ICD-10-CM > M00-M99 > M70-M79 > M71 > M71.2 M71.2 Synovial cyst of popliteal space [Baker] Non-Billable/Non-Specific Type 1 Excludes synovial cyst of popliteal space with rupture (M66.0) Codes M71.20Synovial cyst of popliteal space [Baker], unspecified kneeM71.21Synovial cyst of popliteal space [Baker], right kneeM71.22Synovial cyst of popliteal space [Baker], left knee