RTM billing modifiers and place of service codes

What changed in 2026

The old RTM billing shorthand is no longer good enough. As of 2026, the musculoskeletal device-supply side is split between 98985 for 2 to 15 days and 98977 for 16 to 30 days. On the management side, 98979 was added as the first 10-minute treatment management code, alongside 98980 and 98981.

That matters for modifiers too. Therapists still need GP, GO, or GN when they furnish RTM under a therapy plan of care, but the assistant modifier rule is narrower than many clinics assume. Under current CMS policy, the de minimis assistant logic applies to 98975, 98979, 98980, and 98981. It does not apply the same way to the musculoskeletal device-supply codes 98985 and 98977.

The simplest way to think about modifiers

Start with the therapy discipline. If the RTM service is being furnished by a therapist under a therapy plan of care, the claim needs GP, GO, or GN.

Then ask whether a PTA or OTA crossed the de minimis threshold. If yes, add CQ or CO, but only for the RTM codes CMS puts under that rule. That is 98975, 98979, 98980, and 98981.

Only after that should you ask whether a payer wants telehealth reporting on the real-time interactive portion. That is the step clinics jump to too quickly. It is the least universal part of the modifier decision tree.

What hospital-based clinics should notice

The 2026 CMS update created a detail many summaries miss. The supply-side RTM codes, including 98975, 98977, and 98985, are paid under the physician fee schedule in most settings, but on outpatient hospital bill type 13X they are paid under OPPS. The treatment management codes 98979, 98980, and 98981 are handled differently and remain paid under the physician fee schedule when furnished under therapy plans of care by therapists and supervised PTAs or OTAs on TOB 13X.

So if you are a hospital-based outpatient department, do not assume the same payment logic applies to every RTM line item just because the family of codes looks similar.

Practical billing examples

Private practice PT, no assistant involvement. A PT enrolls the patient, documents the set-up, the patient reaches 11 qualifying days in the 30-day period, and the PT performs 12 minutes of monthly treatment management with a live phone call. The likely stack is GP on the RTM services, no CQ, and the clinic would review whether the payer wants POS 11 only or telehealth POS reporting on the live interaction.

PTA helps with treatment management. If the PTA crosses the de minimis threshold on the management service, CQ can apply to 98979, 98980, or 98981 as appropriate, along with GP. But that assistant logic does not automatically roll onto 98985 or 98977.

Patient is home during a synchronous video interaction. The telehealth POS definitions tell you what 10 and 02 mean. They do not tell you that every RTM payer wants those POS codes. That is why payer instruction matters more than generic internet billing advice here.

Mistakes that cause avoidable denials

One common mistake is putting CQ or CO on 98985 or 98977 because the clinic assumes all RTM codes follow the same assistant logic. They do not.

Another is treating the live interactive touchpoint as if it automatically converts the entire RTM claim into a telehealth claim. Sometimes a payer wants telehealth reporting on that interaction. Sometimes it does not. Over-assuming here creates as many problems as under-reporting.

The last big one is using old code logic in 2026. If your internal cheat sheet still jumps from 98975 to 98977 to 98980, it is already out of date.

Related RTM pages

RTM overview for the full framework.

98975, 98985, 98977, 98979, 98980, and 98981 for code-specific guidance.

RTM 2026 codes explained for the full 2026 update.