M71 - Other bursopathies
M71.2 - Synovial cyst of popliteal space [Baker]
Excludes 1:
-synovial cyst of popliteal space with rupture M66.0)
M71.20 - Synovial cyst of popliteal space [Baker], unspecified knee
M71.21 - Synovial cyst of popliteal space [Baker], right knee
M71.22 - Synovial cyst of popliteal space [Baker], left knee