M18.1
Non-billableUnilateral primary osteoarth of first carpometacarp joint
Unilateral primary osteoarthritis of first carpometacarpal joint
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Primary osteoarthritis of first carpometacarpal joint NOS
Excludes 2
Conditions not included here, but the patient may have both
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- osteoarthritis of spine (M47.-)
Child Codes (3)
Also Known As / Clinical Terms
Frequently Asked Questions
What is ICD-10 code M18.1?
ICD-10-CM code M18.1 represents "Unilateral primary osteoarthritis of first carpometacarpal joint". It is a non-billable header code — use a more specific child code for billing purposes.
Is M18.1 a billable code?
No, M18.1 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 3 child codes under M18.1.
What chapter is M18.1 in?
M18.1 is in Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (codes M00-M99).
What are the subcategories under M18.1?
M18.1 has 3 child codes, including: M18.10 (Unil prim osteoarth of first carpometacarp joint, unsp hand), M18.11 (Unil primary osteoarth of first carpometacarp joint, r hand), M18.12 (Unil primary osteoarth of first carpometacarp joint, l hand).
What are the UMLS CUIs for M18.1?
M18.1 is linked to 2 UMLS Concept Unique Identifiers: C2893946, C2893947. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.