Telehealth Glossary of Terms and Definitions
This page provides structured definitions for the terminology, abbreviations, and regulatory concepts that appear across telehealth policy, clinical practice, and reimbursement frameworks in the United States. Each entry maps to a specific operational or regulatory context, making distinctions between terms that are frequently conflated in both clinical documentation and public discourse. Accurate use of telehealth terminology is required for compliance with federal coding standards, state licensure rules, and payer billing policies.
Definition and scope
Telehealth is defined by the Health Resources and Services Administration (HRSA) as the use of electronic information and telecommunications technologies to support and promote long-distance clinical health care, patient and professional health-related education, public health, and health administration (HRSA Telehealth). This definition is broader than the term telemedicine, which is generally limited to direct clinical care delivered remotely — a distinction explored in depth at Telehealth vs. Telemedicine Definitions.
The scope of this glossary covers:
- Delivery modality terms — synchronous, asynchronous, store-and-forward, remote patient monitoring
- Regulatory and billing terms — originating site, distant site, place of service (POS) code, HCPCS codes, CPT modifiers
- Licensure and jurisdictional terms — interstate compact, practice nexus, telepresenter
- Technology terms — mHealth, wearable integration, EHR interoperability
- Policy classification terms — parity law, coverage mandate, Ryan Haight Act, PSYCH Act
The Centers for Medicare & Medicaid Services (CMS) publishes annual updates to telehealth-eligible services lists, procedure codes, and covered originating sites within the Physician Fee Schedule (CMS Physician Fee Schedule). Definitions within this glossary reflect statutory and regulatory language where available, not colloquial usage.
How it works
Telehealth terminology functions as a classification system. A term's precise meaning determines eligibility for reimbursement, compliance obligations under the Health Insurance Portability and Accountability Act of 1996 (HIPAA), and which state licensure laws apply. The following core terms operate as the foundation of this classification system:
Synchronous telehealth — Real-time, two-way audiovisual interaction between a patient and a clinician. Medicare requires a HIPAA-compliant interactive audio and video telecommunications system for most synchronous visits. See Synchronous vs. Asynchronous Telehealth for a structured comparison.
Asynchronous telehealth (store-and-forward) — Transmission of recorded health information (images, video clips, biometric data) to a clinician who reviews it at a later time without the patient present. Common in dermatology and radiology. The patient and provider are not connected in real time. Full treatment at Store-and-Forward Telehealth.
Remote Patient Monitoring (RPM) — Collection of physiologic data from a patient at a location other than a clinical site, transmitted electronically to a provider. CMS covers RPM under CPT codes 99453, 99454, 99457, and 99458, with specific requirements for 16 days of data collection per 30-day period (CMS RPM Fact Sheet).
Originating site — The location where the patient is situated during a telehealth encounter. Pre-2020 Medicare rules restricted originating sites to specific rural Health Professional Shortage Areas (HPSAs). Pandemic-era waivers, codified through legislation, expanded eligible originating sites to include the patient's home.
Distant site — The location of the treating clinician during a telehealth encounter. The provider at the distant site must hold a valid license in the state where the patient is physically located at the time of service.
POS Code 02 — The CMS Place of Service code designating telehealth services provided when the patient is not in their home. POS Code 10 designates telehealth services provided to a patient in their home, introduced by CMS for dates of service on or after January 1, 2022 (CMS POS Codes).
GT Modifier / 95 Modifier — HCPCS modifier GT ("via interactive audio and video telecommunications systems") and CPT modifier 95 are used to identify synchronous telehealth claims. Not all payers accept both; Medicare primarily uses modifier 95 for institutional claims.
FQHC (Federally Qualified Health Center) — A community-based health care provider that receives funds from the HRSA Health Center Program under Section 330 of the Public Health Service Act. FQHCs operate under specific telehealth billing rules distinct from private practices. See Federally Qualified Health Center Telehealth.
Urban Indian Organization (UIO) — Effective January 5, 2021, urban Indian organizations and their employees are deemed to be part of the Public Health Service for purposes of certain personal injury claims, pursuant to enacted legislation deeming UIOs part of the Public Health Service for purposes of certain claims for personal injury. This designation affects liability and coverage frameworks applicable to telehealth services delivered through UIOs, aligning their federal tort claims treatment with that of other Public Health Service entities. Telehealth providers operating within UIOs are subject to federal tort claims procedures rather than standard civil liability frameworks for covered personal injury claims arising from their services.
Common scenarios
Licensure portability terms appear frequently in multi-state practice contexts. The Interstate Medical Licensure Compact (IMLC), administered by the Interstate Medical Licensure Compact Commission (IMLCC), allows eligible physicians to obtain expedited licensure in member states. As of 2024, 39 states, the District of Columbia, and Guam participate in the IMLC (IMLCC). The term practice nexus refers to a physician's state of principal license under the Compact.
Controlled substance prescribing terms arise under the Ryan Haight Online Pharmacy Consumer Protection Act of 2008 (21 U.S.C. § 831), which requires at least 1 in-person medical evaluation before a practitioner may prescribe Schedule II–V controlled substances via the internet. Pandemic-era DEA waivers temporarily suspended this requirement; subsequent DEA rulemaking under proposed "telemedicine prescribing rules" has addressed permanence of those accommodations. Full regulatory framing at DEA Telemedicine Prescribing Regulations.
Parity law refers to state statutes requiring private insurers to reimburse telehealth services at the same rate as equivalent in-person services. As of 2023, 43 states plus the District of Columbia had enacted some form of telehealth payment parity law, though scope and enforcement vary significantly by state (National Conference of State Legislatures, 2023). See Private Insurance Telehealth Parity Laws.
mHealth — Mobile health; the use of mobile devices and wireless technology for health service delivery, disease monitoring, or patient engagement. Defined by the World Health Organization in the 2011 mHealth: New horizons for health through mobile technologies report.
Telepresenter — A licensed or trained clinical staff member physically present with the patient during a synchronous telehealth visit, assisting a remote provider. Required in certain RPM and telestroke protocols.
Decision boundaries
Proper term selection determines how a telehealth service is classified, billed, and regulated. Key distinctions:
Telehealth vs. telemedicine — Telehealth is the broader administrative and educational category; telemedicine is the clinical subset. Payers, states, and federal agencies do not apply these terms uniformly. A billing claim coded under telemedicine billing rules may not align with a state statute written around the telehealth definition.
Synchronous vs. asynchronous — Medicare does not reimburse most asynchronous store-and-forward encounters under the standard telehealth benefit (exceptions exist for Alaska and Hawaii federal demonstration programs). A provider billing a store-and-forward interaction as a synchronous visit represents a false claims risk under the False Claims Act (31 U.S.C. §§ 3729–3733).
RPM vs. remote therapeutic monitoring (RTM) — RPM (CPT 99453–99458) covers physiologic data; RTM (CPT 98975–98980) covers therapeutic adherence and response data from musculoskeletal and respiratory conditions. These are distinct benefit categories under CMS with separate qualifying thresholds.
Audio-only vs. audiovisual — Audio-only telehealth is not equivalent to synchronous audiovisual telehealth under Medicare rules. Certain evaluation and management (E/M) codes are payable for audio-only encounters when a patient lacks video access, but at different rates and with different code sets than audiovisual visits. The Telehealth HIPAA Compliance Requirements page addresses how the audio-only modality affects the HIPAA Security Rule's technical safeguard requirements.
Covered entity vs. business associate — Under HIPAA (45 CFR Parts 160 and 164), a telehealth platform that stores, processes, or transmits protected health information (PHI) on behalf of a covered healthcare provider is a business associate, not a covered entity, and must execute a Business Associate Agreement (BAA). This classification affects which HIPAA rules apply directly versus contractually.
Urban Indian Organization liability classification — Effective January 5, 2021, urban Indian organizations and their employees are deemed part of the Public Health Service for purposes of certain personal injury claims, pursuant to enacted legislation specifically deeming UIOs part of the Public Health Service for purposes of certain claims for personal injury. Telehealth services delivered through a UIO are subject to federal tort claims procedures rather than standard civil liability frameworks, a distinction that affects malpractice coverage requirements and claims routing for telehealth providers operating within those organizations. This deemed status applies specifically to personal injury claims and aligns UIOs with other Public Health Service entities for those purposes.
For reimbursement code lookups, benefit period definitions, and state-by-state parity enforcement standards, the Telehealth Regulatory Framework — United States page provides structured regulatory context organized by federal authority and state jurisdiction.
References
- HRSA — Telehealth Programs and Definitions
- Centers for Medicare & Medicaid Services — Telehealth Coverage and Codes
- CMS — Physician Fee Schedule
- CMS — Place of Service Codes for Professional Claims
- Public Health Service Act — Urban Indian Organization Deemed Status (effective January 5, 2021)