DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C4A Merkel cell carcinoma

  • Header · not billable

C4A is not billable. The category heads 24 billable codes in FY2027, grouped under 10 subdivisions.

Index → code

  • Carcinoma (malignant)Merkel cell → C4A.9
  • Carcinoma (malignant)Merkel cellhip → C4A.7-
  • Carcinoma (malignant)Merkel celllip → C4A.0

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C43-C44 Melanoma and other malignant neoplasms of skin (C43-C44)
  3. C4A Merkel cell carcinoma
Billable codes
24
Subdivisions
10
CC / MCC codes
0 / 0
HCC V28 codes
24
New FY2027
0
Index entries
21

Codes in C4A

  1. C4A.0
    Merkel cell carcinoma of lip
    Billable21
    Excludes1 1

    Excludes1

    • malignant neoplasm of vermilion border of lip (C00.0-C00.2) C00.0 C00.2
  2. C4A.1
    Merkel cell carcinoma of eyelid, including canthus
    Header
  3. C4A.10
    Merkel cell carcinoma of unspecified eyelid, including canthus
    Billable21
  4. C4A.11
    Merkel cell carcinoma of right eyelid, including canthus
    Header
  5. C4A.111
    Merkel cell carcinoma of right upper eyelid, including canthus
    Billable21
  6. C4A.112
    Merkel cell carcinoma of right lower eyelid, including canthus
    Billable21
  7. C4A.12
    Merkel cell carcinoma of left eyelid, including canthus
    Header
  8. C4A.121
    Merkel cell carcinoma of left upper eyelid, including canthus
    Billable21
  9. C4A.122
    Merkel cell carcinoma of left lower eyelid, including canthus
    Billable21
  10. C4A.2
    Merkel cell carcinoma of ear and external auricular canal
    Header
  11. C4A.20
    Merkel cell carcinoma of unspecified ear and external auricular canal
    Billable21
  12. C4A.21
    Merkel cell carcinoma of right ear and external auricular canal
    Billable21
  13. C4A.22
    Merkel cell carcinoma of left ear and external auricular canal
    Billable21
  14. C4A.3
    Merkel cell carcinoma of other and unspecified parts of face
    Header
  15. C4A.30
    Merkel cell carcinoma of unspecified part of face
    Billable21
  16. C4A.31
    Merkel cell carcinoma of nose
    Billable21
  17. C4A.39
    Merkel cell carcinoma of other parts of face
    Billable21
  18. C4A.4
    Merkel cell carcinoma of scalp and neck
    Billable21
  19. C4A.5
    Merkel cell carcinoma of trunk
    Header
    Excludes2 2

    Excludes2

    • malignant neoplasm of anus NOS (C21.0) C21.0
    • malignant neoplasm of scrotum (C63.2) C63.2
  20. C4A.51
    Merkel cell carcinoma of anal skin
    Billable21
    Inclusion terms 2

    Inclusion terms

    • Merkel cell carcinoma of anal margin
    • Merkel cell carcinoma of perianal skin
  21. C4A.52
    Merkel cell carcinoma of skin of breast
    Billable21
  22. C4A.59
    Merkel cell carcinoma of other part of trunk
    Billable21
  23. C4A.6
    Merkel cell carcinoma of upper limb, including shoulder
    Header
  24. C4A.60
    Merkel cell carcinoma of unspecified upper limb, including shoulder
    Billable21
  25. C4A.61
    Merkel cell carcinoma of right upper limb, including shoulder
    Billable21
  26. C4A.62
    Merkel cell carcinoma of left upper limb, including shoulder
    Billable21
  27. C4A.7
    Merkel cell carcinoma of lower limb, including hip
    Header
  28. C4A.70
    Merkel cell carcinoma of unspecified lower limb, including hip
    Billable21
  29. C4A.71
    Merkel cell carcinoma of right lower limb, including hip
    Billable21
  30. C4A.72
    Merkel cell carcinoma of left lower limb, including hip
    Billable21
  31. C4A.8
    Merkel cell carcinoma of overlapping sites
    Billable21
  32. C4A.9
    Merkel cell carcinoma, unspecified
    Billable21
    Inclusion terms 2

    Inclusion terms

    • Merkel cell carcinoma of unspecified site
    • Merkel cell carcinoma NOS

Sources of each column.

Instructions

Notes that also apply

Chapter 2 instructions (Notes 8): printed on the chapter 2 page.

Index entries

  • Carcinoma (malignant)Merkel cell → C4A.9
  • Carcinoma (malignant)Merkel celllip → C4A.0
  • Carcinoma (malignant)Merkel cellcanthus → C4A.1-
  • Carcinoma (malignant)Merkel celleyelid, including canthus → C4A.1-
  • Carcinoma (malignant)Merkel cellear and external auricular canal → C4A.2-
  • Carcinoma (malignant)Merkel cellexternal auricular canal → C4A.2-
  • Carcinoma (malignant)Merkel cellface → C4A.30
  • Carcinoma (malignant)Merkel cellnose → C4A.31
  • Carcinoma (malignant)Merkel cellneck → C4A.4
  • Carcinoma (malignant)Merkel cellscalp → C4A.4
  • Carcinoma (malignant)Merkel cellanal margin → C4A.51
  • Carcinoma (malignant)Merkel cellanal skin → C4A.51
  • Carcinoma (malignant)Merkel cellperianal skin → C4A.51
  • Carcinoma (malignant)Merkel cellskin of breast → C4A.52
  • Carcinoma (malignant)Merkel celltrunk NEC → C4A.59
  • Carcinoma (malignant)Merkel cellshoulder → C4A.6-
  • Carcinoma (malignant)Merkel cellupper limb, including shoulder → C4A.6-
  • Carcinoma (malignant)Merkel cellhip → C4A.7-
  • Carcinoma (malignant)Merkel celllower limb, including hip → C4A.7-
  • Carcinoma (malignant)Merkel celloverlapping sites → C4A.8
  • Carcinoma (malignant)Merkel cellfacespecified NEC → C4A.39

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

Hierarchy