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

Note:
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Excludes 2:
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)

Inflammatory polyarthropathies (M05-M14)

M05 Rheumatoid arthritis with rheumatoid factor [+]
Excludes 1: rheumatic fever (I00)
juvenile rheumatoid arthritis (M08.-)
rheumatoid arthritis of spine (M45.-)
M06 Other rheumatoid arthritis [+]
M07 Enteropathic arthropathies [+]
Code also associated enteropathy, such as:
regional enteritis [Crohn's disease] (K50.-)
ulcerative colitis (K51.-)
Excludes 1: psoriatic arthropathies (L40.5-)
M08 Juvenile arthritis [+]
Code also any associated underlying condition, such as:
regional enteritis [Crohn's disease] (K50.-)
ulcerative colitis (K51.-)
Excludes 1: arthropathy in Whipple's disease (M14.8)
Felty's syndrome (M05.0)
juvenile dermatomyositis (M33.0-)
psoriatic juvenile arthropathy (L40.54)
M1A Chronic gout [+]
Use additional code to identify:
Use additional Autonomic neuropathy in diseases classified elsewhere (G99.0)
Use additional Calculus of urinary tract in diseases classified elsewhere (N22)
Use additional Cardiomyopathy in diseases classified elsewhere (I43)
Use additional Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-)
Use additional Disorders of iris and ciliary body in diseases classified elsewhere (H22)
Use additional Glomerular disorders in diseases classified elsewhere (N08)
Excludes 1: gout NOS (M10.-)
Excludes 2: acute gout (M10.-)
The appropriate 7th character is to be added to each code from category M1A
0 - without tophus (tophi)
1 - with tophus (tophi)
M10 Gout [+]
Acute gout
Gout attack
Gout flare
Podagra
Use additional code to identify:
Use additional Autonomic neuropathy in diseases classified elsewhere (G99.0)
Use additional Calculus of urinary tract in diseases classified elsewhere (N22)
Use additional Cardiomyopathy in diseases classified elsewhere (I43)
Use additional Disorders of external ear in diseases classified elsewhere (H61.1-, H62.8-)
Use additional Disorders of iris and ciliary body in diseases classified elsewhere (H22)
Use additional Glomerular disorders in diseases classified elsewhere (N08)
Excludes 2: chronic gout (M1A.-)
M11 Other crystal arthropathies [+]
M12 Other and unspecified arthropathy [+]
Excludes 1: arthrosis (M15-M19)
cricoarytenoid arthropathy (J38.7)
M13 Other arthritis [+]
Excludes 1: arthrosis (M15-M19)
osteoarthritis (M15-M19)
M14 Arthropathies in other diseases classified elsewhere [+]
Excludes 1: arthropathy in:
diabetes mellitus (E08-E13 with .61-)
hematological disorders (M36.2-M36.3)
hypersensitivity reactions (M36.4)
neoplastic disease (M36.1)
neurosyphillis (A52.16)
sarcoidosis (D86.86)
enteropathic arthropathies (M07.-)
juvenile psoriatic arthropathy (L40.54)
lipoid dermatoarthritis (E78.81)

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