All ICD10 Codes

M18

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Osteoarthritis of first carpometacarpal joint

Use a more specific code (4 billable, 3 non-billable)
M18.0Bilateral primary osteoarthritis of first carpometacarpal jointsM18.1Unilateral primary osteoarthritis of first carpometacarpal jointhas subcodesM18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal jointsM18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal jointhas subcodesM18.4Other bilateral secondary osteoarthritis of first carpometacarpal jointsM18.5Other unilateral secondary osteoarthritis of first carpometacarpal jointhas subcodesM18.9Osteoarthritis of first carpometacarpal joint, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

M15-M19 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • osteoarthritis of spine (M47.-)

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M15-M19Osteoarthritis (M15-M19)
M18Osteoarthritis of first carpometacarpal jointNot billable
M18.0Bilateral primary osteoarthritis of first carpometacarpal jointsBillable
M18.1Unilateral primary osteoarthritis of first carpometacarpal jointSubcodes
M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal jointsBillable
M18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal jointSubcodes
M18.4Other bilateral secondary osteoarthritis of first carpometacarpal jointsBillable
M18.5Other unilateral secondary osteoarthritis of first carpometacarpal jointSubcodes
M18.9Osteoarthritis of first carpometacarpal joint, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M18:

blockM15-M19
Osteoarthritis (M15-M19)
View context instructions
chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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