M18.51
✓ Billable
Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand
ICD-10-CM · FY2026 · Diseases of the Musculoskeletal System and Connective Tissue
Code
M18.51
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Musculoskeletal System and Connective Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code M18.51?
ICD-10-CM code M18.51 represents Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand. It is a billable diagnosis code in the Diseases of the Musculoskeletal System and Connective Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is M18.51 billable?
Yes. M18.51 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is M18.51 in?
M18.51 belongs to the Diseases of the Musculoskeletal System and Connective Tissue chapter (M00–M99) of ICD-10-CM.
Related codes in the M18 category
M18
Osteoarthritis of first carpometacarpal joint
Non-billable
M18.0
Bilateral primary osteoarthritis of first carpometacarpal joints
Billable
M18.1
Unilateral primary osteoarthritis of first carpometacarpal joint
Non-billable
M18.2
Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
Billable
M18.3
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
Non-billable
M18.4
Other bilateral secondary osteoarthritis of first carpometacarpal joints
Billable
M18.5
Other unilateral secondary osteoarthritis of first carpometacarpal joint
Non-billable
M18.9
Osteoarthritis of first carpometacarpal joint, unspecified
Billable
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