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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M00.149|
Pneumococcal arthritis, unspecified hand
M00.15|
Pneumococcal arthritis, hip
M00.151|
Pneumococcal arthritis, right hip
M00.152|
Pneumococcal arthritis, left hip
M00.159|
Pneumococcal arthritis, unspecified hip
M00.16|
Pneumococcal arthritis, knee
M00.161|
Pneumococcal arthritis, right knee
M00.162|
Pneumococcal arthritis, left knee
M00.169|
Pneumococcal arthritis, unspecified knee
M00.17|
Pneumococcal arthritis, ankle and foot
M00.171|
Pneumococcal arthritis, right ankle and foot
M00.172|
Pneumococcal arthritis, left ankle and foot
M00.179|
Pneumococcal arthritis, unspecified ankle and foot
M00.18|
Pneumococcal arthritis, vertebrae
M00.19|
Pneumococcal polyarthritis
M00.2|
Other streptococcal arthritis and polyarthritis
M00.20|
Other streptococcal arthritis, unspecified joint
M00.21|
Other streptococcal arthritis, shoulder
M00.211|
Other streptococcal arthritis, right shoulder
M00.212|
Other streptococcal arthritis, left shoulder
M00.219|
Other streptococcal arthritis, unspecified shoulder
M00.22|
Other streptococcal arthritis, elbow
M00.221|
Other streptococcal arthritis, right elbow
M00.222|
Other streptococcal arthritis, left elbow
M00.229|
Other streptococcal arthritis, unspecified elbow
M00.23|
Other streptococcal arthritis, wrist
M00.231|
Other streptococcal arthritis, right wrist
M00.232|
Other streptococcal arthritis, left wrist
M00.239|
Other streptococcal arthritis, unspecified wrist
M00.24|
Other streptococcal arthritis, hand
M00.241|
Other streptococcal arthritis, right hand
M00.242|
Other streptococcal arthritis, left hand
M00.249|
Other streptococcal arthritis, unspecified hand
M00.25|
Other streptococcal arthritis, hip
M00.251|
Other streptococcal arthritis, right hip
M00.252|
Other streptococcal arthritis, left hip
M00.259|
Other streptococcal arthritis, unspecified hip
M00.26|
Other streptococcal arthritis, knee
M00.261|
Other streptococcal arthritis, right knee
M00.262|
Other streptococcal arthritis, left knee
M00.269|
Other streptococcal arthritis, unspecified knee
M00.27|
Other streptococcal arthritis, ankle and foot
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
M00.8|
Arthritis and polyarthritis due to other bacteria
M00.80|
Arthritis due to other bacteria, unspecified joint
M00.81|
Arthritis due to other bacteria, shoulder

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