Preparing Pharmacy Lien Evidence for UM/UIM Arbitration

Amar Lunagaria — Co-Founder & Chief Pharmacist, LienScripts | March 26, 2026 | 8 min read

UM/UIM arbitration demands a higher evidentiary standard for pharmacy costs than mediation or settlement negotiation. Proper evidence preparation — including MERIT documentation, pharmacy records authentication, and pharmacist declarations — is essential to protecting pharmacy lien recovery in arbitration proceedings.

Preparing Pharmacy Lien Evidence for UM/UIM Arbitration

Pharmacy lien evidence submitted in UM/UIM arbitration must meet formal evidentiary standards that exceed what is required in informal settlement negotiations. The arbitrator functions as both judge and jury, and pharmacy costs that are not properly authenticated, clinically justified, and causally linked to the accident will be reduced or excluded entirely. Preparing pharmacy evidence for arbitration requires a structured approach that treats every medication on the lien as a discrete evidentiary item requiring independent support.

  • UM/UIM arbitration applies evidentiary standards closer to trial than to mediation — pharmacy records must be authenticated and clinically supported
  • LienScripts generates a MERIT (Medication Evaluation & Rationale for Injury Treatment) report for every case, providing pharmacist-signed documentation for demand packages that meets arbitration evidentiary requirements
  • Pharmacy dispensing records should be authenticated through a custodian of records declaration from LienScripts or the dispensing pharmacy
  • As Amar Lunagaria, PharmD, LienScripts' Chief Pharmacist explains, each medication on the lien requires an independent causation chain linking the prescription to accident-related diagnoses
  • Defense counsel in UM/UIM arbitration routinely retains pharmacist experts to challenge lien pricing and medication necessity

Why UM/UIM Arbitration Is Different

In a typical third-party liability settlement, pharmacy lien costs are negotiated informally. The adjuster may challenge costs, but no evidentiary foundation is required — the parties negotiate based on positions and leverage.

UM/UIM arbitration changes the dynamic fundamentally. The arbitrator issues a binding award based on evidence presented. Pharmacy costs that lack evidentiary support — even if they are clinically legitimate — may be reduced or excluded from the award.

[!KEY] The most common arbitration error with pharmacy liens is submitting dispensing records without clinical context. An arbitrator who sees a list of medications and costs without understanding why each medication was prescribed, what injury it treats, and why the specific drug was selected over alternatives will default to the defense position on reasonableness.

Essential Evidence Components

1. Authenticated Dispensing Records

Pharmacy dispensing records must be authenticated through a custodian of records declaration. LienScripts provides authenticated records packages that include:

  • Complete dispensing history with dates, medications, quantities, and NDC numbers
  • Prescriber information for each prescription
  • Custodian of records declaration under penalty of perjury
  • Chain of custody documentation from prescription receipt through dispensing

2. MERIT Report as Expert Documentation

The MERIT report from LienScripts serves as the pharmacist-expert foundation for medication necessity and clinical justification. In arbitration, the MERIT report functions as a written expert opinion that:

  • Establishes medical necessity for each medication using pharmacological analysis
  • Links each prescription to specific accident-related diagnoses documented in treating physician records
  • Explains the mechanism of action and therapeutic rationale for each drug
  • Addresses why specific formulations (brand vs. generic, specific drug class) were clinically appropriate

3. Prescriber Declarations

For high-value medications or medications the defense is likely to challenge, obtain declarations from the prescribing physician. The declaration should confirm:

  • The prescription was issued for accident-related injuries
  • The specific medication was selected based on clinical assessment
  • Alternative medications were considered and rejected for stated clinical reasons
  • The medication remained necessary throughout the dispensing period

4. Causation Timeline

Create a chronological exhibit mapping each prescription to the corresponding medical event: accident date, ER visit, diagnostic imaging, specialist referral, diagnosis, prescription date. This timeline is the backbone of your causation argument.

Anticipating Defense Expert Challenges

Defense counsel in UM/UIM arbitration frequently retains pharmacist or physician experts to challenge pharmacy lien evidence. Common expert opinions include:

"Generic alternatives were available." Prepare a response for every brand-name medication on the lien. The MERIT report addresses this for each medication, but the arbitration brief should explicitly respond to the generic substitution argument with clinical rationale.

"The medication duration was excessive." Some medications — particularly opioids and muscle relaxants — draw duration challenges. Prepare treatment progression documentation showing that the prescribing physician adjusted the medication regimen over time based on clinical response.

"These medications were for pre-existing conditions." The causation timeline is your primary defense. Show that each challenged medication was either (a) newly prescribed after the accident for a newly diagnosed condition, or (b) an escalation of a pre-existing medication regimen directly attributable to accident-related aggravation.

[!TIP] Request your MERIT report from LienScripts with a specific note that it will be used in arbitration. LienScripts can tailor the clinical narratives to address the formal evidentiary requirements of arbitration proceedings, including more detailed pharmacological analysis and explicit causation language.

Structuring the Arbitration Brief

The pharmacy section of your arbitration brief should follow a structured format:

Introduction: Brief explanation of the pharmacy lien mechanism and the clinical basis for lien-based dispensing in this case.

Medication-by-medication analysis: For each medication or medication category, present:

  1. What the medication is and what it treats
  2. When it was prescribed and by whom
  3. What injury diagnosis it corresponds to
  4. Why this specific medication was selected
  5. The dispensing period and total cost
  6. MERIT report reference for clinical justification

Reasonableness of charges: Address pricing through the risk-adjusted dispensing framework — the pharmacy assumed non-payment risk, which is reflected in lien-based pricing, analogous to contingency fee arrangements.

Damages calculation: Present the total pharmacy lien balance as a component of the overall special damages, with the MERIT report and authenticated records as supporting exhibits.

Evidence Preparation Timeline

Effective arbitration preparation requires lead time:

  • 8 weeks before arbitration: Request MERIT report and authenticated records from LienScripts
  • 6 weeks before: Review MERIT report against medical records for consistency
  • 4 weeks before: Obtain prescriber declarations for high-value or likely-challenged medications
  • 3 weeks before: Create medication timeline and causation exhibits
  • 2 weeks before: Draft pharmacy section of arbitration brief
  • 1 week before: Prepare responses to anticipated defense expert opinions

[!KEY] Arbitration preparation for pharmacy liens should begin no later than eight weeks before the hearing date. Unlike mediation, where informal presentation is acceptable, arbitration requires formal evidentiary packages that take time to assemble, authenticate, and integrate into the overall damages presentation.

Frequently Asked Questions

Contact LienScripts to discuss arbitration evidence preparation for your pharmacy lien cases.

Related Resources

Frequently Asked Questions

Do pharmacy dispensing records need to be authenticated for arbitration?

Yes. Unlike informal settlement negotiations, UM/UIM arbitration requires authenticated evidence. Pharmacy dispensing records should be accompanied by a custodian of records declaration under penalty of perjury. LienScripts provides authenticated records packages for arbitration proceedings.

Can the MERIT report serve as expert testimony in arbitration?

The MERIT (Medication Evaluation & Rationale for Injury Treatment) report functions as a written pharmacist-expert opinion that establishes medical necessity, causation, and clinical rationale for each medication. It serves as the evidentiary foundation for pharmacy cost justification in arbitration proceedings.

How do I respond to a defense expert who challenges medication necessity?

Use the MERIT report's medication-by-medication clinical narratives as your primary response. For high-value medications, supplement with prescriber declarations confirming the clinical basis for the prescription. The causation timeline exhibit links each prescription to documented accident-related diagnoses.