Infusion Administration CPT Codes: 96365, 96366, and 96374

Last reviewed: May 2026

Free CPT Code Finder Editorial • Updated May 2026 • 5 min read

Infusion administration coding is not complicated, but it gets butchered because the note says what drug was given and forgets the clock. For these codes, time is not decorative. Time is the code.

The basic decision

Start with how the medication actually went in. If it ran as an IV infusion, code the infusion time. If it was given as a rapid IV push, do not pretend it was an infusion just because the medication sounds fancy.

96365 — therapeutic, prophylactic, or diagnostic IV infusion; initial, up to 1 hour.
96366 — each additional infusion hour. This is an add-on code, not a standalone primary code.
96374 — therapeutic, prophylactic, or diagnostic IV push; initial or single substance/drug.

What has to be documented

The documentation needs start time, stop time, route, medication, and whether the service was infusion versus push. A vague line like “medication administered IV” is not enough if you want the code to survive review.

How the time logic works

Use 96365 for the first infusion hour. If the infusion continues long enough to support additional hours, then add 96366 for each additional reportable hour. If the service is a rapid IV push instead, the cleaner code is usually 96374.

Common ways people screw this up

Billing 96366 without a primary infusion code.
Calling a push an infusion because the medication was high-cost or high-attention.
Documenting dose and response but not start and stop times.
Stacking administration codes without proving distinct administration services.

wRVU reality check

These are low-wRVU codes. In the Free CPT Code Finder database, 96365 is listed at 0.21 wRVU, 96366 at 0.18 wRVU, and 96374 at 0.18 wRVU. That is exactly why clean documentation matters. There is no reason to create denial risk over a small line item.

Bottom line

For infusion administration, code the route and the clock. First infusion hour is 96365, additional supported infusion hours are 96366, and rapid IV push is 96374. If the note does not prove the time, the claim is weaker than it needs to be.