Medication Adherence Data as Demand Package Evidence

James Wong — Founder & Pharmacist, LienScripts | March 29, 2026 | 7 min read

Pharmacy fill history adherence data is an underutilized form of objective evidence in PI demand packages. Consistent refill patterns prove ongoing injury and active treatment compliance, while gaps in adherence create vulnerabilities that attorneys must address proactively. Understanding how to read and present adherence data strengthens the damages narrative.

Medication adherence data — the pattern of prescription fills, refills, and gaps visible in the pharmacy dispensing record — is objective, timestamped evidence that proves a PI patient's ongoing injury and treatment compliance. A patient who fills gabapentin every 30 days for 14 consecutive months has created an unassailable record of persistent neuropathic pain that required continuous pharmacological management. This data is more persuasive than subjective pain reports because it documents behavior, not testimony.

• Medication adherence is measured by the medication possession ratio (MPR) — the percentage of days a patient has medication supply available based on fill dates and quantities dispensed
• Consistent adherence (MPR above 80%) demonstrates ongoing injury requiring continuous treatment, treatment compliance, and patient credibility
• Gaps in adherence create vulnerabilities that defense adjusters exploit to argue the injury resolved, the medication was unnecessary, or the patient is not credibly injured
• LienScripts generates a MERIT (Medication Evaluation & Rationale for Injury Treatment) report that presents adherence data chronologically, making fill patterns and gaps immediately visible
• Attorneys should review adherence data before finalizing demand packages and address any gaps with clinical explanations

What Adherence Data Shows

Every prescription fill in the pharmacy record carries a date, quantity, and days supply. From these three data points, the medication possession ratio (MPR) can be calculated:

MPR = (Total days supply dispensed) / (Total days in treatment period) x 100

An MPR of 100% means the patient had medication available every day of the treatment period. An MPR of 80% or above is considered adherent by clinical standards. An MPR below 80% indicates gaps — periods when the patient did not have medication available.

For PI attorneys, adherence data provides several forms of evidence:

Proof of Ongoing Injury

A patient who fills pain medication monthly for 12 months has created 12 independently documented clinical events — each fill required a valid prescription, confirming the treating physician continued to assess the patient as needing the medication. No one fills prescription pain medication monthly for a year without a genuine clinical need.

Treatment Compliance

Insurance adjusters and defense attorneys look for evidence that the plaintiff is not following medical advice — because non-compliance undermines the damages narrative. Consistent medication adherence is objective proof of compliance that cannot be disputed.

Credibility Enhancement

According to James Wong, PharmD, founder of LienScripts, "a plaintiff who testifies to severe ongoing pain is more credible when the pharmacy record shows they filled their pain medication every month without exception. The adherence data corroborates the testimony with objective evidence that the patient behaved consistently with their reported symptoms."

[!KEY] Medication adherence data transforms subjective pain testimony into objective behavioral evidence. A plaintiff who reports severe daily pain and has a 95% MPR across 18 months of analgesic therapy has corroborated their testimony with timestamped pharmacy data showing they consistently obtained and presumably consumed the prescribed treatment. This is powerful demand package evidence.

Reading Adherence Patterns

The MERIT report from LienScripts presents fill dates chronologically for each medication. Attorneys should look for these patterns:

Consistent Monthly Fills

Regular 28-30 day intervals between fills indicate stable treatment with continuous medication use. This is the strongest pattern for demonstrating ongoing injury.

Dose Escalation

Increasing doses over time (gabapentin 300mg TID escalating to 600mg TID, for example) document worsening symptoms or developing tolerance — both of which support the argument that the injury is not resolving.

Addition of New Medications

When the pharmacy record shows new medications added to the regimen over time (NSAID first, then muscle relaxant, then gabapentin, then CGRP monoclonal), each addition documents a clinical reassessment and treatment escalation.

Consistent Multi-Drug Adherence

A patient who fills four different medications consistently — anti-inflammatory, muscle relaxant, neuropathic agent, and sleep medication — demonstrates a complex injury requiring multi-modal pharmacological management. The adherence across all four drugs simultaneously is strong evidence of genuine, multifaceted injury.

[!TIP] When presenting adherence data in a demand package, create a simple timeline showing fill dates for each medication on parallel tracks. This visual format makes consistent adherence immediately apparent to the adjuster and demonstrates the treatment burden the patient endured throughout the case.

Addressing Adherence Gaps

Gaps in medication adherence are not necessarily fatal to the case, but they must be explained. Defense adjusters will exploit every gap to argue the injury resolved or the medication was unnecessary.

Common reasons for adherence gaps — and how to address them:

Insurance denial or prior authorization delay. The patient's health insurer denied the refill or required re-authorization. This gap actually supports the pharmacy lien narrative — it demonstrates the access barriers that lien coverage eliminates.

Financial barriers. The patient could not afford the co-pay. This documents financial hardship from the injury and supports the argument for pharmacy lien coverage.

Side effect management. The treating physician paused the medication to assess whether side effects were from the drug or from the underlying injury. The clinical note explaining the pause should be referenced in the demand narrative.

Treatment transition. The physician was transitioning the patient from one medication to another. A gap between the last fill of cyclobenzaprine and the first fill of tizanidine reflects clinical decision-making, not non-compliance.

Medication aversion. Some patients resist taking medication despite needing it. While this is not ideal for the damages narrative, it does not negate the injury — it reflects the patient's psychological response to being medicated for a condition they did not choose.

[!KEY] Every adherence gap should be addressed in the demand package with a clinical explanation. An unexplained two-month gap in gabapentin fills looks like the injury resolved. The same gap accompanied by a note that the insurer denied the refill and the patient went untreated for two months tells a completely different story — one of access barriers and unnecessary suffering.

Adherence Data vs. Medical Records

Medical records document what physicians observed and prescribed during office visits. Adherence data documents what the patient actually did between visits. These are complementary evidence streams:

• Medical records show the prescription decision — the physician determined the medication was clinically necessary
• Adherence data shows the patient behavior — the patient filled and used the medication as directed
• Together, they create a complete evidence chain: physician assessment of need + patient compliance with treatment

As Amar Lunagaria, PharmD, LienScripts' Chief Pharmacist explains, "the MERIT report bridges the gap between medical records and pharmacy records. We present the fill history alongside the clinical context so that the demand package reader understands not just what was prescribed but what was actually dispensed, when, and in what pattern."

Using Adherence Data in Settlement Negotiations

When presenting pharmacy lien balance in settlement negotiations, adherence data serves multiple strategic purposes:

1. Justifies the lien amount. Consistent adherence shows the patient needed every medication that was dispensed — the lien balance reflects genuine clinical need, not over-dispensing.

2. Rebuts the "resolved injury" argument. An adjuster who claims the injury resolved at 6 months must explain why the patient continued filling medications for 12 more months.

3. Supports future treatment claims. A patient with 18 months of consistent adherence who is still actively filling medications at the time of demand has documented an ongoing condition that requires future treatment — supporting claims for future medical expenses.

4. Demonstrates patient credibility. Consistent adherence corroborates pain testimony and undermines defense characterizations of the plaintiff as exaggerating or malingering.

[!TIP] Compare the adherence data timeline with the treatment milestone timeline (surgery dates, injection dates, physical therapy sessions). A patient whose medication adherence increases around surgical dates and gradually decreases during recovery periods has a clinically coherent pattern that reinforces the medical narrative. Present these timelines together in the demand package.

Related Resources

• Demand Package Pharmacy Records
• Maximize Settlement Medication Documentation
• Pharmacy Records Deposition Tips
• Audit-Proof Pharmacy Lien Documentation