ICD-10 M17.9
Billable / SpecificOsteoarthritis of knee, unspecified
About ICD-10-CM M17.9
ICD-10-CM code M17.9 represents Osteoarthritis of knee, unspecified. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M17). The 2026 edition of ICD-10-CM M17.9 became effective on October 1, 2025.
Medicare LCD Coverage for M17.9
Local Coverage Determinations (LCDs) from CMS MACs that list M17.9 as a covered diagnosis.
Showing top 10 of 233 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M17.9.
2 Cigna
5 Medicare
5 Aetna
CPT Codes Commonly Billed with M17.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 27447 Total knee arthroplasty — primary knee OA unilateral/bilateral, post-traumatic OA, osteonecrosis Orthopedics
Convert M17.9 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| M17.9 | 71536 | 10000 |
| M17.9 | 71596 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M17.9
Other codes in section M15-M19 (Osteoarthritis).
ICD-10 M17.9, Billing FAQ
Is ICD-10 code M17.9 billable? +
Yes, M17.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with M17.9? +
Procedures frequently paired with M17.9 include: 27447.
What ICD-9 codes does M17.9 map to? +
Per CMS GEMs, M17.9 maps to ICD-9 codes: 71536, 71596. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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