Key Takeaways
- Insurance denials for addiction treatment are common but frequently overturned on appeal, with some studies showing reversal rates above 50 percent for substance abuse claims.
- The appeal process typically involves three stages: internal appeal with the insurer, external review through an independent reviewer, and regulatory complaints if needed.
- California law provides strong protections including Independent Medical Review through the DMHC, which issues binding decisions that insurers must follow.
- Documenting everything from the start, including all communications with your insurer and clinical records supporting medical necessity, is essential for a successful appeal.
- Treatment centers like Trust SoCal often assist with the appeal process, providing clinical documentation and advocating on your behalf with the insurer.
Why Insurance Denials for Rehab Happen
Receiving an insurance denial for addiction treatment is a frustrating and demoralizing experience, especially when you or a loved one is in crisis. However, denials are a common part of the insurance process, and understanding why they happen is the first step toward overturning them. Insurers deny rehab claims for several reasons, and many of these denials do not withstand scrutiny on appeal.
The most common reason for denial is a determination that the requested level of care is not medically necessary. This means the insurer believes that the same treatment outcomes could be achieved at a less intensive and less expensive level of care. For example, an insurer might deny residential treatment and suggest intensive outpatient treatment instead. These determinations are often based on limited clinical information or overly restrictive interpretations of clinical criteria.
Other common denial reasons include lack of pre-authorization, out-of-network provider issues, incomplete documentation, and benefit exclusions. Each of these denial types has specific strategies for appeal. The key is to read the denial letter carefully, understand the specific reason cited, and tailor your appeal to address that reason directly.
Federal law requires insurers to provide a written explanation for any coverage denial, including the specific clinical criteria used and your right to appeal. If you receive a verbal denial, request it in writing immediately.
Step 1: Review the Denial Letter Carefully
Your denial letter contains critical information that forms the foundation of your appeal. Read it carefully and identify the specific reason for the denial, the clinical criteria cited, the plan provisions referenced, and the deadline for filing an appeal. Most insurers allow 180 days for internal appeals, but acting quickly is important, especially if you need treatment urgently.
Pay particular attention to the clinical criteria the insurer used to make its determination. Under California SB 855, insurers must use recognized clinical criteria from nonprofit professional associations, such as ASAM criteria, when evaluating medical necessity for substance abuse treatment. If the denial letter references proprietary or non-standard criteria, this may be a basis for challenging the decision.
Make copies of the denial letter and all related correspondence. Create a file for your appeal that includes the denial letter, your plan documents, any clinical records submitted to the insurer, and notes from conversations with insurance representatives. Organization is essential for building a strong appeal.
Step 2: File an Internal Appeal
The internal appeal is the first formal step in challenging a denial. Most insurers have a specific appeals department that handles coverage disputes. Your denial letter should include instructions for filing an internal appeal, including where to send your appeal and what information to include.
Your appeal letter should clearly state that you are appealing the denial, reference the specific claim number and denial date, and explain why you disagree with the decision. Include supporting documentation from your treatment provider, such as clinical assessments, progress notes, and letters of medical necessity. A letter from a treating clinician explaining why the denied level of care is medically necessary is one of the most powerful components of an appeal.
Writing an Effective Appeal Letter
An effective appeal letter is clear, factual, and well-organized. Begin by identifying yourself and the claim being appealed. State the specific reason for the denial as described in the denial letter, then explain point by point why the denial is incorrect. Reference relevant clinical criteria, particularly ASAM guidelines, to demonstrate that the requested treatment meets the definition of medical necessity.
Include information about the consequences of inadequate treatment, such as previous failed attempts at lower levels of care, co-occurring medical or psychiatric conditions that require intensive monitoring, or a living environment that is not conducive to recovery. These clinical factors strengthen the case for the level of care you are requesting.
Requesting a Peer-to-Peer Review
Many insurers offer a peer-to-peer review option, where your treating physician or clinical director speaks directly with the insurer's medical director to discuss the case. Peer-to-peer reviews can be highly effective because they allow clinicians to present nuanced clinical information that may not be captured in written documentation.
Request a peer-to-peer review as soon as possible after receiving a denial. The treating clinician should be prepared to discuss the patient's history, current clinical presentation, failed attempts at lower levels of care, and the specific clinical rationale for the requested treatment. Trust SoCal's clinical team regularly conducts peer-to-peer reviews with insurers and has a strong track record of overturning denials through this process.
Step 3: External Review and Independent Medical Review
If your internal appeal is denied, you have the right to an external review by an independent third party. In California, this process is called Independent Medical Review and is administered by the Department of Managed Health Care for HMO plans and the California Department of Insurance for PPO plans. IMR decisions are binding on the insurer, meaning if the independent reviewer overturns the denial, the insurer must provide coverage.
To request an IMR through the DMHC, you can file online, by phone, or by mail. The DMHC assigns your case to an independent medical reviewer who is a licensed clinician with expertise in addiction medicine. The reviewer examines your clinical records, the insurer's rationale for denial, and applicable clinical criteria to determine whether the denied treatment is medically necessary.
IMR outcomes are favorable for consumers in a significant percentage of substance abuse cases. The independent review process removes the conflict of interest inherent in having the insurer make its own medical necessity determinations. If you believe your denial was unjust, pursuing IMR is a powerful and cost-free tool available to California residents.
File your Independent Medical Review request with the California DMHC at 1-888-466-2219 or online at dmhc.ca.gov. The process is free and typically results in a decision within 30 days, or sooner for urgent cases.
Expedited Appeals for Urgent Treatment Needs
When addiction treatment is urgently needed, waiting weeks for an appeal decision is not acceptable. Federal and California law require insurers to offer expedited appeal processes for urgent situations. An expedited appeal is appropriate when a delay in treatment could seriously jeopardize your life, health, or ability to regain maximum function.
Expedited internal appeals must be decided within 72 hours. If the expedited internal appeal is denied, you can request an expedited external review, which is typically decided within 72 hours as well. For California IMR cases involving imminent and serious threat to health, the DMHC can issue a decision within three days.
To trigger an expedited review, your treating clinician should document the urgent nature of the situation, including the medical and psychological risks of delaying treatment. Substance withdrawal risks, suicidal ideation, and unstable living conditions are examples of factors that support an expedited review request. Contact Trust SoCal at (949) 280-8360 if you need immediate assistance with an urgent appeal.
How Treatment Centers Help with Appeals
Reputable treatment centers in Orange County and throughout California have dedicated utilization review teams that specialize in working with insurance companies. These teams handle appeals as a routine part of their operations and have extensive experience crafting effective clinical arguments for medical necessity.
At Trust SoCal, our clinical and admissions teams work together to support patients through the appeal process. When a denial occurs, our clinical director prepares a detailed letter of medical necessity, our utilization review coordinator submits the appeal documentation, and our team conducts peer-to-peer reviews with insurer medical directors. We advocate aggressively for our patients because we know that access to appropriate treatment can be a matter of life and death.
If you are considering treatment and are worried about potential insurance denials, reaching out to a treatment center before you start can give you a significant advantage. Centers experienced with insurance processes can anticipate potential denial issues and prepare documentation proactively to reduce the likelihood of a denial occurring in the first place.

Madeline Villarreal, Counselor
Counselor




