M17.11: Unilateral primary osteoarthritis, right knee
Billable ICD-10-CM code, FY2027
What ICD-10-CM says
Notes at M17.1, Unilateral primary osteoarthritis of knee (they apply to every code under it)
Includes
- Primary osteoarthritis of knee NOS
What M17.11 covers
M17.11 is for primary osteoarthritis in the right knee only. Primary means no other cause, such as an old injury, is documented.
Orthopedics, rheumatology, primary care and physical therapy use it. The left knee is M17.12 and an unspecified side is M17.10. Primary osteoarthritis in both knees is M17.0. Post-traumatic and other secondary osteoarthritis of the knee have their own codes (M17.2-M17.5).
Billing and coding notes
If both knees have primary osteoarthritis, use M17.0 rather than M17.11 and M17.12 together. M17.11 is for the right knee alone.
Knee pain is part of the osteoarthritis and is not added as M25.561. After a total knee replacement, the right knee is no longer coded as osteoarthritis; a status code for the presence of the artificial knee joint (Z96.651) applies.
Related codes under M17.1
Questions about M17.11
How do you code osteoarthritis in both knees?
Use M17.0, bilateral primary osteoarthritis of knee. Do not report M17.11 and M17.12 together for the same condition.
What is the difference between M17.11 and M17.31?
M17.11 is primary osteoarthritis of the right knee. M17.31 is unilateral post-traumatic osteoarthritis of the right knee, for arthritis that follows an earlier injury.
ICD-10-CM in CloudMedico
In CloudMedico, a visit's diagnoses come from the current ICD-10-CM list. For US practices, the visit flags a code that isn't billable on its date, and a superbill made from an invoice carries the visit's diagnoses.
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