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

Soft tissue disorders
(M60-M79)

Disorders of synovium and tendon
(M65-M68)

M65 Synovitis and tenosynovitis

Excl.:
chronic crepitant synovitis of hand and wrist ( M70.0)
current injury - see injury of ligament or tendon by body region
soft tissue disorders related to use, overuse and pressure ( M70.-)
M65.0 Abscess of tendon sheath
Coding-Hint
Use additional code (B95-B96), if desired, to identify bacterial agent.
M65.1 Other infective (teno)synovitis
M65.2 Calcific tendinitis
Excl.:
of shoulder ( M75.3)
specified tendinitis ( M75-M77)
M65.3 Trigger finger
Incl.:
Nodular tendinous disease
M65.4 Radial styloid tenosynovitis [de Quervain]
M65.8 Other synovitis and tenosynovitis
Incl.:
Irritable hip
M65.9 Synovitis and tenosynovitis, unspecified

M66 Spontaneous rupture of synovium and tendon

Incl.:
rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Excl.:
rotator cuff syndrome ( M75.1)
rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
M66.0 Rupture of popliteal cyst
M66.1 Rupture of synovium
Incl.:
Rupture of synovial cyst
Excl.:
rupture of popliteal cyst ( M66.0)
M66.2 Spontaneous rupture of extensor tendons
M66.3 Spontaneous rupture of flexor tendons
M66.4 Spontaneous rupture of other tendons
M66.5 Spontaneous rupture of unspecified tendon
Incl.:
Rupture at musculotendinous junction, nontraumatic

M67 Other disorders of synovium and tendon

Excl.:
palmar fascial fibromatosis [Dupuytren] ( M72.0)
tendinitis NOS ( M77.9)
xanthomatosis localized to tendons ( E78.2)
M67.0 Short Achilles tendon (acquired)
M67.1 Other contracture of tendon (sheath)
Excl.:
with contracture of joint ( M24.5)
M67.2 Synovial hypertrophy, not elsewhere classified
Excl.:
villonodular synovitis (pigmented) ( M12.2)
M67.3 Transient synovitis
Incl.:
Toxic synovitis
Excl.:
palindromic rheumatism ( M12.3)
M67.4 Ganglion
Incl.:
Ganglion of joint or tendon (sheath)
Excl.:
cyst of:
ganglion in yaws ( A66.6)
M67.8 Other specified disorders of synovium and tendon
M67.9 Disorder of synovium and tendon, unspecified

M68* Disorders of synovium and tendon in diseases classified elsewhere

M68.0* Synovitis and tenosynovitis in bacterial diseases classified elsewhere
Incl.:
Synovitis or tenosynovitis in:
M68.8* Other disorders of synovium and tendon in diseases classified elsewhere