ICD-10-CM diagnosis code
M12.471 Intermittent hydrarthrosis, right ankle and foot
- Billable
- Yes, a complete code (FY2026)
- Category
- M12 Other specific arthropathies
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Other codes in M12
169 complete codes in this category.
- M12.451Intermittent hydrarthrosis, right hip
- M12.452Intermittent hydrarthrosis, left hip
- M12.459Intermittent hydrarthrosis, unspecified hip
- M12.461Intermittent hydrarthrosis, right knee
- M12.462Intermittent hydrarthrosis, left knee
- M12.469Intermittent hydrarthrosis, unspecified knee
- M12.471Intermittent hydrarthrosis, right ankle and foot
- M12.472Intermittent hydrarthrosis, left ankle and foot
- M12.479Intermittent hydrarthrosis, unspecified ankle and foot
- M12.48Intermittent hydrarthrosis, other site
- M12.49Intermittent hydrarthrosis, multiple sites
- M12.50Traumatic arthropathy, unspecified site
Documentation tips
- Make sure the note supports every element of the title, “Intermittent hydrarthrosis, right ankle and foot”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M12.
The international WHO ICD-10 also has M12, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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