ICD-10 M71.20
Billable / SpecificSynovial cyst of popliteal space [Baker], unspecified knee
About ICD-10-CM M71.20
ICD-10-CM code M71.20 represents Synovial cyst of popliteal space [Baker], unspecified knee. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M71). The 2026 edition of ICD-10-CM M71.20 became effective on October 1, 2025.
Medicare LCD Coverage for M71.20
Local Coverage Determinations (LCDs) from CMS MACs that list M71.20 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M71.20.
1 Cigna
CPT Codes Commonly Billed with M71.20
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 20610 Joint injection major — knee OA, hip OA, shoulder OA, shoulder impingement, joint pain, meniscal derangement, synovitis, bursitis Orthopedics
Convert M71.20 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| M71.20 | 72751 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M71.20
Other codes in section M70-M79 (Other soft tissue disorders).
ICD-10 M71.20, Billing FAQ
Is ICD-10 code M71.20 billable? +
Yes, M71.20 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with M71.20? +
Procedures frequently paired with M71.20 include: 20610.
What ICD-9 codes does M71.20 map to? +
Per CMS GEMs, M71.20 maps to ICD-9 codes: 72751. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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