U85 ICD-10-CA code: Resistance to antineoplastic drugs
U85 is the ICD-10-CA code for “Resistance to antineoplastic drugs” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
U85Resistance to antineoplastic drugs
Short description: Resist antineoplastic drug
ICD-10-CA · Canada
Index terms
Entries in CIHI’s alphabetical index that lead to U85. Searching the index by the condition the note names is how coders reach this code.
- Cancer, refractory
- Refractory cancer (neoplasm)
- Cancer, non responsive to antineoplastic drugs
Notes for U85
As CIHI prints them, with any note U85 takes from the headings above it.
Includes
- Non-responsiveness to antineoplastic drugsRefractory cancer
Note
- This category should never be used in primary coding. This code is provided for use as a supplementary or additional code to identify the resistance, non-responsiveness and refractive properties of a condition to antineoplastic drugs.
Where U85 sits
- 1ChapterChapter 23: Provisional Codes for Research and Temporary Assignment
- 2Block U50-U99Provisional codes for research and temporary assignment in Canada
- 3Valid code U85Resistance to antineoplastic 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 U85 mean?
U85 is the ICD-10-CA code for “Resistance to antineoplastic drugs” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is U85 in ICD-10-CA?
U85 sits under 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 U85?
ICD-10-CA lists Note, Includes notes for U85, 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.