U84.9 ICD-10-CA code: Resistance to unspecified antimicrobial drugs
U84.9 is the ICD-10-CA code for “Resistance to unspecified antimicrobial drugs” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
U84.9Resistance to unspecified antimicrobial drugs
Short description: Resist unspec antimicrobial drug
ICD-10-CA · Canada · Also written U849
Index terms
Entries in CIHI’s alphabetical index that lead to U84.9. Searching the index by the condition the note names is how coders reach this code.
- Resistance, resistant (to), antimicrobial drugs (NOS)
Notes for U84.9
As CIHI prints them, with any note U84.9 takes from the headings above it.
Includes
- Drug resistance NOSResistance to antimicrobial drugs NOS
Use additional code
Add a code for this detail when the note documents it.
- Use additional code (B95-B98) to identify agents resistant to antimicrobial drugs.From U84 Resistance to other antimicrobial drugs
Excludes
Conditions classified elsewhere.
- Resistance to antibiotics (U82-U83)From U84 Resistance to other antimicrobial drugs
Note
- This category should never be used in primary coding. These codes are provided for use as supplementary or additional codes to identify the resistance of a condition to antimicrobial drugs.From U84 Resistance to other antimicrobial drugs
Where U84.9 sits
- 1ChapterChapter 23: Provisional Codes for Research and Temporary Assignment
- 2Block U50-U99Provisional codes for research and temporary assignment in Canada
- 3Category U84Resistance to other antimicrobial drugs
- 4Valid code U84.9Resistance to unspecified antimicrobial drugs
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code U84.9 mean?
U84.9 is the ICD-10-CA code for “Resistance to unspecified antimicrobial drugs” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is U84.9 in ICD-10-CA?
U84.9 sits under U84 Resistance to other antimicrobial drugs, within U50-U99 Provisional codes for research and temporary assignment in Canada, within Chapter 23: Provisional Codes for Research and Temporary Assignment.
What coding notes apply to U84.9?
ICD-10-CA lists Includes, Note, Use additional code, Excludes notes for U84.9, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.