Chapter XIII
Diseases of the musculoskeletal system and connective tissue
(M00-M99)

Arthropathies
(M00-M25)

Disorders affecting predominantly peripheral (limb) joints

Arthrosis
(M15-M19)

Note: In this block the term osteoarthritis is used as a synonym for arthrosis or osteoarthrosis. The term primary has been used with its customary clinical meaning of no underlying or determining condition identified.
Excludes: osteoarthritis of spine ( M47.- )

M15 Polyarthrosis
Includes: arthrosis with mention of more than one site
Excludes: bilateral involvement of single joint ( M16-M19 )
M15.0 Primary generalized (osteo)arthrosis
M15.1 Heberden's nodes (with arthropathy)
M15.2 Bouchard's nodes (with arthropathy)
M15.3 Secondary multiple arthrosis
Post-traumatic polyarthrosis
M15.4 Erosive (osteo)arthrosis
M15.8 Other polyarthrosis
M15.9 Polyarthrosis, unspecified
Generalized osteoarthritis NOS

M16 Coxarthrosis [arthrosis of hip]
M16.0 Primary coxarthrosis, bilateral
M16.1 Other primary coxarthrosis
Primary coxarthrosis:
· NOS
· unilateral
M16.2 Coxarthrosis resulting from dysplasia, bilateral
M16.3 Other dysplastic coxarthrosis
Dysplastic coxarthrosis:
· NOS
· unilateral
M16.4 Post-traumatic coxarthrosis, bilateral
M16.5 Other post-traumatic coxarthrosis
Post-traumatic coxarthrosis:
· NOS
· unilateral
M16.6 Other secondary coxarthrosis, bilateral
M16.7 Other secondary coxarthrosis
Secondary coxarthrosis:
· NOS
· unilateral
M16.9 Coxarthrosis, unspecified

M17 Gonarthrosis [arthrosis of knee]
M17.0 Primary gonarthrosis, bilateral
M17.1 Other primary gonarthrosis
Primary gonarthrosis:
· NOS
· unilateral
M17.2 Post-traumatic gonarthrosis, bilateral
M17.3 Other post-traumatic gonarthrosis
Post-traumatic gonarthrosis:
· NOS
· unilateral
M17.4 Other secondary gonarthrosis, bilateral
M17.5 Other secondary gonarthrosis
Secondary gonarthrosis:
· NOS
· unilateral
M17.9 Gonarthrosis, unspecified

M18 Arthrosis of first carpometacarpal joint
M18.0 Primary arthrosis of first carpometacarpal joints, bilateral
M18.1 Other primary arthrosis of first carpometacarpal joint
Primary arthrosis of first carpometacarpal joint:
· NOS
· unilateral
M18.2 Post-traumatic arthrosis of first carpometacarpal joints, bilateral
M18.3 Other post-traumatic arthrosis of first carpometacarpal joint
Post-traumatic arthrosis of first carpometacarpal joint:
· NOS
· unilateral
M18.4 Other secondary arthrosis of first carpometacarpal joints, bilateral
M18.5 Other secondary arthrosis of first carpometacarpal joint
Secondary arthrosis of first carpometacarpal joint:
· NOS
· unilateral
M18.9 Arthrosis of first carpometacarpal joint, unspecified

M19 Other arthrosis
[See site code at the beginning of this chapter ]
Excludes: arthrosis of spine ( M47.- )
hallux rigidus ( M20.2 )
polyarthrosis ( M15.- )
M19.0 Primary arthrosis of other joints
Primary arthrosis NOS
M19.1 Post-traumatic arthrosis of other joints
Post-traumatic arthrosis NOS
M19.2 Other secondary arthrosis
Secondary arthrosis NOS
M19.8 Other specified arthrosis
M19.9 Arthrosis, unspecified