ICD-10-CM 2027
ICD-10 code for Arthrosis
From the official ICD-10-CM alphabetic index entry “Arthrosis (deformans) (degenerative) (localized)”. Page updated September 29, 2026.
About coding Arthrosis
The ICD-10-CM code for Arthrosis is M19.90 (Unspecified osteoarthritis, unspecified site).
Within M19.9, choose M19.90 (Unspecified osteoarthritis, unspecified site) only when documentation doesn't support a more specific option: primary osteoarthritis, unspecified site (M19.91), post-traumatic osteoarthritis, unspecified site (M19.92) and secondary osteoarthritis, unspecified site (M19.93).
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.
More specific Arthrosis codes (official index)
- spine
Common questions about Arthrosis ICD-10 codes
What is the ICD-10 code for Arthrosis?
- M19.90 — Unspecified osteoarthritis, unspecified site.
Is M19.90 billable?
- Yes. M19.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M19.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M19.90 as a principal diagnosis.
Is M19.90 a CC or MCC?
- No. M19.90 is neither a CC nor an MCC under MS-DRG v44.0.