ICD-10-CM diagnosis code
M99.46 Connective tissue stenosis of neural canal of lower extremity
- Billable
- Yes, a complete code (FY2026)
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Other codes in M99
91 complete codes in this category.
- M99.40Connective tissue stenosis of neural canal of head region
- M99.41Connective tissue stenosis of neural canal of cervical region
- M99.42Connective tissue stenosis of neural canal of thoracic region
- M99.43Connective tissue stenosis of neural canal of lumbar region
- M99.44Connective tissue stenosis of neural canal of sacral region
- M99.45Connective tissue stenosis of neural canal of pelvic region
- M99.46Connective tissue stenosis of neural canal of lower extremity
- M99.47Connective tissue stenosis of neural canal of upper extremity
- M99.48Connective tissue stenosis of neural canal of rib cage
- M99.49Connective tissue stenosis of neural canal of abdomen and other regions
- M99.50Intervertebral disc stenosis of neural canal of head region
- M99.51Intervertebral disc stenosis of neural canal of cervical region
Documentation tips
- Make sure the note supports every element of the title, “Connective tissue stenosis of neural canal of lower extremity”: 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 M99.
The international WHO ICD-10 also has M99, 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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