Billable FY2026 ICD-10-CM diagnosis code, knee region. What it covers, how to bill it cleanly, and what these patients sound like when they call.
The workhorse diagnosis of knee replacement pipelines: primary osteoarthritis limited to the right knee. Primary means degenerative wear without a specific traumatic or secondary cause; unilateral plus laterality is exactly the specificity payers want to see. When both knees are involved, M17.0 is the correct code rather than 2 unilateral codes.
| Code | Description |
|---|---|
| M17.10 | Unilateral primary osteoarthritis, unspecified knee |
| M17.12 | Unilateral primary osteoarthritis, left knee |
| M17.0 | Bilateral primary osteoarthritis of knee |
| M17.2 | Bilateral post-traumatic osteoarthritis of knee |
| M17.30 | Unilateral post-traumatic osteoarthritis, unspecified knee |
| M17.31 | Unilateral post-traumatic osteoarthritis, right knee |
Callers with knee osteoarthritis describe years of grinding pain, stairs becoming the enemy, and a bad week that finally made them call. Scheduling-wise they belong with the joint replacement team, and capturing which knee during intake keeps the chart, the imaging order, and eventually the consent form on the same side.
ClinicFlow's voice AI runs this intake on every call for joint replacement practices: capturing the story, applying your routing rules, and booking the right visit type with the right surgeon. See voice AI for joint replacement practices or the Call Library for how each call type is handled.
M17.11 is the FY2026 ICD-10-CM code for unilateral primary osteoarthritis, right knee. The workhorse diagnosis of knee replacement pipelines: primary osteoarthritis limited to the right knee.
M17.0 covers bilateral primary knee osteoarthritis. Use it when both knees are affected rather than coding 2 unilateral codes.
Yes. M17.11 appears in the official FY2026 ICD-10-CM code set (effective October 1, 2025). ICD-10-CM is public-domain CMS data; verify annually as codes are revised each fiscal year.
ClinicFlow answers all of them, 24/7, and books them with the right surgeon.
