M18.0
BillableBilateral primary osteoarthritis of first carpometacarpal joints
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Primary osteoarthritis affecting the base of the thumb joint on both hands, causing wear and tear of the cartilage.
Coding Tips
- •This code represents bilateral involvement; do not add additional laterality modifiers
- •Primary osteoarthritis means no secondary cause; verify no trauma or underlying condition is documented
Code Hierarchy
└M18Osteoarthritis of first carpometacarpal joint└M18.0Bilateral primary osteoarthritis of first carpometacarpal joints
└M18.0Bilateral primary osteoarthritis of first carpometacarpal joints