M12.4 – Intermittent hydrarthrosis
ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies
ICD-10-CM code
M12.4
- Code
M12.4(claims format:M124)- Description
- Intermittent hydrarthrosis
- Billable
- No – use a more specific code below
- 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
Billable codes under M12.4
M12.4 is a header code and cannot be used on claims. Choose the most specific code:
- M12.40 – Intermittent hydrarthrosis, unspecified siteBillable
- M12.41 – Intermittent hydrarthrosis, shoulderHeader (more codes below)
- M12.42 – Intermittent hydrarthrosis, elbowHeader (more codes below)
- M12.43 – Intermittent hydrarthrosis, wristHeader (more codes below)
- M12.44 – Intermittent hydrarthrosis, handHeader (more codes below)
- M12.45 – Intermittent hydrarthrosis, hipHeader (more codes below)
- M12.46 – Intermittent hydrarthrosis, kneeHeader (more codes below)
- M12.47 – Intermittent hydrarthrosis, ankle and footHeader (more codes below)
- M12.48 – Intermittent hydrarthrosis, other siteBillable
- M12.49 – Intermittent hydrarthrosis, multiple sitesBillable
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
- M12.0 – Chronic postrheumatic arthropathy [Jaccoud]Header
- M12.1 – Kaschin-Beck diseaseHeader
- M12.2 – Villonodular synovitis (pigmented)Header
- M12.3 – Palindromic rheumatismHeader
- M12.5 – Traumatic arthropathyHeader
- M12.8 – Other specific arthropathies, not elsewhere classifiedHeader
- M12.9 – Arthropathy, unspecifiedBillable
Frequently asked questions
What is ICD-10 code M12.4?
M12.4 is the ICD-10-CM code for intermittent hydrarthrosis, in the block M05-M14 (Inflammatory polyarthropathies).
Is M12.4 a billable code?
No. M12.4 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M12.4 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.