ICD-10-CM 2027
ICD-10 code for Baker's cyst
From the official ICD-10-CM alphabetic index entry “Cyst (colloid) (mucous) (simple) (retention) › Baker's”. Page updated September 29, 2026.
About coding Baker's cyst
The ICD-10-CM code for Baker's cyst is M71.2 (Synovial cyst of popliteal space [Baker]). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M71.2.
Within M71 (other bursopathies), M71.2 is specifically for Synovial cyst of popliteal space [Baker]. Related codes cover abscess of bursa (M71.0), other infective bursitis (M71.1), other bursal cyst (M71.3), calcium deposit in bursa (M71.4), other bursitis, not elsewhere classified (M71.5), other specified bursopathies (M71.8) and Bursopathy, unspecified (M71.9).
To report this condition, pick the subcode that matches the documentation: M71.20 (unspecified knee), M71.21 (right knee) and M71.22 (left knee).
Don't report M71.2 together with the conditions in its Excludes1 note: synovial cyst of popliteal space with rupture (M66.0).
More specific Baker's cyst codes (official index)
Don't confuse with (Excludes1 for M71.2)
- synovial cyst of popliteal space with rupture (M66.0)
Common questions about Baker's cyst ICD-10 codes
What is the ICD-10 code for Baker's cyst?
- M71.2 — Synovial cyst of popliteal space [Baker] (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: M66.0, A18.02.
What is the ICD-10 code for ruptured baker's cyst?
- M66.0 — Rupture of popliteal cyst.
What is the ICD-10 code for tuberculous baker's cyst?
- A18.02 — Tuberculous arthritis of other joints.
Is M71.2 billable?
- No. M71.2 is a header code. Report one of its more specific subcodes instead.