CPT 99445 vs. 99454: How to Choose the Right Code Every Month

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One of the most consequential billing decisions an RPM program makes every month is which device supply code to bill. In 2025, there was only one option: CPT 99454, requiring 16+ days of readings. In 2026, there are two — and picking the wrong one is one of the most common audit triggers in RPM billing.

The decision tree is simple:

• 0–1 days of readings: Bill neither. No device supply code is justified.
• 2–15 days of readings: Bill CPT 99445 ($52.11/month)
• 16+ days of readings: Bill CPT 99454 ($52.11/month)

Both codes reimburse at the same rate in 2026. The distinction isn't financial — it's a documentation accuracy requirement. Billing 99454 when your records show 12 days of readings isn't an honest mistake auditors overlook. It's a misrepresentation that triggers repayment and, in patterns, referral for investigation.

What documentation must show: Your records need to reflect the specific number of days readings were received for each patient in each billing period. A general note saying "patient was monitored throughout the month" doesn't satisfy either code. You need a day count. Most RPM platforms generate this automatically — the failure point is usually in the billing workflow, where staff submits claims without verifying the count from the platform first.

The monthly verification step most programs skip: Before claims go out, someone should be checking the previous month's day counts for every enrolled patient and routing each one to the correct code. This takes minutes per patient when systematized. It prevents the most common RPM billing error in 2026. And it ensures you're capturing revenue from 99445 for patients who would have previously generated nothing.

The best RPM billing workflows treat code selection as a data-driven decision, not an assumption. The data — the day count — lives in your monitoring platform. The workflow just needs to connect it to the right code before the claim is filed.

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