Sig code: route
IN medical abbreviation
IN means "intranasal".
On the ISMP List of Error-Prone Abbreviations. ISMP suggests: Write "intranasal".
Each meaning matched at least two public references (2 in all for IN), checked October 23, 2026. The table lists them.
Run it in Rivvi
Expand every abbreviation in a sig line
Paste a sig line, a note, or a claim and Rivvi spells out each abbreviation and flags the ones on the Do Not Use list.
Ask RivviFree to start. No card. Opens Rivvi, the AI workspace for healthcare teams.
What IN means
| Meaning | Latin origin | Where used | Checked against |
|---|---|---|---|
| intranasal | None | Prescriptions, Medication labels |
Example
Training example of an error-prone entry: "IN" on an order.
A made-up line that shows the abbreviation in place. It is not about any patient and is not an instruction.
Related abbreviations
Elsewhere on Rivvi
Questions
What does IN mean in medical terms?
IN means "intranasal".
Where is IN used?
IN shows up in prescriptions and medication labels. Its category here is sig code: route.
Is IN on the Joint Commission Do Not Use list?
No, but ISMP lists IN as an error-prone abbreviation. ISMP's suggested practice: Write "intranasal".