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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M00.212|
Other streptococcal arthritis, left shoulder
M00.219|
Other streptococcal arthritis, unspecified shoulder
M00.221|
Other streptococcal arthritis, right elbow
M00.222|
Other streptococcal arthritis, left elbow
M00.229|
Other streptococcal arthritis, unspecified elbow
M00.231|
Other streptococcal arthritis, right wrist
M00.232|
Other streptococcal arthritis, left wrist
M00.239|
Other streptococcal arthritis, unspecified wrist
M00.241|
Other streptococcal arthritis, right hand
M00.242|
Other streptococcal arthritis, left hand
M00.249|
Other streptococcal arthritis, unspecified hand
M00.251|
Other streptococcal arthritis, right hip
M00.252|
Other streptococcal arthritis, left hip
M00.259|
Other streptococcal arthritis, unspecified hip
M00.261|
Other streptococcal arthritis, right knee
M00.262|
Other streptococcal arthritis, left knee
M00.269|
Other streptococcal arthritis, unspecified knee
M00.271|
Other streptococcal arthritis, right ankle and foot
M00.272|
Other streptococcal arthritis, left ankle and foot
M00.279|
Other streptococcal arthritis, unspecified ankle and foot
M00.28|
Other streptococcal arthritis, vertebrae
M00.29|
Other streptococcal polyarthritis
M00.80|
Arthritis due to other bacteria, unspecified joint
M00.811|
Arthritis due to other bacteria, right shoulder
M00.812|
Arthritis due to other bacteria, left shoulder
M00.819|
Arthritis due to other bacteria, unspecified shoulder
M00.821|
Arthritis due to other bacteria, right elbow
M00.822|
Arthritis due to other bacteria, left elbow
M00.829|
Arthritis due to other bacteria, unspecified elbow
M00.831|
Arthritis due to other bacteria, right wrist
M00.832|
Arthritis due to other bacteria, left wrist
M00.839|
Arthritis due to other bacteria, unspecified wrist
M00.841|
Arthritis due to other bacteria, right hand
M00.842|
Arthritis due to other bacteria, left hand
M00.849|
Arthritis due to other bacteria, unspecified hand
M00.851|
Arthritis due to other bacteria, right hip
M00.852|
Arthritis due to other bacteria, left hip
M00.859|
Arthritis due to other bacteria, unspecified hip
M00.861|
Arthritis due to other bacteria, right knee
M00.862|
Arthritis due to other bacteria, left knee
M00.869|
Arthritis due to other bacteria, unspecified knee
M00.871|
Arthritis due to other bacteria, right ankle and foot
M00.872|
Arthritis due to other bacteria, left ankle and foot
M00.879|
Arthritis due to other bacteria, unspecified ankle and foot
M00.88|
Arthritis due to other bacteria, vertebrae
M00.89|
Polyarthritis due to other bacteria
M00.9|
Pyogenic arthritis, unspecified
M01.X0|
Direct infection of unspecified joint in infectious and parasitic diseases classified elsewhere
M01.X11|
Direct infection of right shoulder in infectious and parasitic diseases classified elsewhere
M01.X12|
Direct infection of left shoulder in infectious and parasitic diseases classified elsewhere

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