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M17.1

⚠ Non-billable (Header)

Unilateral primary osteoarthritis of knee

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Primary osteoarthritis of knee NOS
✅ No additional coding notes for M17.1

Child Codes (3)

M17.10Unilateral primary osteoarthritis, unspecified kneeM17.11Unilateral primary osteoarthritis, right kneeM17.12Unilateral primary osteoarthritis, left knee

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Code Information

CodeM17.1
BillableNo — Header code
ParentM17
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes10 rule(s)
Excludes20 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)