M17.4Other bilateral secondary osteoarthritis of knee

M17.4 is the ICD-10-CM diagnosis code for other bilateral secondary osteoarthritis of knee. It belongs to category M17 (osteoarthritis of knee), block M15-M19 (osteoarthritis) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M17, choose M17.4 (Other bilateral secondary osteoarthritis of knee) only when documentation doesn't support a more specific option: bilateral primary osteoarthritis of knee (M17.0), unilateral primary osteoarthritis of knee (M17.1), bilateral post-traumatic osteoarthritis of knee (M17.2), unilateral post-traumatic osteoarthritis of knee (M17.3), other unilateral secondary osteoarthritis of knee (M17.5) and unspecified (M17.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 553 (Bone Diseases and Arthropathies with MCC, relative weight 1.2494) and DRG 554 (Bone Diseases and Arthropathies without MCC, relative weight 0.8331), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 715.26 (Osteoarthrosis, localized, secondary, lower leg).