Chapter 13

M00–M99: Diseases of the Musculoskeletal System and Connective Tissue

Diseases of the Musculoskeletal System and Connective Tissue diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)

arthropathic psoriasis (L40.5-)
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
compartment syndrome (traumatic) (T79.A-)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

All Codes Billable Only

Internal Codes

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M24.521—
Contracture, right elbow
M24.522—
Contracture, left elbow
M24.529—
Contracture, unspecified elbow
M24.53—
Contracture, wrist
M24.531—
Contracture, right wrist
M24.532—
Contracture, left wrist
M24.539—
Contracture, unspecified wrist
M24.54—
Contracture, hand
M24.541—
Contracture, right hand
M24.542—
Contracture, left hand
M24.549—
Contracture, unspecified hand
M24.55—
Contracture, hip
M24.551—
Contracture, right hip
M24.552—
Contracture, left hip
M24.559—
Contracture, unspecified hip
M24.56—
Contracture, knee
M24.561—
Contracture, right knee
M24.562—
Contracture, left knee
M24.569—
Contracture, unspecified knee
M24.57—
Contracture, ankle and foot
M24.571—
Contracture, right ankle
M24.572—
Contracture, left ankle
M24.573—
Contracture, unspecified ankle
M24.574—
Contracture, right foot
M24.575—
Contracture, left foot
M24.576—
Contracture, unspecified foot
M24.59—
Contracture, other specified joint
M24.6—
Ankylosis of joint
M24.60—
Ankylosis, unspecified joint
M24.61—
Ankylosis, shoulder
M24.611—
Ankylosis, right shoulder
M24.612—
Ankylosis, left shoulder
M24.619—
Ankylosis, unspecified shoulder
M24.62—
Ankylosis, elbow
M24.621—
Ankylosis, right elbow
M24.622—
Ankylosis, left elbow
M24.629—
Ankylosis, unspecified elbow
M24.63—
Ankylosis, wrist
M24.631—
Ankylosis, right wrist
M24.632—
Ankylosis, left wrist
M24.639—
Ankylosis, unspecified wrist
M24.64—
Ankylosis, hand
M24.641—
Ankylosis, right hand
M24.642—
Ankylosis, left hand
M24.649—
Ankylosis, unspecified hand
M24.65—
Ankylosis, hip
M24.651—
Ankylosis, right hip
M24.652—
Ankylosis, left hip
M24.659—
Ankylosis, unspecified hip
M24.66—
Ankylosis, knee

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