ICD-10-CM diagnosis code
M1A.4611 Other secondary chronic gout, right knee, with tophus (tophi)
- Billable
- Yes, a complete code (FY2026)
- Category
- M1A
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Other codes in M1A
242 complete codes in this category.
- M1A.4511Other secondary chronic gout, right hip, with tophus (tophi)
- M1A.4520Other secondary chronic gout, left hip, without tophus (tophi)
- M1A.4521Other secondary chronic gout, left hip, with tophus (tophi)
- M1A.4590Other secondary chronic gout, unspecified hip, without tophus (tophi)
- M1A.4591Other secondary chronic gout, unspecified hip, with tophus (tophi)
- M1A.4610Other secondary chronic gout, right knee, without tophus (tophi)
- M1A.4611Other secondary chronic gout, right knee, with tophus (tophi)
- M1A.4620Other secondary chronic gout, left knee, without tophus (tophi)
- M1A.4621Other secondary chronic gout, left knee, with tophus (tophi)
- M1A.4690Other secondary chronic gout, unspecified knee, without tophus (tophi)
- M1A.4691Other secondary chronic gout, unspecified knee, with tophus (tophi)
- M1A.4710Other secondary chronic gout, right ankle and foot, without tophus (tophi)
Documentation tips
- Make sure the note supports every element of the title, “Other secondary chronic gout, right knee, with tophus (tophi)”: 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 M1A.
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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