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

Arthropathies
(M00-M25)

Disorders affecting predominantly peripheral (limb) joints

Inflammatory polyarthropathies
(M05-M14)

M05 Seropositive rheumatoid arthritis
[See site code at the beginning of this chapter ]
Excludes: rheumatic fever ( I00 )
rheumatoid arthritis (of):
· juvenile ( M08.- )
· spine ( M45 )
M05.0 Felty's syndrome
Rheumatoid arthritis with splenoadenomegaly and leukopenia
M05.1+ Rheumatoid lung disease ( J99.0* )
M05.2 Rheumatoid vasculitis
M05.3+ Rheumatoid arthritis with involvement of other organs and systems
Rheumatoid:
· carditis ( I52.8* )
· endocarditis ( I39.-* )
· myocarditis ( I41.8* )
· myopathy ( G73.7* )
· pericarditis ( I32.8* )
· polyneuropathy ( G63.6* )
M05.8 Other seropositive rheumatoid arthritis
M05.9 Seropositive rheumatoid arthritis, unspecified

M06 Other rheumatoid arthritis
[See site code at the beginning of this chapter ]
M06.0 Seronegative rheumatoid arthritis
M06.1 Adult-onset Still's disease
Excludes: Still's disease NOS ( M08.2 )
M06.2 Rheumatoid bursitis
M06.3 Rheumatoid nodule
M06.4 Inflammatory polyarthropathy
Excludes: polyarthritis NOS ( M13.0 )
M06.8 Other specified rheumatoid arthritis
M06.9 Rheumatoid arthritis, unspecified

M07* Psoriatic and enteropathic arthropathies
[See site code at the beginning of this chapter ]
Excludes: juvenile psoriatic and enteropathic arthropathies ( M09.-* )
M07.0* Distal interphalangeal psoriatic arthropathy ( L40.5+ )
M07.1* Arthritis mutilans ( L40.5+ )
M07.2* Psoriatic spondylitis ( L40.5+ )
M07.3* Other psoriatic arthropathies ( L40.5+ )
M07.4* Arthropathy in Crohn's disease [regional enteritis] ( K50.-+ )
M07.5* Arthropathy in ulcerative colitis ( K51.-+ )
M07.6* Other enteropathic arthropathies

M08 Juvenile arthritis
[See site code at the beginning of this chapter ]
Includes: arthritis in children, with onset before 16th birthday and lasting longer than 3 months
Excludes: Felty's syndrome ( M05.0 )
juvenile dermatomyositis ( M33.0 )
M08.0 Juvenile rheumatoid arthritis
Juvenile rheumatoid arthritis with or without rheumatoid factor
M08.1 Juvenile ankylosing spondylitis
Excludes: ankylosing spondylitis in adults ( M45 )
M08.2 Juvenile arthritis with systemic onset
Still's disease NOS
Excludes: adult-onset Still's disease ( M06.1 )
M08.3 Juvenile polyarthritis (seronegative)
Chronic juvenile polyarthritis
M08.4 Pauciarticular juvenile arthritis
M08.8 Other juvenile arthritis
M08.9 Juvenile arthritis, unspecified

M09* Juvenile arthritis in diseases classified elsewhere
[See site code at the beginning of this chapter ]
Excludes: arthropathy in Whipple's disease ( M14.8* )
M09.0* Juvenile arthritis in psoriasis ( L40.5+ )
M09.1* Juvenile arthritis in Crohn's disease [regional enteritis] ( K50.-+ )
M09.2* Juvenile arthritis in ulcerative colitis ( K51.-+ )
M09.8* Juvenile arthritis in other diseases classified elsewhere

M10 Gout
[See site code at the beginning of this chapter ]
M10.0 Idiopathic gout
Gouty bursitis
Primary gout
Urate tophus of heart+ ( I43.8* )
M10.1 Lead-induced gout
M10.2 Drug-induced gout
Use additional external cause code (Chapter XX), if desired, to identify drug.
M10.3 Gout due to impairment of renal function
M10.4 Other secondary gout
M10.9 Gout, unspecified

M11 Other crystal arthropathies
[See site code at the beginning of this chapter ]
M11.0 Hydroxyapatite deposition disease
M11.1 Familial chondrocalcinosis
M11.2 Other chondrocalcinosis
Chondrocalcinosis NOS
M11.8 Other specified crystal arthropathies
M11.9 Crystal arthropathy, unspecified

M12 Other specific arthropathies
[See site code at the beginning of this chapter ]
Excludes: arthropathy NOS ( M13.9 )
arthrosis ( M15-M19 )
cricoarytenoid arthropathy ( J38.7 )
M12.0 Chronic postrheumatic arthropathy [Jaccoud]
M12.1 Kaschin-Beck disease
M12.2 Villonodular synovitis (pigmented)
M12.3 Palindromic rheumatism
M12.4 Intermittent hydrarthrosis
M12.5 Traumatic arthropathy
Excludes: post-traumatic arthrosis (of):
· NOS ( M19.1 )
· first carpometacarpal joint ( M18.2-M18.3 )
· hip ( M16.4-M16.5 )
· knee ( M17.2-M17.3 )
· other single joints ( M19.1 )
M12.8 Other specific arthropathies, not elsewhere classified
Transient arthropathy

M13 Other arthritis
[See site code at the beginning of this chapter]
Excludes: arthrosis ( M15-M19 )
M13.0 Polyarthritis, unspecified
M13.1 Monoarthritis, not elsewhere classified
M13.8 Other specified arthritis
Allergic arthritis
M13.9 Arthritis, unspecified
Arthropathy NOS

M14* Arthropathies in other diseases classified elsewhere
Excludes: arthropathy in:
· haematological disorders ( M36.2-M36.3* )
· hypersensitivity reactions ( M36.4* )
· neoplastic disease ( M36.1* )
neuropathic spondylopathy ( M49.4* )
psoriatic and enteropathic arthropathies ( M07.-* )
· juvenile ( M09.-* )
M14.0* Gouty arthropathy due to enzyme defects and other inherited disorders
Gouty arthropathy in:
· Lesch-Nyhan syndrome ( E79.1+ )
· sickle-cell disorders ( D57.-+ )
M14.1* Crystal arthropathy in other metabolic disorders
Crystal arthropathy in hyperparathyroidism ( E21.-+ )
M14.2* Diabetic arthropathy ( E10-E14+ with common fourth character .6)
Excludes: diabetic neuropathic arthropathy ( M14.6* )
M14.3* Lipoid dermatoarthritis ( E78.8+ )
M14.4* Arthropathy in amyloidosis ( E85.-+ )
M14.5* Arthropathies in other endocrine, nutritional and metabolic disorders
Arthropathy in:
· acromegaly and pituitary gigantism ( E22.0+ )
· haemochromatosis ( E83.1+ )
· hypothyroidism ( E00-E03+ )
· thyrotoxicosis [hyperthyroidism] ( E05.-+ )
M14.6* Neuropathic arthropathy
Charcot's or tabetic arthropathy ( A52.1+ )
Diabetic neuropathic arthropathy ( E10-E14+ with common fourth character .6)
M14.8* Arthropathies in other specified diseases classified elsewhere
Arthropathy in:
· erythema:
  · multiforme ( L51.-+ )
  · nodosum ( L52+ )
· sarcoidosis ( D86.8+ )
· Whipple's disease ( K90.8+ )