Insurance Formulary Tier Placement Proves Clinical Necessity in PI Cases

Amar Lunagaria — Co-Founder & Chief Pharmacist, LienScripts | March 4, 2026 | 8 min read

When a medication is placed on a higher formulary tier or requires prior authorization, the insurance company's own clinical review process validates the drug's necessity for the patient. Learn how formulary tier evidence strengthens PI cases.

Insurance formulary tier placement is a clinical classification system developed by pharmacy benefit managers (PBMs) and insurance companies that categorizes medications based on clinical necessity, therapeutic alternatives, and treatment appropriateness. When a plaintiff's medication requires prior authorization or sits on a higher formulary tier, the insurance company's own clinical review process has validated that the medication is medically necessary for that specific patient -- creating evidence from the defense's own insurance ecosystem that the treatment is appropriate and required.

• Insurance formulary tiers classify medications by clinical necessity and availability of alternatives, with higher tiers requiring greater clinical justification
• Prior authorization approval means the insurance company's own clinical reviewers determined the medication is medically necessary for the specific patient
• LienScripts navigates formulary requirements for every medication, and each case receives a MERIT (Medication Evaluation & Rationale for Injury Treatment) report that documents formulary tier placement and any approval processes completed
• Step therapy requirements that lead to higher-tier medications document that the patient tried and failed lower-tier alternatives -- objective evidence of treatment complexity
• The insurance company cannot credibly argue a medication is unnecessary when their own clinical review process approved it as medically necessary

How Formulary Tiers Work

Most insurance formularies use a four-to-six tier structure:

• Tier 1 (Generic) -- lowest cost, widely available generics; minimal clinical review required
• Tier 2 (Preferred Brand) -- brand-name medications the PBM has negotiated favorable pricing for; routine coverage
• Tier 3 (Non-Preferred Brand) -- brand-name medications not on the preferred list; may require prior authorization
• Tier 4 (Specialty) -- high-complexity medications requiring specialized handling, monitoring, or administration; prior authorization almost always required
• Tier 5/6 (Specialty + Limitations) -- the most restricted medications requiring extensive clinical justification

Each tier represents an increasing level of clinical scrutiny. Medications on higher tiers are there not because they are less effective but because the PBM requires documented clinical justification before approving coverage.

As Amar Lunagaria, PharmD, LienScripts' Chief Pharmacist explains, "When an insurance company places a medication on Tier 4 and requires prior authorization, they are saying this medication has legitimate clinical uses but they want to confirm it is being used appropriately for this specific patient. When they approve the prior authorization, they have confirmed exactly that. The plaintiff now has the insurance company's own clinical review validating that this medication is medically necessary. Defense counsel is in the uncomfortable position of arguing against their own industry's clinical determination."

Prior Authorization as Clinical Validation

Prior authorization (PA) is the process by which the prescriber submits clinical documentation to the insurance company justifying the medication. The PA process requires:

1. Clinical diagnosis -- the prescriber must specify the condition being treated
2. Treatment history -- documentation of previous medications tried and failed
3. Clinical rationale -- explanation of why this specific medication is needed
4. Expected duration -- the anticipated length of treatment

When the insurance company approves the PA, they have reviewed this clinical documentation and determined that the medication meets their criteria for medical necessity. This approval creates a third-party clinical validation document that is independent of both the plaintiff and the treating prescriber.

Step Therapy Documentation

Many formularies implement step therapy (also called "fail first") protocols that require patients to try and fail lower-tier medications before the insurer will cover a higher-tier alternative. The step therapy pathway creates a documented treatment failure history:

• Step 1: Patient tried generic NSAID (Tier 1) -- inadequate pain control documented
• Step 2: Patient tried preferred brand NSAID (Tier 2) -- still inadequate or adverse effects documented
• Step 3: Patient prescribed non-preferred or specialty medication (Tier 3-4) -- prior authorization approved based on documented failures at Steps 1 and 2

Each step failure is documented in both the pharmacy record and the insurance authorization record, creating a dual-sourced evidence trail of treatment complexity.

Formulary Tier as Treatment Complexity Evidence

Higher formulary tier placement correlates with treatment complexity in ways that strengthen PI cases:

Tier 1-2 Medications Only

Cases managed entirely with Tier 1-2 medications suggest straightforward conditions treatable with standard, first-line therapies. These cases exist but represent the simplest clinical scenarios.

Tier 3-4 Medications Required

When a patient requires Tier 3 or Tier 4 medications, it documents that standard therapies were insufficient. The insurance company's own tier structure validates that the patient's condition is more complex than what first-line treatments can manage.

Specialty Tier Medications

Specialty tier medications (Tier 4-6) document the highest level of treatment complexity. These medications often require specialized pharmacy handling, clinical monitoring, and extensive prior authorization -- all of which generate documentation that supports injury severity claims.

Using Formulary Evidence in Demand Packages

When incorporating formulary tier evidence into demand packages:

1. Identify the formulary tier for each medication in the plaintiff's regimen
2. Document any prior authorizations -- include approval letters showing the insurance company's clinical validation
3. Map step therapy pathways -- show which medications were tried and failed before the current regimen was approved
4. Highlight tier escalation -- if the patient moved from Tier 1 to Tier 3 or 4 medications over time, this documents progressive treatment complexity
5. Note specialty pharmacy routing -- medications requiring specialty pharmacy dispensing document the highest level of treatment complexity

LienScripts generates a MERIT (Medication Evaluation & Rationale for Injury Treatment) report for every case, providing pharmacist-signed documentation for demand packages that includes formulary tier analysis and prior authorization documentation.

Countering Defense Arguments

"A cheaper alternative would work."

If the insurance company approved a higher-tier medication after reviewing the prescriber's clinical documentation (including failed trials of cheaper alternatives), the insurance company has already determined that the cheaper alternative did not work. The defense is arguing against the insurance company's own clinical reviewers.

"This medication is not medically necessary."

The prior authorization approval letter is the insurance company's written determination that the medication is medically necessary for this specific patient. This is particularly powerful because insurance companies have strong financial incentives to deny unnecessary medications -- their approval means the clinical case was compelling enough to overcome that financial motivation.

"The prescriber chose the most expensive option."

Step therapy protocols ensure the prescriber did not choose the most expensive option first. The documented pathway shows the patient progressed through less expensive alternatives that failed before reaching the current medication. The insurance company's formulary system enforced this progression.

Practical Takeaways

Insurance formulary tier placement and prior authorization approvals are underutilized evidence in personal injury cases. They represent clinical determinations made by the insurance industry's own reviewers -- third-party validators with financial incentives to deny coverage -- confirming that each medication is medically necessary for the specific patient. Attorneys who present formulary evidence transform the insurance company's own clinical review process into powerful support for their client's treatment claims.

Related Resources

• Prior Authorization Denials as Severity Evidence -- How PA denials document treatment barriers
• Step Therapy Fail-First as Treatment Failure Evidence -- Documenting medication failures through step therapy
• Insurance Denial Medication Access -- Navigating coverage barriers in PI cases