M66.0 Rupture of popliteal cyst

Billable ICD-10-CM code, FY2026.

Applies from M66 Spontaneous rupture of synovium and tendon

Includes

• rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength

Excludes2 (not included here)

• rotator cuff syndrome (M75.1-)
• rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region

MS-DRG index

Defines the logic of DRG(s) 557-558 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 727.51 Synovial cyst of popliteal space (approximate)
• 727.59 Other rupture of synovium (approximate)

Code annotations containing back-references to M66.0

Back-references to M66.0

• Type 2 Excludes: M66.1 Rupture of synovium ("rupture of popliteal cyst (M66.0)")
• Type 1 Excludes: M71.2 Synovial cyst of popliteal space [Baker] ("synovial cyst of popliteal space with rupture (M66.0)")

Back-references to M66

• Type 2 Excludes: M62.1 Other rupture of muscle (nontraumatic) ("rupture of tendon (M66.-)")

Diagnosis Index entries for M66.0

• Cyst (colloid) (mucous) (simple) (retention) › Baker's › ruptured

Nearby codes

• M66 Spontaneous rupture of synovium and tendon
• M66.0 Rupture of popliteal cyst (this code)
• M66.1 Rupture of synovium
• M66.10 Rupture of synovium, unspecified joint
• M66.11 Rupture of synovium, shoulder
• M66.111 Rupture of synovium, right shoulder
• M66.112 Rupture of synovium, left shoulder