DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

M20 Acquired deformities of fingers and toes

  • Header · not billable

M20 is not billable. The category heads 33 billable codes in FY2027, grouped under 7 subdivisions.

Index → code

  • Halluxlimitus → M20.5X-
  • Halluxvarus (acquired) → M20.3-
  • Deformitytoe (acquired) → M20.6-

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. M20 Acquired deformities of fingers and toes
Billable codes
33
Subdivisions
7
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
17

Codes in M20

  1. M20.0
    Deformity of finger(s)
    Header
    Excludes1 3

    Excludes1

    • clubbing of fingers (R68.3) R68.3
    • palmar fascial fibromatosis [Dupuytren] (M72.0) M72.0
    • trigger finger (M65.3) M65.3
  2. M20.00
    Unspecified deformity of finger(s)
    Header
  3. M20.001
    Unspecified deformity of right finger(s)
    Billable
  4. M20.002
    Unspecified deformity of left finger(s)
    Billable
  5. M20.009
    Unspecified deformity of unspecified finger(s)
    Billable
  6. M20.01
    Mallet finger
    Header
  7. M20.011
    Mallet finger of right finger(s)
    Billable
  8. M20.012
    Mallet finger of left finger(s)
    Billable
  9. M20.019
    Mallet finger of unspecified finger(s)
    Billable
  10. M20.02
    Boutonnière deformity
    Header
  11. M20.021
    Boutonnière deformity of right finger(s)
    Billable
  12. M20.022
    Boutonnière deformity of left finger(s)
    Billable
  13. M20.029
    Boutonnière deformity of unspecified finger(s)
    Billable
  14. M20.03
    Swan-neck deformity
    Header
  15. M20.031
    Swan-neck deformity of right finger(s)
    Billable
  16. M20.032
    Swan-neck deformity of left finger(s)
    Billable
  17. M20.039
    Swan-neck deformity of unspecified finger(s)
    Billable
  18. M20.09
    Other deformity of finger(s)
    Header
  19. M20.091
    Other deformity of right finger(s)
    Billable
  20. M20.092
    Other deformity of left finger(s)
    Billable
  21. M20.099
    Other deformity of finger(s), unspecified finger(s)
    Billable
  22. M20.1
    Hallux valgus (acquired)
    Header
    Excludes2 1

    Excludes2

  23. M20.10
    Hallux valgus (acquired), unspecified foot
    Billable
  24. M20.11
    Hallux valgus (acquired), right foot
    Billable
  25. M20.12
    Hallux valgus (acquired), left foot
    Billable
  26. M20.2
    Hallux rigidus
    Header
  27. M20.20
    Hallux rigidus, unspecified foot
    Billable
  28. M20.21
    Hallux rigidus, right foot
    Billable
  29. M20.22
    Hallux rigidus, left foot
    Billable
  30. M20.3
    Hallux varus (acquired)
    Header
  31. M20.30
    Hallux varus (acquired), unspecified foot
    Billable
  32. M20.31
    Hallux varus (acquired), right foot
    Billable
  33. M20.32
    Hallux varus (acquired), left foot
    Billable
  34. M20.4
    Other hammer toe(s) (acquired)
    Header
  35. M20.40
    Other hammer toe(s) (acquired), unspecified foot
    Billable
  36. M20.41
    Other hammer toe(s) (acquired), right foot
    Billable
  37. M20.42
    Other hammer toe(s) (acquired), left foot
    Billable
  38. M20.5
    Other deformities of toe(s) (acquired)
    Header
  39. M20.5X
    Other deformities of toe(s) (acquired)
    Header
  40. M20.5X1
    Other deformities of toe(s) (acquired), right foot
    Billable
  41. M20.5X2
    Other deformities of toe(s) (acquired), left foot
    Billable
  42. M20.5X9
    Other deformities of toe(s) (acquired), unspecified foot
    Billable
  43. M20.6
    Acquired deformities of toe(s), unspecified
    Header
  44. M20.60
    Acquired deformities of toe(s), unspecified, unspecified foot
    Billable
  45. M20.61
    Acquired deformities of toe(s), unspecified, right foot
    Billable
  46. M20.62
    Acquired deformities of toe(s), unspecified, left foot
    Billable

Sources of each column.

Instructions

At M20

Excludes1

  • acquired absence of fingers and toes (Z89.-) Z89
  • congenital absence of fingers and toes (Q71.3-, Q72.3-) Q71.3 Q72.3
  • congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-) Q66 Q68 Q70 Q74

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

  • Deformityfinger (acquired) → M20.00-
  • Halluxvalgus (acquired) → M20.1-
  • Halluxrigidus (acquired) → M20.2-
  • Halluxmalleus (acquired) NEC → M20.3-
  • Halluxvarus (acquired) → M20.3-
  • Halluxdeformity (acquired) NEC → M20.5X-
  • Halluxlimitus → M20.5X-
  • Deformitytoe (acquired) → M20.6-
  • Deformityfinger (acquired)mallet finger → M20.01-
  • Deformityfinger (acquired)boutonniere → M20.02-
  • Deformityfinger (acquired)swan-neck → M20.03-
  • Deformityfinger (acquired)specified NEC → M20.09-
  • Deformitytoe (acquired)hallux valgus → M20.1-
  • Deformitytoe (acquired)hallux rigidus → M20.2-
  • Deformitytoe (acquired)hallux varus → M20.3-
  • Deformitytoe (acquired)hammer toe → M20.4-
  • Deformitytoe (acquired)specified NEC → M20.5X-

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

Hierarchy