CPT 99458: Remote Physiologic Monitoring Management, Each Additional 20 Minutes

CPT 99458 covers each additional 20 minutes of remote monitoring treatment management beyond the first. It is an add-on code, which means it inherits every rule of its primary and adds a few of its own about how time is counted.

What CPT 99458 covers

99458 is remote physiologic monitoring treatment management services, each additional 20 minutes, reported in addition to the code for the first 20 minutes.

Each unit requires a full additional 20 minutes. Time is not rounded up to reach the next unit, and partial increments do not generate a line.

Where 99458 sits in the RPM family

99458 is each additional 20 minutes of treatment management after the first 20 minutes billed under 99457 in the calendar month, and it is never billed without 99457. A month where management does not reach the first 20 minutes may fall under 99470, new for 2026, which covers the first 10 minutes. See the full RPM family, including the 2026 additions, on the CPT 99457 guide.

Check before billing 99458

99458 inherits every rule that applies to 99457: documented management time, supervision for clinical staff time, one reporting practitioner per period, and automatically uploaded data from an FDA-defined device. It is also subject to the order and consent that started the episode. See the family-wide RPM rules on the CPT 99454 guide.

Reimbursement context

2026 Medicare RVUs for CPT 99458

Source: CMS CY 2026 PFS Relative Value File, RVU26D (October release, published 08/26/2026). RVUs are national and unadjusted; commercial payers set their own rates.

In the 2026 CMS relative value file, CPT 99458 carries 0.61 work RVUs, with 1.24 total RVUs in a non-facility setting and 0.79 in a facility. The gap is practice expense: the office carries it in one setting and the facility in the other. Its PC/TC indicator is 0: CMS treats it as a physician service, so modifiers 26 and TC do not apply in any setting. Its global indicator is ZZZ: it is an add-on code, always reported with its primary service and falling inside that service's global period.

To turn RVUs into payment, each component is multiplied by your locality's geographic practice cost index, the three are added, and the sum is multiplied by the 2026 conversion factor: $33.4009, or $33.5675 for qualifying APM participants (CMS-1832-F; CMS fact sheet). The CMS Physician Fee Schedule Look-Up Tool runs that calculation for your locality.

Documentation requirements

• The order for remote monitoring and the patient's consent, dated before monitoring began.
• The condition being monitored and why remote monitoring is clinically appropriate.
• The device used, and that it meets the medical device definition.
• The number of days data was transmitted in the period, since the day count drives code selection.
• For management codes, the time spent and the date and nature of the interactive communication.
• The clinical decisions made in response to the data.
• A record that no other practitioner is billing RPM for this patient in the period.

Common denials and the exact fix

Modifier rules

• 25: on a same-day E/M where a separately identifiable service was provided beyond the monitoring, never on the 99458 line.
• 95 / telehealth modifiers: 99458 is not a telehealth service and does not generally take a telehealth modifier. Check payer instruction rather than assuming.
• 26 / TC: not used. CMS gives 99458 a PC/TC indicator of 0.
• Add-on rules: 99458 carries no modifier 51 and cannot be billed without 99457 on the claim.

NCCI bundling edits

• 99458 without its primary management code: add-on codes cannot be reported alone.
• 99458 with modifier 51: add-on codes are exempt from multiple-procedure reduction.
• 99458 with 99454 or 99445: separately reportable. Management and supply are different services.
• 99458 with a same-day E/M: the same minutes cannot be counted twice.
• Payer-specific unit caps may apply on top of the NCCI edits.

Frequently asked questions

Sources

American Medical Association, CPT 2026 Professional Edition.
Centers for Medicare & Medicaid Services, CY 2026 PFS Relative Value File RVU26D (October release): RVUs, PC/TC indicator and global period for CPT 99458.
Centers for Medicare & Medicaid Services, CY 2026 Physician Fee Schedule final rule, CMS-1832-F: conversion factors.
Centers for Medicare & Medicaid Services, National Correct Coding Initiative Policy Manual for Medicare Services and quarterly procedure-to-procedure edit tables.
CY 2026 PFS final rule, CMS-1832-F: remote physiologic monitoring provisions.

CPT® is a registered trademark of the American Medical Association. Payer policy and NCCI edits change quarterly, so check your own contractor before submission. How we verify this guidance.

Related codes

• CPT 99457. RPM management, first 20 minutes.
• CPT 99454. RPM device supply, 16 or more days of data.
• CPT 99453. RPM setup and patient education.

More cardiology code guides

• CPT 93784. 24-hour ambulatory blood pressure monitoring.

Related reading

• Cardiology billing & RCM. How we scrub cardiology claims across diagnostics, cath lab, EP and remote monitoring.
• Cardiac RPM billing compliance. Transmission windows, documentation and the rules that trip up remote monitoring claims.
• TC/26 modifier errors in cardiology. The split-billing mistakes that cost diagnostic practices the most.