DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M22 Disorder of patella

  • Header · not billable

M22 is not billable. The category heads 21 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Disorder (of)patella → M22.9-
  • Disorder (of)patellofemoral → M22.2X-
  • Chondromalacia (systemic)patella → M22.4-

Where it sits

  1. Chapter 13 Diseases of the musculoskeletal system and connective tissue (M00-M99)
  2. M20-M25 Other joint disorders (M20-M25)
  3. M22 Disorder of patella
Billable codes
21
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
9

Codes in M22

  1. M22.0
    Recurrent dislocation of patella
    Header
  2. M22.00
    Recurrent dislocation of patella, unspecified knee
    Billable
  3. M22.01
    Recurrent dislocation of patella, right knee
    Billable
  4. M22.02
    Recurrent dislocation of patella, left knee
    Billable
  5. M22.1
    Recurrent subluxation of patella
    Header
    Inclusion terms 1

    Inclusion terms

    • Incomplete dislocation of patella
  6. M22.10
    Recurrent subluxation of patella, unspecified knee
    Billable
  7. M22.11
    Recurrent subluxation of patella, right knee
    Billable
  8. M22.12
    Recurrent subluxation of patella, left knee
    Billable
  9. M22.2
    Patellofemoral disorders
    Header
  10. M22.2X
    Patellofemoral disorders
    Header
  11. M22.2X1
    Patellofemoral disorders, right knee
    Billable
  12. M22.2X2
    Patellofemoral disorders, left knee
    Billable
  13. M22.2X9
    Patellofemoral disorders, unspecified knee
    Billable
  14. M22.3
    Other derangements of patella
    Header
  15. M22.3X
    Other derangements of patella
    Header
  16. M22.3X1
    Other derangements of patella, right knee
    Billable
  17. M22.3X2
    Other derangements of patella, left knee
    Billable
  18. M22.3X9
    Other derangements of patella, unspecified knee
    Billable
  19. M22.4
    Chondromalacia patellae
    Header
  20. M22.40
    Chondromalacia patellae, unspecified knee
    Billable
  21. M22.41
    Chondromalacia patellae, right knee
    Billable
  22. M22.42
    Chondromalacia patellae, left knee
    Billable
  23. M22.8
    Other disorders of patella
    Header
  24. M22.8X
    Other disorders of patella
    Header
  25. M22.8X1
    Other disorders of patella, right knee
    Billable
  26. M22.8X2
    Other disorders of patella, left knee
    Billable
  27. M22.8X9
    Other disorders of patella, unspecified knee
    Billable
  28. M22.9
    Unspecified disorder of patella
    Header
  29. M22.90
    Unspecified disorder of patella, unspecified knee
    Billable
  30. M22.91
    Unspecified disorder of patella, right knee
    Billable
  31. M22.92
    Unspecified disorder of patella, left knee
    Billable

Sources of each column.

Instructions

At M22

Excludes2

  • traumatic dislocation of patella (S83.0-) S83.0

Notes that also apply

Block M20-M25 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

  • Disorder (of)patellofemoral → M22.2X-
  • Chondromalacia (systemic)patella → M22.4-
  • Disorder (of)patella → M22.9-
  • Dislocation (articular)patellarecurrent (nontraumatic) → M22.0-
  • Disorder (of)patelladerangement NEC → M22.3X-
  • Chondromalacia (systemic)kneepatella → M22.4-
  • Softeningcartilagepatella → M22.4-
  • Disorder (of)patellaspecified NEC → M22.8X-
  • Dislocation (articular)patellarecurrent (nontraumatic)incomplete → M22.1-

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

Hierarchy