Unilateral primary osteoarthritis of first carpometacarpal joint
Non-billable header
M18.1 is a non-billable header code. Use one of the more specific codes below.
Inclusion terms
Applicable to
- Primary osteoarthritis of first carpometacarpal joint NOS
Includes (from M18)
- Note: Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Excludes2
Not included here — may be reported together when both conditions exist.
- arthropathic psoriasis (L40.5-) (from M18)
- certain conditions originating in the perinatal period (P04-P96) (from M18)
- certain infectious and parasitic diseases (A00-B99) (from M18)
- compartment syndrome (traumatic) (T79.A-) (from M18)
- complications of pregnancy, childbirth and the puerperium (O00-O9A) (from M18)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from M18)
- endocrine, nutritional and metabolic diseases (E00-E88) (from M18)
- injury, poisoning and certain other consequences of external causes (S00-T88) (from M18)
- neoplasms (C00-D49) (from M18)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from M18)
- osteoarthritis of spine (M47.-) (from M18)
Also known as
- Primary osteoarthritis of first carpometacarpal joint NOS
- Osteoarthritis, primary, hand joint, first carpometacarpal joint
Parent code
- M18Osteoarthritis of first carpometacarpal jointHeader
More specific codes M18.1
Related codes
- M18.0Bilateral primary osteoarthritis of first carpometacarpal jointsBillable
- M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal jointsBillable
- M18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal jointHeader
- M18.4Other bilateral secondary osteoarthritis of first carpometacarpal jointsBillable
- M18.5Other unilateral secondary osteoarthritis of first carpometacarpal jointHeader
- M18.9Osteoarthritis of first carpometacarpal joint, unspecifiedBillable