale for urgency in the submission and select the expedited option in the Carelon ProviderPortal. For urgent cases when portal access is unavailable, phone submission to Carelon’s provider services line is the fastest alternative; current numbers are published on the Carelon provider portal and on member ID cards, so do not rely on numbers from older reference materials. Completing benefits verification before opening the request prevents the most common pend triggers, confirming active coverage, correct routing, and benefit category before submission.

*Decision windows reflect regulatory requirements under the CMS Interoperability and Prior Authorization Final Rule for Medicare Advantage, Medicaid managed care, and CHIP plans. Commercial plan timelines are governed by state law and plan terms; verify the applicable window in the member’s plan documents.

How to appeal a denial

Before filing any appeal, categorize the denial. Administrative denials (missing information, wrong-entity submission, or failure to obtain authorization before service delivery) are reversible without spending appeal rights: correct the submission and resubmit. Resubmission, however, does not constitute an appeal and does not preserve appeal rights. Reserve the formal appeal process for clinical denials, where Carelon’s reviewer determined medical necessity was not established.

The general sequence for a clinical denial:

1. Request a peer-to-peer review. The treating clinician contacts Carelon directly and speaks with a Carelon medical director to present the clinical rationale, referencing the denial letter and acting within the window it specifies. This is a real-time clinical conversation, not a document submission, it does not require a formal written appeal first, and it does not consume formal appeal rights. It is the highest-leverage intervention for clinical denials.

2. File the first-level internal appeal. Submit in writing with the original denial letter, updated clinical notes, the specific Carelon clinical criteria the request now meets, and any peer-reviewed literature supporting medical necessity. For behavioral or functional-need denials, supply functional impairment documentation and measurable treatment goals if the original submission lacked them; this is the documentation gap Carelon most frequently cites.

3. Exhaust the second internal level if the plan offers one. The denial notice states whether a second internal review exists for that plan and line of business. Complete it before requesting external review.

4. Request external review. Once internal appeals are exhausted, providers may request review by an external independent review organization not affiliated with Carelon or Elevance Health. Federal and state law govern this right depending on the line of business; external review overturns a meaningful share of sustained denials, particularly when the clinical record was strengthened during the internal appeal.

How Silna reduces denials

Most avoidable Carelon denials trace to two preventable causes: incomplete clinical documentation and submitting a delegated service to the wrong entity. Both are detectable before the request leaves the practice. The most common documentation failure is a diagnosis code mismatch, where the ICD-10 on the authorization form does not match the ICD-10 in the clinical note, which Carelon treats as incomplete and which pends the request and resets the clock.

Silna Health’s Care Readiness Platform automates the workflow end to end: benefits verification, form population, real-time error checking, and submission through Carelon’s delegated channel. Silna’s Predictive Document Intelligence flags documentation gaps and routing errors before submission, addressing the administrative failures that reset timelines and burn appeal rights. By combining automation with built-in payor communication, Silna cuts pre-visit administrative work by 95%, per Silna Health, 2026.

Silna’s strongest adoption is among ABA therapy, physical therapy, and mental health practices, plus care management for older adults, the practice types where specialty prior authorization volume is highest and where functional impairment documentation matters most. For teams managing Carelon across commercial, Medicare Advantage, and Medicaid lines, Silna coordinates the full workflow so the first submission is the complete submission. See how it applies to your payer mix at silnahealth.com.

Key terms

Carelon Medical Benefits Management

Elevance Health’s specialty benefit manager, formerly AIM Specialty Health; performs delegated clinical review for high-cost specialty services on Anthem and Elevance Blue plans.

Delegation

When a plan assigns the prior authorization review of a service line to Carelon rather than processing it through standard Anthem review; submit and appeal where review is delegated.

Carelon ProviderPortal

Carelon’s provider-facing portal for submitting, tracking, and appealing delegated specialty prior authorizations.

Clinical appropriateness criteria

Carelon’s published medical-necessity standards by service category; the standard a submission is judged against.

Pend

A request held for missing information or fields; the review clock pauses until the request is administratively complete, resetting the timeline.

Peer-to-peer review

A real-time call between the treating clinician and a Carelon medical director to overturn a denial; time-limited from the denial date.

Frequently Asked Questions

This article is general educational information, not medical or insurance advice. Coverage rules and clinical criteria vary by plan and state, so consult a licensed healthcare professional or your plan administrator about your specific situation.

About the author

Jeffrey Morelli

Jeffrey Morelli is the Co-Founder and CEO of Silna Health, the first Care Readiness Platform built to remove the administrative barriers that delay care. Silna automates benefit checks, eligibility, and prior authorizations across 1,000+ payors, and is backed by $27M from Accel and Bain Capital Ventures. Before Silna, Jeff spent a decade in San Francisco building and scaling products for highly regulated industries, including leading go-to-market at Truework (Series C, acquired by Checkr).

Last reviewed: June 25, 2026.