Reconciling Medications

Performs structured medication reconciliation across care transitions by comparing medication lists from multiple settings, flagging discrepancies, and producing an actionable reconciliation report suitable for pharmacist or provider review.

Why This Skill Exists

Medication errors injure over 1.3 million Americans annually and kill approximately 7,000. The single highest-risk moment is a care transition — admission, transfer, or discharge — where medication lists from different sources must be merged into one accurate, current regimen.

The Joint Commission recognizes this risk as National Patient Safety Goal NPSG.03.06.01, requiring organizations to "maintain and communicate an accurate patient medication list." Despite this mandate, studies consistently show that 30–70 % of patients have at least one unintended medication discrepancy at admission or discharge.

This skill exists to systematically surface those discrepancies before they reach the patient. It enforces the Best Possible Medication History (BPMH) methodology: a structured interview and multi-source verification process that goes beyond simply copying a list from the chart.

When to invoke this skill:

• Admission med-rec (ED → inpatient)
• Transfer med-rec (ICU → floor, facility → facility)
• Discharge med-rec (inpatient → home/SNF/rehab)
• Post-discharge follow-up or clinic visit reconciliation
• Retrospective chart review for quality or litigation support

Checkpoint A: Pre-Draft Intake (Mandatory)

Before generating any output, confirm or obtain every item below. If a source is unavailable, document it as [NOT PROVIDED] — never silently skip it.

A1. Transition Context

A2. Medication Lists Available

Collect all lists that exist. Each list becomes a column in the reconciliation matrix. Common sources:

1. Home medication list — patient-reported or pharmacy-verified
2. Admission orders — first orders entered on arrival
3. Inpatient medication administration record (MAR) — what was actually given
4. Discharge prescription list — what the patient leaves with
5. External pharmacy records — retail/mail-order fill history
6. Prior facility transfer summary — if transferring between facilities

BPMH note: The home list should ideally be built from ≥ 2 sources (patient interview + pharmacy records or pill bottles). A single-source list must be flagged as [UNVERIFIED — SINGLE SOURCE].

A3. Patient Context

Workflow

Step 1 — Normalize Each List

For every medication on every source list, extract and standardize:

Include OTC medications, herbals, vitamins, and supplements. These are the most commonly omitted categories and frequently cause interactions (e.g., St. John's Wort + SSRIs, fish oil + anticoagulants).

Step 2 — Build the Reconciliation Matrix

Create a row per unique medication (match by generic name + route). Columns represent each source list. Mark the status in each cell:

Step 3 — Flag Discrepancies

Every row that is not CONTINUED is a discrepancy requiring attention. Prioritize by severity:

Critical (resolve before patient leaves the current setting):

• Omission of a high-alert medication (see ISMP list below)
• Duplicate anticoagulant, insulin, or opioid
• Drug-drug interaction rated as "major" or "contraindicated"
• Allergy mismatch — medication on list conflicts with documented allergy
• Category X drug in pregnancy

High (resolve within the same shift):

• Unintentional dose change on a narrow therapeutic index drug
• Renal/hepatic dose adjustment needed but not made
• Omission of chronic disease maintenance medication (e.g., anticonvulsant, immunosuppressant)

Moderate (resolve before next transition):

• Therapeutic duplicate with no documented rationale
• OTC/supplement omission with interaction potential
• Frequency discrepancy (e.g., BID vs TID)

Low (document for follow-up):

• Brand/generic discrepancy with no clinical impact
• Cosmetic sig differences (e.g., "daily" vs "once daily")

Step 4 — High-Alert Medication Cross-Check

Per the ISMP List of High-Alert Medications in Acute Care Settings, give extra scrutiny to:

If any high-alert medication has a discrepancy of any severity, escalate the finding to the top of the report regardless of the general severity tier.

Step 5 — Allergy & Interaction Screen

• Cross-reference every medication on the reconciled list against the patient's allergy and intolerance record.
• Flag cross-sensitivities (e.g., penicillin allergy → cephalosporin caution).
• Run a drug-drug interaction check across the final reconciled list. Report interactions at the "major" or "contraindicated" level. Note "moderate" interactions only if clinically relevant given patient context.

Step 6 — Renal & Hepatic Dose Review

If renal or hepatic function data is available:

• Flag every renally-cleared medication where the dose has not been adjusted for the patient's CrCl/eGFR.
• Flag hepatically-metabolized medications where Child-Pugh or MELD suggests dose reduction.
• If lab values are [NOT PROVIDED], append a blanket caveat: ⚠ Renal/hepatic function not available — dose appropriateness not verified.

Output Structure

The final reconciliation report must contain these sections in order. See references/RECONCILIATION-TEMPLATE.md for formatted table templates.

1. Header — Patient identifier, transition type, date, facilities, providers
2. Summary Dashboard — Total meds reconciled, counts by status code, critical/high/moderate/low discrepancy counts
3. Reconciliation Matrix — Full table, sorted by discrepancy severity (critical first), then alphabetically
4. High-Alert Medication Detail — Dedicated section for any high-alert med with a non-CONTINUED status
5. Allergy & Interaction Findings — Allergy mismatches and major DDIs
6. Renal/Hepatic Flags — Dose adjustment concerns
7. Unresolved Items — Anything marked [VERIFY] or [NOT PROVIDED]
8. Pharmacist Attestation Block — Name, credentials, date, signature line

Checkpoint B: Post-Draft Alignment (Mandatory)

Before finalizing, verify every item:

• Every medication from every source list appears in the matrix (no silent drops)
• Every non-CONTINUED row has a severity rating
• High-alert medications are called out in their dedicated section
• Allergy list has been cross-checked against the final reconciled list
• OTC meds, herbals, and supplements are included
• Renal/hepatic caveat is present if labs were unavailable
• All [VERIFY] and [NOT PROVIDED] tags are collected in Unresolved Items
• Transition context (sending/receiving facility, providers) is complete
• Output follows the template structure in references/RECONCILIATION-TEMPLATE.md
• No medication was assumed to be intentionally discontinued without documentation

Quality Audit

Reference Files

• references/RECONCILIATION-TEMPLATE.md — Output table templates for the reconciliation matrix, summary dashboard, high-alert detail section, and attestation block.

External References (do not fetch — for human context only)

• Joint Commission NPSG.03.06.01 — Medication Reconciliation
• ISMP List of High-Alert Medications in Acute Care Settings (updated annually)
• WHO High 5s Project — Standard Operating Protocol for Medication Reconciliation
• ASHP Guidelines on Pharmacy-Directed Medication Reconciliation

Guidelines

• Never assume a medication was intentionally discontinued without explicit documentation from the prescribing provider. Unexplained absences from a medication list must be flagged as [OMITTED — UNINTENTIONAL?] until resolved.
• The Best Possible Medication History (BPMH) must be sourced from at least two independent sources (e.g., patient interview plus pharmacy fill records). A single-source medication history must always be flagged as [UNVERIFIED — SINGLE SOURCE].
• High-alert medications per the ISMP list require individual line-by-line reconciliation at every care transition — they must never be batch-processed or assumed continued without verification.
• All OTC medications, herbal supplements, and vitamins must be explicitly included in the reconciliation matrix. Their omission is the most common source of undetected drug-drug interactions at care transitions.
• When renal or hepatic function data is unavailable, append a blanket caveat to the reconciliation report rather than assuming doses are appropriate. Never silently pass a renally-cleared medication without organ function verification.
• Every discrepancy must be assigned a severity tier (Critical, High, Moderate, Low) before the reconciliation report is finalized. Untiered discrepancies are considered incomplete reconciliation.
• Reconciliation reports are draft documents until attested by a licensed pharmacist or credentialed provider. AI-generated output must never be transmitted to a receiving facility without human review and signature.
• For cross-facility transfers, confirm formulary compatibility between sending and receiving institutions before finalizing therapeutic substitutions to prevent gaps in medication availability at the receiving site.