Telehealth Modalities and Regulatory Definitions

The Regulatory Taxonomy of Telehealth

The term "telehealth" encompasses a spectrum of clinical activities delivered through telecommunications technology, but regulatory frameworks — including Medicare coverage rules, state licensure boards, and professional practice acts — do not treat all forms of remote care identically. Understanding the precise definition of each modality is essential for compliance with coverage requirements, scope of practice limitations, and documentation standards.

The Centers for Medicare & Medicaid Services (CMS) distinguishes between telehealth services, telemedicine, and telecommunications technologies in ways that directly affect billing codes, place of service designations, and reimbursement eligibility. State medical boards, nursing boards, and pharmacy boards layer additional definitions atop the federal framework, creating a complex regulatory matrix that practitioners must navigate for every remote clinical encounter.

Synchronous Telehealth: Real-Time Interactive Services

Synchronous telehealth refers to live, two-way audio-video communication between a provider and patient, occurring in real time. This is the modality most commonly associated with the term "telehealth visit" and is the primary modality recognized by Medicare Part B for payment under Section 1834(m) of the Social Security Act.

For Medicare purposes, synchronous telehealth includes services such as office visits, consultations, individual psychotherapy, and pharmacologic management delivered via interactive telecommunications systems. The statute historically required both audio and video components to qualify as telehealth; audio-only services were excluded. However, temporary flexibilities adopted during the COVID-19 Public Health Emergency (PHE) expanded coverage to include audio-only services for certain E/M codes and behavioral health services — flexibilities that Congress later extended or made permanent through the Consolidated Appropriations Act of 2023.

State medical boards generally recognize synchronous telehealth as falling within the scope of practice for licensed physicians, nurse practitioners, physician assistants, and clinical pharmacists when the clinical service itself is within their scope. However, boards impose specific requirements: informed consent for telehealth delivery, technology standards (such as HIPAA-compliant platforms), and documentation that the synchronous encounter met the same standard of care as an in-person visit.

Asynchronous Telehealth: Store-and-Forward Services

Asynchronous telehealth, also called "store-and-forward," involves the transmission of recorded health information — such as images, video clips, or clinical data — for review and interpretation by a provider at a later time. Common examples include dermatology photographs, retinal imaging, and radiology readings.

Medicare's coverage of asynchronous telehealth is highly restricted. Under Section 1834(m), asynchronous services are covered only in federal telemedicine demonstration programs in Alaska and Hawaii. For all other states, Medicare Part B does not reimburse store-and-forward services as telehealth, though certain asynchronous components may be bundled into other billing codes (such as remote interpretation of diagnostic tests).

State regulations vary significantly. Alaska and Hawaii have established regulatory frameworks that explicitly recognize asynchronous telehealth as a valid modality for establishing patient relationships and delivering diagnostic services. Other states permit asynchronous services only as a supplement to synchronous or in-person care, not as a standalone basis for diagnosis or treatment.

For pharmacists, asynchronous review of medication therapy management (MTM) data or prescription refill requests may be within scope in states with collaborative practice agreements, but pharmacists must verify that state pharmacy practice acts permit asynchronous clinical decision-making without real-time patient interaction.

Remote Patient Monitoring: Data Transmission and Clinical Interpretation

Remote Patient Monitoring (RPM) refers to the use of digital technologies to collect health data from patients in one location and electronically transmit it to providers in a different location for assessment and clinical recommendations. RPM typically involves devices such as blood pressure cuffs, glucose monitors, pulse oximeters, and weight scales.

CMS distinguishes RPM from telehealth services. RPM is billed using specific CPT codes (99453, 99454, 99457, 99458, 99091) that reflect device setup, data transmission, and provider review time. Unlike telehealth services, RPM does not require the patient to be located in a rural area or at an originating site, and it does not require real-time interaction. RPM codes are not subject to the geographic or originating site restrictions that apply to traditional telehealth under Section 1834(m).

For nurses, scope of practice for RPM depends on state Nurse Practice Acts. Registered nurses (RNs) may monitor transmitted data and escalate abnormal findings to physicians, but independent clinical decision-making based on RPM data may require advanced practice registered nurse (APRN) licensure. Licensed practical nurses (LPNs) are generally excluded from independent RPM review in most states.

Pharmacists' role in RPM is expanding, particularly for chronic disease management. Some states permit clinical pharmacists to independently adjust medication regimens based on RPM data under collaborative practice agreements or provider-status statutes, while others limit pharmacists to recommending changes to supervising physicians.

Audio-Only Telehealth: The Policy Evolution

Audio-only telehealth refers to clinical services delivered via telephone without video. Before the COVID-19 PHE, Medicare excluded audio-only services from the definition of telehealth under Section 1834(m), requiring both audio and video components for reimbursement.

During the PHE, CMS expanded coverage to include audio-only evaluation and management (E/M) services and behavioral health visits, recognizing that some beneficiaries lacked broadband access or smartphone technology necessary for video visits. The Consolidated Appropriations Act of 2023 extended audio-only coverage for behavioral health services through December 31, 2024, and made permanent certain audio-only mental health services for established patients in rural areas.

State medical boards have taken varied positions on audio-only services. Some boards, including those in Texas and Florida, issued emergency orders permitting audio-only telehealth during the pandemic but have since reverted to requiring audio-video for initial consultations. Other states, such as California, permit audio-only services for established patients but require video for new patient encounters unless documented barriers to video access exist.

For pharmacists, audio-only consultation has long been a standard practice for medication counseling and MTM services. State pharmacy boards generally permit audio-only interactions for prescription verification, drug utilization review, and patient education, but prescribing authority via audio-only varies significantly.

Profession-Specific Scope of Practice Boundaries

Physicians' scope of practice for telehealth is typically coextensive with their in-person scope, meaning any clinical service a physician is licensed to perform in person may be performed via telehealth unless state law or specialty board policy restricts it. State medical boards have issued telehealth-specific guidance limiting certain services — such as initial prescribing of controlled substances (discussed in Unit 4) — but physicians generally have broad telehealth authority.

Nurse practitioners and physician assistants operate under state-specific scope of practice acts that may impose additional telehealth restrictions. Some states require collaborative practice agreements to extend to telehealth services, meaning a supervising physician must explicitly authorize telehealth delivery. Other states grant full practice authority to NPs but require separate telehealth protocols or informed consent processes.

Pharmacists' telehealth scope is the most variable. States with provider-status laws (such as California SB 493 and Idaho's collaborative practice framework) permit clinical pharmacists to deliver MTM, chronic disease management, and certain prescribing services via telehealth. States without provider-status laws limit pharmacists to dispensing-related services and patient education. Pharmacists must verify that each clinical activity — medication therapy management, vaccination counseling, naloxone dispensing — is explicitly authorized under the state pharmacy practice act before delivering it via telehealth.

CMS Definitions and Their Impact on Coverage

The Medicare telehealth statute at 42 U.S.C. § 1395m(m) defines "telehealth services" as professional consultations, office visits, and office psychiatry services furnished by a physician or practitioner to a beneficiary via an interactive telecommunications system. The term "interactive telecommunications system" is defined as multimedia communications equipment that includes, at a minimum, audio and video equipment permitting two-way, real-time interactive communication.

This statutory definition controls Medicare Part B coverage. Services that fall outside the definition — such as asynchronous store-and-forward (except in Alaska and Hawaii), email consultations, and patient portal messages — are not reimbursable as telehealth services under Section 1834(m), though they may be compensated under other payment models such as Chronic Care Management (CCM) or Transitional Care Management (TCM).

State Medicaid programs are not bound by the Medicare definition. Many state Medicaid agencies have adopted broader definitions of telehealth that include asynchronous services, audio-only visits, and remote consultations via secure messaging. Practitioners must consult the Medicaid state plan and provider manual for each state where they deliver telehealth services to determine which modalities are covered.

Licensure Implications of Modality Choice

The choice of telehealth modality does not alter the fundamental licensure requirement: a provider must be licensed in the state where the patient is located at the time of service. However, some state boards have adopted modality-specific rules that affect licensure obligations.

For example, the Federation of State Medical Boards (FSMB) Model Policy on telehealth clarifies that synchronous telehealth establishes a physician-patient relationship and triggers the same standard of care as in-person visits, while asynchronous consultations (such as curbside consults between physicians) may not establish a relationship if no diagnosis or treatment is provided. This distinction matters for licensure: a physician providing an asynchronous opinion to another physician may not need licensure in the patient's state if the consulting physician does not directly interact with or treat the patient.

Nurses and pharmacists face similar distinctions. Asynchronous review of medication data by a pharmacist in one state, transmitted by a physician in another state, may not trigger licensure requirements if the pharmacist does not communicate directly with the patient. But if the pharmacist contacts the patient to recommend therapy changes, licensure in the patient's state is required.

Understanding the interplay between modality, scope of practice, and licensure is the foundation for compliant telehealth delivery across all healthcare professions.