RTM Supervising-Provider & Incident-To Billing Requirements

Whether RTM billing is “incident-to” depends entirely on who is furnishing the care. When a physical therapist, occupational therapist, or speech-language pathologist furnishes RTM under a therapy plan of care, it bills under that clinician's own NPI with the GP, GO, or GN modifier, under general supervision — incident-to doesn't apply. When clinical staff, including a nurse practitioner or physician assistant, furnish RTM-related services on behalf of a supervising physician, the physician can bill it incident-to under their own NPI at 100% of the fee schedule if incident-to's conditions are met, or the NP/PA can bill it independently under their own NPI at 85%.

This distinction trips up practices that assume “incident-to” is a blanket RTM rule. It isn't — it's a specific billing relationship that applies to some RTM claims and not others, and mixing them up on a claim is a documentation and compliance risk, not just a paperwork nuance.

The three ways RTM gets billed

RTM's billing rules don't come from one uniform path — they follow whichever clinician is actually furnishing the care:

• Therapist-furnished (PT/OT/SLP). Billed under the therapist's own NPI, always under a therapy plan of care, carrying the GP (PT), GO (OT), or GN (SLP) modifier. This is by far the most common path for MSK practices and is not an incident-to relationship — the therapist is the billing provider, not clinical staff working on a physician's behalf.
• Physician-furnished, billed by the physician. The physician (or, for RTM, more commonly their practice's clinical staff acting on the physician's plan of care) bills under the physician's own NPI. No incident-to distinction applies because the billing provider and the furnishing/supervising provider are the same person.
• NP/PA-furnished, on behalf of a physician's practice. This is where incident-to becomes relevant: an NP or PA can bill either incident-to the supervising physician (100% of the fee schedule, under the physician's NPI, if incident-to's conditions are met) or independently under their own NPI (85% of the fee schedule, no incident-to chain required).

Incident-to is a specific billing relationship for physician-practice staff — not a universal RTM rule.

What incident-to actually requires

Incident-to billing lets a service furnished by auxiliary personnel — potentially including an NP or PA — be billed under the supervising physician's NPI at the full (100%) fee schedule rate, rather than the 85% rate that applies when a non-physician practitioner bills independently under their own NPI. The conditions, from 42 CFR 410.26, are specific:

• The supervising physician personally performed an initial service and established the plan of care the RTM monitoring follows.
• The physician remains actively involved in the course of treatment, not just the initial visit.
• The supervising physician provides direct supervision — immediately available to furnish assistance and direction throughout the service.

Miss any of these and the incident-to billing path isn't available — the NP or PA bills independently instead, at 85%.

General supervision vs. direct supervision for RTM

Don't conflate two different supervision questions. First: what supervision level does RTM itself require? RTM is a designated care-management service, billable under general supervision — the supervising provider doesn't need to be on site while the monitoring and management happen. Second, and separately: what supervision does incident-to billing specifically require? That's direct supervision — the physician immediately available, which is a higher bar than general supervision, and only relevant when someone is trying to bill under the physician's NPI via the incident-to path.

The CY2026 Physician Fee Schedule permanently adopted virtual direct supervision: the “immediately available” requirement can now be met via real-time, two-way audio-video instead of requiring the physician to be physically in the office suite. Audio-only doesn't count — the supervising physician must be able to both see and hear what's happening and provide immediate guidance. One important carve-out: virtual direct supervision is not available for services tied to a 10- or 90-day global surgical period indicator — relevant for orthopedic practices where a chunk of RTM activity sits inside a post-op global window.

Separately, PTA/OTA assistants working under the supervising PT/OT's general supervision in private practice is permanent policy; unenrolled PTs/OTs still need direct supervision. Where the CQ/CO assistant-services modifier and its 15% payment reduction apply, it reaches 98975, 98979, 98980, and 98981 — not the device-supply codes 98977 or 98985.

Who bills what, at what rate

Descriptors and structure per 42 CFR 410.26 and the CY2026 Medicare Physician Fee Schedule final rule (CMS-1832-F). Confirm specifics with your MAC and compliance counsel.

Common mistakes

Assuming incident-to applies to therapist-furnished RTM. It doesn't — a PT billing under their own NPI with the GP modifier is never an incident-to claim, regardless of who else in the practice is involved.

Treating general supervision and direct supervision as interchangeable. RTM itself only requires general supervision. Direct supervision is a separate, higher bar that only matters if you're specifically trying to bill incident-to a physician.

Missing the global-period carve-out for virtual direct supervision. If the RTM activity is connected to a procedure with a 10- or 90-day global indicator, virtual direct supervision doesn't satisfy incident-to — it needs to be in person.

Applying the CQ/CO assistant modifier to device-supply codes. It doesn't reach 98977 or 98985 — only the setup and management codes (98975, 98979, 98980, 98981).

FAQ