M25.66

M25.66: Stiffness of knee, not elsewhere classified

Non-billable headerICD-10-CM

M25.66 is a non-billable header ICD-10-CM code for stiffness of knee, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above M25.66

A category’s note binds every code beneath it.

Written on M25.6: Stiffness of joint, not elsewhere classified

ankylosis of joint (M24.6-)
contracture of joint (M24.5-)

Excludes2 inherited from the categories above M25.66

Not part of this code, but both may be coded when both are present.

Written on M25: Other joint disorder, not elsewhere classified

abnormality of gait and mobility (R26.-)
acquired deformities of limb (M20-M21)
calcification of bursa (M71.4-)
calcification of shoulder (joint) (M75.3)
calcification of tendon (M65.2-)
difficulty in walking (R26.2)
temporomandibular joint disorder (M26.6-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead M25.66

3 child codes. Green means billable.