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

Arthropathies
(M00-M25)

Disorders affecting predominantly peripheral (limb) joints

Infectious arthropathies
(M00-M03)

Note: This block comprises arthropathies due to microbiological agents.

Distinction is made between the following types of etiological relationship:
  1. direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;
  2. indirect infection, which may be of two types: a reactive arthropathy , where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy , where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking.

M00 Pyogenic arthritis
[See site code at the beginning of this chapter ]
M00.0 Staphylococcal arthritis and polyarthritis
M00.1 Pneumococcal arthritis and polyarthritis
M00.2 Other streptococcal arthritis and polyarthritis
M00.8 Arthritis and polyarthritis due to other specified bacterial agents
Use additional code (B95-B96), if desired, to identify bacterial agent.
M00.9 Pyogenic arthritis, unspecified
Infective arthritis NOS

M01* Direct infections of joint in infectious and parasitic diseases classified elsewhere
[See site code at the beginning of this chapter ]
Excludes: arthropathy in sarcoidosis ( M14.8* )
postinfective and reactive arthropathy ( M03.-* )
M01.0* Meningococcal arthritis ( A39.8+ )
Excludes: postmeningococcal arthritis ( M03.0* )
M01.1* Tuberculous arthritis ( A18.0+ )
Excludes: of spine ( M49.0* )
M01.2* Arthritis in Lyme disease ( A69.2+ )
M01.3* Arthritis in other bacterial diseases classified elsewhere
Arthritis in:
· leprosy [Hansen's disease] ( A30.-+ )
· localized salmonella infection ( A02.2+ )
· typhoid or paratyphoid fever ( A01.-+ )
Gonococcal arthritis ( A54.4+ )
M01.4* Rubella arthritis ( B06.8+ )
M01.5* Arthritis in other viral diseases classified elsewhere
Arthritis in:
· mumps ( B26.8+ )
· O'nyong-nyong fever ( A92.1+ )
M01.6* Arthritis in mycoses ( B35-B49+ )
M01.8* Arthritis in other infectious and parasitic diseases classified elsewhere

M02 Reactive arthropathies
[See site code at the beginning of this chapter ]
Excludes: Behçet's disease ( M35.2 )
rheumatic fever ( I00 )
M02.0 Arthropathy following intestinal bypass
M02.1 Postdysenteric arthropathy
M02.2 Postimmunization arthropathy
M02.3 Reiter's disease
M02.8 Other reactive arthropathies
M02.9 Reactive arthropathy, unspecified

M03* Postinfective and reactive arthropathies in diseases classified elsewhere
[See site code at the beginning of this chapter ]
Excludes: direct infections of joint in infectious and parasitic diseases classified elsewhere ( M01.-* )
M03.0* Postmeningococcal arthritis ( A39.8+ )
Excludes: meningococcal arthritis ( M01.0* )
M03.1* Postinfective arthropathy in syphilis
Clutton's joints ( A50.5+ )
Excludes: Charcot's or tabetic arthropathy ( M14.6* )
M03.2* Other postinfectious arthropathies in diseases classified elsewhere
Postinfectious arthropathy in:
· enteritis due to Yersinia enterocolitica ( A04.6+ )
· viral hepatitis ( B15-B19+ )
Excludes: viral arthropathies ( M01.4-M01.5* )
M03.6* Reactive arthropathy in other diseases classified elsewhere
Arthropathy in infective endocarditis ( I33.0+ )