Case Study: Elderly Pedestrian Struck in Parking Lot — Hip Fracture, Colles' Fracture, Medicare Gaps, and a Targeted Pharmacy Lien

James Wong — Founder & Pharmacist, LienScripts | February 17, 2026 | 8 min read

A 68-year-old woman on Medicare is struck by a backing vehicle in a mall parking lot, sustaining a femoral neck fracture requiring partial hip replacement and a Colles' wrist fracture. With warfarin on board, osteoporosis newly diagnosed, and Part D coverage leaving gaps, a carefully scoped pharmacy lien provides documented access to the medications Medicare won't cover.

Case Background

Fictional Disclaimer: The patient, medical history, insurance details, and case events described below are composite and fictional. They are designed to illustrate how pharmacy lien programs navigate Medicare coordination, drug interaction constraints, and pre-existing condition challenges. No real patient data was used.

Dorothy, a 68-year-old retired bookkeeper, was walking from her car to the mall entrance when a vehicle reversed out of a parking space and struck her at low speed. She was knocked down and landed on her left hip and right wrist simultaneously — a classic bilateral fall pattern. Despite the vehicle's low speed, the impact was sufficient to cause a femoral neck fracture on the left and a Colles' fracture (distal radius) on the right.

At her age and with her bone density profile — a DEXA scan taken at the hospital revealed moderate osteoporosis — these were not minor injuries. The femoral neck fracture required a partial hip replacement (hemiarthroplasty). The Colles' fracture required closed reduction and casting, with follow-up over six weeks.

Dorothy had Medicare Parts A and B, along with a Part D prescription drug plan. She did not have a Medigap supplement. She was also on warfarin for longstanding atrial fibrillation, a drug that creates significant constraints on pain management options following orthopedic trauma.

The defendant was an unrelated driver who had a standard personal auto insurance policy. Liability was relatively clear — multiple security cameras captured the incident from two angles. The insurer accepted liability early. The dispute shifted quickly to damages, where the defense would lean hard on osteoporosis as a pre-existing condition to argue the fractures would have occurred even in a lower-energy fall.

The Medicare Coordination Challenge

Medicare Part D is the prescription drug benefit. It covers most standard medications, but it has coverage gaps, formulary restrictions, and cost-sharing structures that can leave patients with meaningful out-of-pocket exposure even when coverage is "active." More importantly, when a patient is injured in a third-party liability case, Medicare has secondary payer status — meaning the liability insurer is the primary payer. Medicare may pay conditionally but will seek reimbursement (its lien or conditional payment) at settlement.

[!KEY] When Medicare is the patient's insurer and a third-party liability claim is pending, the pharmacy lien should be carefully scoped to medications that fall outside Medicare Part D coverage or are denied by the plan — not to medications that Part D is paying. Properly scoping the lien protects both the patient and the attorney from double-payment complications at settlement.

Dorothy's pharmacy lien was scoped to three categories of medications that Part D would not cover or had denied:

1. Compounded topical pain preparations — Part D does not cover compounded medications
2. Bisphosphonate therapy newly initiated post-fracture — Specifically, the initiation of alendronate (Fosamax) as a direct clinical response to the fracture, which her plan covered only with a prior authorization that was pending at the time care began
3. Trazodone for sleep — Her plan required step therapy documentation before approving it, creating a practical gap during the acute phase

All three were filled under the pharmacy lien. The MERIT was particularly important here to document that the bisphosphonate initiation was directly precipitated by the fall-induced fracture and the newly discovered osteoporosis diagnosis — not a continuation of a pre-existing treatment plan.

The Warfarin Problem: Pain Management Under Constraint

Warfarin is an anticoagulant that creates real medication management challenges in orthopedic trauma. The constraints:

• NSAIDs are contraindicated (ibuprofen, naproxen, diclofenac systemic) due to drug-drug interaction with warfarin and elevated bleeding risk
• COX-2 inhibitors (celecoxib) require careful consideration — less platelet effect than traditional NSAIDs, but still carries some interaction risk; used at physician discretion with INR monitoring
• Opioids increase fall risk — clinically appropriate post-operative, but the prescriber managed the taper aggressively given the mobility goals
• Aspirin combinations similarly problematic with warfarin

[!KEY] Patients on warfarin who sustain orthopedic injuries have a narrowed pain medication window that requires deliberate prescriber attention. The pharmacy lien record should reflect the clinical reasoning — not just the prescriptions filled — so that the defense cannot misconstrue an unusual medication choice as evidence of an unrelated problem.

Dorothy's post-hemiarthroplasty pain regimen included:

• Oxycodone/acetaminophen for the first two weeks post-surgery (short bridge, INR monitored closely)
• Gabapentin 100 mg TID — at low dose given her age and fall risk, but appropriate for nerve pain around the hip surgical site
• Trazodone 50 mg QHS for sleep (filled under lien during the step-therapy gap)
• Compounded topical diclofenac gel for the wrist cast area — topical NSAIDs have significantly lower systemic absorption and were used cautiously at prescriber direction

[!SOURCE] Topical diclofenac has substantially lower plasma concentrations than oral diclofenac, reducing systemic drug-drug interaction risk with warfarin. See: Roth SH, Shainhouse JZ, "Efficacy and safety of a topical diclofenac solution (Pennsaid) in the treatment of primary osteoarthritis of the knee," Archives of Internal Medicine, 2004; and FDA labeling for Voltaren Gel (diclofenac sodium topical gel 1%).

The Pre-Existing Condition Defense

The defense hired an orthopedic biomechanics expert to argue that Dorothy's osteoporosis — not the vehicle impact — was the proximate cause of both fractures. The argument: a person with normal bone density would not have fractured from a low-speed parking lot strike.

This is a well-worn defense argument in elderly fracture cases. California law's eggshell plaintiff doctrine provides the standard response: the defendant takes the plaintiff as she is. If the defendant's negligence caused the injury event, the pre-existing osteoporosis does not limit the recovery — it explains the severity, but not the liability.

The MERIT was critical here for a different reason than injury-date documentation. Dorothy's prior Part D fill history — not part of the lien, but available as a medical record — showed no prior fills for hip pain medications, no prior opioids, and no falls-related prescriptions. The bisphosphonate was new. The gabapentin was new. The sleep aid was new. The medication record told the story of a woman who had been mobile, independent, and unmedicated for pain before the parking lot strike changed everything.

The insurer's adjuster conceded on the eggshell plaintiff issue at mediation. The case settled.

Scoping the Lien Correctly Matters

One of the risk areas in Medicare cases is inadvertently including in the pharmacy lien medications that Medicare was already paying for. If that happens, the patient's settlement may face a conditional payment demand from Medicare for the full amount it paid — and the lien holder's claim may overlap. The result is an overpayment situation that can be difficult to unwind at settlement.

The pharmacy lien team coordinated with the attorney's Medicare secondary payer compliance process to ensure no overlap. The three medication categories on the lien were confirmed as non-covered or denied by Part D. The MERIT was annotated accordingly.

This kind of coordination takes extra time at intake but avoids significant complications at resolution. In cases involving Medicare, the extra diligence is not optional — it is the minimum standard of care.

Related Resources

• What Is a Pharmacy Lien?
• Medi-Cal Lien and Pharmacy Lien in California
• What Is a Medicare Set-Aside in Personal Injury?
• Health Insurance Subrogation vs. Pharmacy Lien
• Slip and Fall Injury Medications