M12.20 – Villonodular synovitis (pigmented), unspecified site
ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies
ICD-10-CM code
M12.20
- Code
M12.20(claims format:M1220)- Description
- Villonodular synovitis (pigmented), unspecified site
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M05-M14 Inflammatory polyarthropathies
- Parent codes
- M12 › M12.2
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M12 – Other and unspecified arthropathy
Related codes in M12.2
- M12.21 – Villonodular synovitis (pigmented), shoulderHeader
- M12.22 – Villonodular synovitis (pigmented), elbowHeader
- M12.23 – Villonodular synovitis (pigmented), wristHeader
- M12.24 – Villonodular synovitis (pigmented), handHeader
- M12.25 – Villonodular synovitis (pigmented), hipHeader
- M12.26 – Villonodular synovitis (pigmented), kneeHeader
- M12.27 – Villonodular synovitis (pigmented), ankle and footHeader
- M12.28 – Villonodular synovitis (pigmented), other specified siteBillable
- M12.29 – Villonodular synovitis (pigmented), multiple sitesBillable
Frequently asked questions
What is ICD-10 code M12.20?
M12.20 is the ICD-10-CM code for villonodular synovitis (pigmented), unspecified site, in the block M05-M14 (Inflammatory polyarthropathies).
Is M12.20 a billable code?
Yes. M12.20 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M12.20 belong to?
It belongs to category M12 – Other and unspecified arthropathy.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.