Medication Reconciliation: The Five-Step Process and What the Evidence Shows

Medication reconciliation is the process of comparing a patient’s complete, actual medication regimen against the medications being ordered at a transition in care — admission, transfer between units or levels of care, and discharge — to identify and resolve discrepancies before they reach the patient. It exists because most medication changes at a transition are unintentional: a clinician may not have easy access to the patient’s true pre-admission list, or may be unaware of a recent change made elsewhere, and the result can be an omitted medication, an unintended duplicate therapy, or an incorrect dose carried forward into the next setting of care.

Page checked against AHRQ Patient Safety Network’s Medication Reconciliation primer (UC Davis PSNet Editorial Team, last reviewed December 2024) in August 2026. The Joint Commission’s own accreditation-manual language for its medication-related National Patient Safety Goal could not be directly verified for this page — jointcommission.org blocks automated retrieval and no archived snapshot was available — so the NPSG framing below is described at the level AHRQ’s independently reviewed primer confirms, and should be checked against your program’s current Joint Commission manual before being treated as a compliance citation.

The Core Procedure: Five Steps, Applied at Every Transition

Medication reconciliation is commonly implemented as a five-step comparison process, applied fresh at each transition point rather than performed once and assumed to carry forward:

1. Develop a current, complete list of the patient’s actual medications — the “best possible medication history,” gathered from the patient or caregiver, prior records, community pharmacy fill data, and other available sources, including name, dose, route, frequency, and indication for each medication, and covering prescription, over-the-counter, and herbal/supplement products.
2. Develop a list of the medications about to be prescribed in the new setting — the admission orders, the transfer orders, or the discharge prescriptions.
3. Compare the two lists against each other, looking specifically for omissions, duplications, dosing discrepancies, and interactions introduced by the change in setting.
4. Make and document clinical decisions based on that comparison — continue, discontinue, or modify each medication, with the reasoning captured in the record rather than left implicit.
5. Communicate the resulting, updated list to the patient, family or caregiver, and to the next clinicians and setting of care, so the reconciled list — not the pre-transition list — becomes the working reference going forward.

This sequence is widely taught as the operational backbone of medication reconciliation programs; the judgment work in practice is almost entirely in steps 1 and 3 — building a genuinely complete and accurate “current medications” list, and catching a discrepancy that looks clinically plausible rather than obviously wrong.

Why the “Current Medications” List Is the Hard Part

According to AHRQ’s Patient Safety Network primer, hospital-based clinicians often cannot easily access a patient’s complete pre-admission medication list, or may be unaware of medication changes made recently by another prescriber. This is precisely why step 1 — building the best possible medication history — is where reconciliation programs most often fail in practice, not step 4 (the clinical decision itself, once a discrepancy is actually identified, is usually the easier part). AHRQ notes that patients taking high-risk medications such as insulin or anticoagulants, and populations such as children, older adults, and patients with polypharmacy, are at higher risk for medication errors and adverse drug events at transitions, which makes them the natural priority group when reconciliation resources are limited.

What the Evidence Actually Shows

It is worth stating plainly, because it cuts against the intuitive assumption: AHRQ’s PSNet primer describes the evidence for medication reconciliation’s effect on patient outcomes as mixed, and notes that the most effective and generalizable implementation strategies remain unclear. Specifically:

• A 2016 systematic review found that pharmacist-led reconciliation processes could prevent medication discrepancies and potential adverse drug events (ADEs) at admission, at in-hospital transitions (e.g., ICU transfer), and at discharge.
• A 2013 systematic review conducted as part of AHRQ’s Making Health Care Safer II report similarly found that pharmacist engagement in reconciliation prevented discrepancies and potential ADEs after discharge.
• However, the actual clinical effect of post-discharge medication discrepancies appears to be small, and medication reconciliation alone does not reduce hospital readmissions or other adverse events after discharge — reconciliation reduces discrepancies, which is a necessary but not sufficient condition for reducing harm.
• A 2022 multi-pronged transitional pharmaceutical care program that included medication reconciliation did not decrease the proportion of patients experiencing an ADE after discharge.
• Electronic health record and IT-based reconciliation tools are widely studied, but their effect on discrepancy rates and clinical outcomes remains unclear; the 2016 review found electronic tools often lacked the functionality to accurately reconcile medications — which helps explain why discrepancies persist even at organizations with fully integrated EHRs.

AHRQ’s own framing of this is instructive for anyone designing or auditing a reconciliation program: medication reconciliation is an example of a safety intervention that has been effective in controlled research settings but has proven difficult to implement successfully in general practice. A 2016 commentary AHRQ cites attributes this gap to three recurring factors — the resource intensity of effective interventions (particularly dedicated clinical pharmacist time, which disincentivizes investment), the workflow disruption interventions introduce, and competition between reconciliation and other quality-improvement priorities such as patient-flow throughput.

Where Reconciliation Sits in Accreditation Requirements

Medication reconciliation was originally introduced as its own National Patient Safety Goal — NPSG #8 in 2005 — before being folded, since July 2011, into NPSG #3, “Improving the safety of using medications.” As AHRQ’s primer describes it, that goal requires organizations to obtain information on the medications a patient is currently taking at the time of hospital admission or an outpatient visit, and to compare that information against the medications ordered by the hospital, in order to identify and resolve discrepancies. Note that our separate National Patient Safety Goals guide covers the broader 2026 restructuring of Joint Commission goal chapters (including the Hospital/CAH move to a renamed National Performance Goals chapter) — confirm which chapter and goal number currently governs medication-related requirements for your specific accreditation program rather than assuming the 2011 NPSG #3 numbering still applies verbatim in 2026.

Emerging Strategies

AHRQ’s primer describes several directions programs are exploring to make reconciliation more efficient and effective, given the resource constraints above: targeting reconciliation effort toward the highest-risk patients and medications rather than applying uniform effort to every transition; increasing patient and caregiver engagement in maintaining an accurate medication list, including in outpatient and emergency department settings; and using trained pharmacy technicians, rather than pharmacists, for portions of the reconciliation workflow to reduce cost while preserving the pharmacist-led review shown to be effective in the evidence above.

Related CASRAI Guides

Medication reconciliation failures that result in serious patient harm may meet a hospital’s criteria for a sentinel event review, and process-level discrepancies are a common topic at M&M conferences even when the outcome does not rise to that threshold. A related class of medication error — selecting the wrong drug from a list of orthographically similar names — is addressed by a different control, the tall man lettering conventions published separately by FDA and ISMP.

Frequently Asked Questions

Is medication reconciliation required by law?

It is not a standalone federal statute. It functions as an accreditation requirement — historically a distinct National Patient Safety Goal, now incorporated into the medication-safety goal — and hospitals typically build it into policy to meet that accreditation standard; the exact current chapter and goal number should be confirmed against your program’s current Joint Commission manual.

Does medication reconciliation reduce hospital readmissions?

The evidence does not clearly support that specific outcome. AHRQ’s review of the literature found that while pharmacist-led reconciliation reduces medication discrepancies and potential adverse drug events, medication reconciliation alone has not been shown to reduce readmissions or other adverse events after discharge — the clinical effect of the discrepancies it catches appears to be smaller than intuition suggests.

Who is responsible for medication reconciliation — the physician, nurse, or pharmacist?

Practice varies by institution, and the evidence base most strongly supports pharmacist-led or pharmacist-involved reconciliation processes at admission, in-hospital transfer, and discharge. Some programs use trained pharmacy technicians for portions of the workflow to manage the resource intensity, with pharmacist review retained for higher-risk cases.

At which transitions does medication reconciliation need to happen?

Three: hospital admission, any transfer between units or levels of care within a hospitalization (for example, into or out of the ICU), and discharge to home or another facility. Each is a separate reconciliation event against the medication list in use immediately before that transition, not a single reconciliation performed once at admission.

Why do medication discrepancies still happen at hospitals with a full electronic health record?

Because an EHR containing accurate data is not the same as a reconciliation tool that correctly compares two medication lists. AHRQ’s review found that electronic reconciliation tools often lack the functionality to reconcile medications accurately, which is a documented reason discrepancies persist even at organizations with fully integrated EHRs.