Electronic Health Record
Also known as: EHR, EMR, Electronic Medical Record, patient record system
An Electronic Health Record (EHR) is a digital version of a patient's medical chart, containing diagnoses, medications, allergies, lab results, visit notes, and imaging records.
Unlike paper charts, EHRs can be shared securely across different healthcare providers and systems. EHRs are the central technology in modern healthcare delivery and are regulated under strict privacy laws (HIPAA in the US; in Canada, provincial health privacy laws such as Ontario's PHIPA). Major EHR vendors include Epic, Oracle Health (formerly Cerner), and MEDITECH.
Also covered here: EMR
Electronic Health Record, explained at three levels
At home
An EHR is the digital version of your medical records: your diagnoses, prescriptions, test results, and doctor's notes, stored in a computer system instead of paper files. When you visit a clinic, the doctor types their notes directly into the EHR while you're in the room. If you visit a different clinic in the same health network, they can see your records electronically without you having to explain your history again.
At work
Healthcare professionals interact with EHRs constantly during every patient encounter: documenting visit notes, ordering prescriptions, reviewing lab results, and scheduling follow-ups. The EHR is also how care teams communicate about a patient: a hospital doctor can see what the patient's family doctor documented, and the pharmacist can see the prescriptions ordered by any provider.
At home
Patient portals are the consumer-facing layer of EHR systems: they let you view your own health records, test results, and visit summaries, request prescription refills, and message your care team. MyChart (Epic's patient portal) and FollowMyHealth are the most common. Your right to access your own EHR data is protected by law in the US, Canada, and the EU.
At work
EHRs contain structured and unstructured data. Structured data (diagnoses coded in ICD-10, medications, lab values, vitals) can be queried and analyzed systematically. Unstructured data (physician notes, discharge summaries) requires natural language processing to extract clinical meaning at scale. Clinical Decision Support tools within EHRs alert providers to drug interactions, missing preventive care, or abnormal results in real time during documentation.
At home
The shift to FHIR (Fast Healthcare Interoperability Resources) APIs is making it easier for patients to share their health data with third-party apps: fitness trackers, personal health apps, and research platforms. US rules now require EHR vendors to offer FHIR-based patient data access. This is beginning to break down the historical silos that prevented patients from easily moving their records between health systems.
At work
EHR implementation is one of the most complex IT projects in any industry. Epic implementations (the largest EHR vendor) typically take 18-36 months and cost tens to hundreds of millions of dollars for large health systems. Workflow redesign, how clinical staff document and communicate, is as important as the technology itself. Post-go-live, EHRs require ongoing configuration management, physician training, and optimization as clinical workflows evolve. HIPAA compliance, access audit logs, and break-the-glass emergency access are non-negotiable security requirements.
Real-world examples
At home
Thomas had a blood test at his family doctor's office. A week later, he logged into his patient portal (MyChart) on his phone, saw his results, noticed his cholesterol was slightly elevated, and sent a message to his doctor asking what dietary changes were recommended, all without calling the clinic or waiting for a letter.
At work
Nadia, a hospital CMIO (Chief Medical Information Officer), led a 30-month Epic implementation across a 1,200-bed health system. She oversaw build configuration, trained 3,500 clinical staff, coordinated the data migration from the legacy system, and managed the go-live weekend where the old system was shut off and Epic went live simultaneously across all departments.
Common confusions
- People often use EHR and EMR interchangeably as if they mean the same thing — An EMR (Electronic Medical Record) is a digital record within a single practice: it doesn't travel with the patient outside that organization. An EHR (Electronic Health Record) is designed to share data across different providers and health systems. The industry has largely moved toward EHR as the standard term, but older systems and clinicians still use EMR.
- Many assume that EHR systems automatically share data between any two providers — EHR interoperability is still limited in practice. Two hospitals using different EHR vendors (Epic and Oracle Health, for example) may not share records automatically even though the technology exists. Data sharing depends on whether health systems have established interoperability agreements, what regional health information exchanges (HIEs) exist, and whether patients have consented to sharing. FHIR-based sharing is improving this, but fragmentation remains significant.
- Some think EHRs make documentation faster for clinicians — Many physicians report that EHRs increase documentation burden significantly compared to paper charts. The need to navigate complex screens, meet billing documentation requirements, and satisfy compliance checkboxes often results in doctors spending as much time on documentation as on patient care. Physician burnout related to EHR documentation burden is a significant healthcare workforce issue.
For analysts
When a healthcare client is considering an EHR change or optimization, the key question is not which EHR features they want but what clinical and administrative workflows are failing and why. EHR problems are almost never pure technology problems: they're usually workflow design problems that happen to manifest in the EHR. Start with clinical workflow observation before making technology recommendations.
History & origin
Early electronic medical record systems appeared in the 1960s and 1970s in academic medical centres, but adoption was slow due to cost and complexity. The US Health Information Technology for Economic and Clinical Health (HITECH) Act in 2009 provided billions in financial incentives for healthcare providers to adopt certified EHRs, driving rapid adoption through the 2010s. By 2021, over 96% of US hospitals had implemented a certified EHR system. Canada, the UK (NHS), and Australia followed similar digitization paths. Interoperability, the ability to share records between different EHR systems, remains a major ongoing challenge.