ICD-10-CM
ICD-10 code for Knee osteoarthritis: M17.9
The CDC title for "Knee osteoarthritis" is M17 (Osteoarthritis of knee), a header that is not billable. When nothing more specific is documented, the billable code is M17.9, Osteoarthritis of knee, unspecified.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under M17, then other CDC titles that name osteoarthritis of knee
A header groups codes and is not billed. A billable code is one you can report.
- M17Osteoarthritis of kneeHeader
- M17.0Bilateral primary osteoarthritis of kneeBillable
- M17.1Unilateral primary osteoarthritis of kneeHeader
- M17.10Unilateral primary osteoarthritis, unspecified kneeBillable
- M17.11Unilateral primary osteoarthritis, right kneeBillable
- M17.12Unilateral primary osteoarthritis, left kneeBillable
- M17.2Bilateral post-traumatic osteoarthritis of kneeBillable
- M17.3Unilateral post-traumatic osteoarthritis of kneeHeader
- M17.30Unilateral post-traumatic osteoarthritis, unspecified kneeBillable
- M17.31Unilateral post-traumatic osteoarthritis, right kneeBillable
- M17.32Unilateral post-traumatic osteoarthritis, left kneeBillable
- M17.4Other bilateral secondary osteoarthritis of kneeBillable
- M17.5Other unilateral secondary osteoarthritis of kneeBillable
- M17.9Osteoarthritis of knee, unspecifiedBillable
Related conditions
Related pages
- M17.9 code detailsNotes, nearby codes, CMS-HCC group
- Category M17Every code under it
- Chapter 13Diseases of the musculoskeletal system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Knee osteoarthritis?
The CDC title for "Knee osteoarthritis" is M17 (Osteoarthritis of knee), a header that is not billable. When nothing more specific is documented, the billable code is M17.9, Osteoarthritis of knee, unspecified.
Is M17.9 billable?
Yes. M17.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What chapter is M17.9 in?
Chapter 13. Diseases of the musculoskeletal system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.