M12.4
Intermittent hydrarthrosis
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 12 never code together
M00-M99chapter
Excludes2
- arthropathic psoriasis (L40.5-)L40.5-
- certain conditions originating in the perinatal period (P04-P96)P04-P96
- certain infectious and parasitic diseases (A00-B99)A00-B99
- compartment syndrome (traumatic) (T79.A-)T79.A-
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 2
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 7 same parent — M12
M12.0 Chronic postrheumatic arthropathy [Jaccoud] category M12.1 Kaschin-Beck disease category M12.2 Villonodular synovitis (pigmented) category M12.3 Palindromic rheumatism category M12.5 Traumatic arthropathy category M12.8 Other specific arthropathies, not elsewhere classified category M12.9 Arthropathy, unspecified
Subordinate codes 10
M12.40 Intermittent hydrarthrosis, unspecified site M12.41 Intermittent hydrarthrosis, shoulder M12.42 Intermittent hydrarthrosis, elbow M12.43 Intermittent hydrarthrosis, wrist M12.44 Intermittent hydrarthrosis, hand M12.45 Intermittent hydrarthrosis, hip M12.46 Intermittent hydrarthrosis, knee M12.47 Intermittent hydrarthrosis, ankle and foot M12.48 Intermittent hydrarthrosis, other site M12.49 Intermittent hydrarthrosis, multiple sites
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.