M12.40 – Intermittent hydrarthrosis, unspecified site
ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies
ICD-10-CM code
M12.40
- Code
M12.40(claims format:M1240)- Description
- Intermittent hydrarthrosis, 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 › M12.4
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M12 – Other and unspecified arthropathy
Index terms for M12.40
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in M12.4
- M12.41 – Intermittent hydrarthrosis, shoulderHeader
- M12.42 – Intermittent hydrarthrosis, elbowHeader
- M12.43 – Intermittent hydrarthrosis, wristHeader
- M12.44 – Intermittent hydrarthrosis, handHeader
- M12.45 – Intermittent hydrarthrosis, hipHeader
- M12.46 – Intermittent hydrarthrosis, kneeHeader
- M12.47 – Intermittent hydrarthrosis, ankle and footHeader
- M12.48 – Intermittent hydrarthrosis, other siteBillable
- M12.49 – Intermittent hydrarthrosis, multiple sitesBillable
Frequently asked questions
What is ICD-10 code M12.40?
M12.40 is the ICD-10-CM code for intermittent hydrarthrosis, unspecified site, in the block M05-M14 (Inflammatory polyarthropathies).
Is M12.40 a billable code?
Yes. M12.40 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does M12.40 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.