DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M18 Osteoarthritis of first carpometacarpal joint

  • Header · not billable

M18 is not billable. The category heads 13 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Osteoarthritishand jointfirst carpometacarpal joint → M18.9
  • Osteoarthritisprimaryhand jointfirst carpometacarpal joint → M18.1-
  • Osteoarthritissecondaryhand jointfirst carpometacarpal joint → M18.5-

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M15-M19 Osteoarthritis (M15-M19)
  3. M18 Osteoarthritis of first carpometacarpal joint
Billable codes
13
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
7

Codes in M18

  1. M18.0
    Bilateral primary osteoarthritis of first carpometacarpal joints
    Billable
  2. M18.1
    Unilateral primary osteoarthritis of first carpometacarpal joint
    Header
    Inclusion terms 1

    Inclusion terms

    • Primary osteoarthritis of first carpometacarpal joint NOS
  3. M18.10
    Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
    Billable
  4. M18.11
    Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
    Billable
  5. M18.12
    Unilateral primary osteoarthritis of first carpometacarpal joint, left hand
    Billable
  6. M18.2
    Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
    Billable
  7. M18.3
    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
    Header
    Inclusion terms 1

    Inclusion terms

    • Post-traumatic osteoarthritis of first carpometacarpal joint NOS
  8. M18.30
    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand
    Billable
  9. M18.31
    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand
    Billable
  10. M18.32
    Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand
    Billable
  11. M18.4
    Other bilateral secondary osteoarthritis of first carpometacarpal joints
    Billable
  12. M18.5
    Other unilateral secondary osteoarthritis of first carpometacarpal joint
    Header
    Inclusion terms 1

    Inclusion terms

    • Secondary osteoarthritis of first carpometacarpal joint NOS
  13. M18.50
    Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand
    Billable
  14. M18.51
    Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand
    Billable
  15. M18.52
    Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand
    Billable
  16. M18.9
    Osteoarthritis of first carpometacarpal joint, unspecified
    Billable

Sources of each column.

Instructions

Notes that also apply

Block M15-M19 instructions (Excludes2 1): printed on the block page.

Instructions for the group M00-M25 (Includes 1): printed on the chapter 13 page.

Chapter 13 instructions (Notes 1, Excludes2 10): printed on the chapter 13 page.

Index entries

  • Osteoarthritishand jointfirst carpometacarpal joint → M18.9
  • Osteoarthritisprimaryhand jointfirst carpometacarpal joint → M18.1-
  • Osteoarthritispost-traumatic NEChand jointfirst carpometacarpal joint → M18.3-
  • Osteoarthritissecondaryhand jointfirst carpometacarpal joint → M18.5-
  • Osteoarthritisprimaryhand jointfirst carpometacarpal jointbilateral → M18.0
  • Osteoarthritispost-traumatic NEChand jointfirst carpometacarpal jointbilateral → M18.2
  • Osteoarthritissecondaryhand jointfirst carpometacarpal jointbilateral → M18.4

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy