DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C84 Mature T/NK-cell lymphomas

  • Header · not billable

C84 is not billable. The category heads 89 billable codes in FY2027, grouped under 8 subdivisions.

Index → code

  • Sézary disease → C84.1-
  • Disease, diseasedSézary → C84.1-
  • Lymphoma (of) (malignant)Lennert's → C84.4-

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)
  3. C84 Mature T/NK-cell lymphomas
Billable codes
89
Subdivisions
8
CC / MCC codes
89 / 0
HCC V28 codes
89
New FY2027
0
Index entries
16

Codes in C84

  1. C84.0
    Mycosis fungoides
    Header
    Excludes1 1

    Excludes1

    • peripheral T-cell lymphoma, not elsewhere classified (C84.4-) C84.4
  2. C84.00
    Mycosis fungoides, unspecified site
    BillableCC20
  3. C84.01
    Mycosis fungoides, lymph nodes of head, face, and neck
    BillableCC20
  4. C84.02
    Mycosis fungoides, intrathoracic lymph nodes
    BillableCC20
  5. C84.03
    Mycosis fungoides, intra-abdominal lymph nodes
    BillableCC20
  6. C84.04
    Mycosis fungoides, lymph nodes of axilla and upper limb
    BillableCC20
  7. C84.05
    Mycosis fungoides, lymph nodes of inguinal region and lower limb
    BillableCC20
  8. C84.06
    Mycosis fungoides, intrapelvic lymph nodes
    BillableCC20
  9. C84.07
    Mycosis fungoides, spleen
    BillableCC20
  10. C84.08
    Mycosis fungoides, lymph nodes of multiple sites
    BillableCC20
  11. C84.09
    Mycosis fungoides, extranodal and solid organ sites
    BillableCC20
  12. C84.0A
    Mycosis fungoides, in remission
    BillableCC20
  13. C84.1
    Sézary disease
    Header
  14. C84.10
    Sézary disease, unspecified site
    BillableCC17
  15. C84.11
    Sézary disease, lymph nodes of head, face, and neck
    BillableCC17
  16. C84.12
    Sézary disease, intrathoracic lymph nodes
    BillableCC17
  17. C84.13
    Sézary disease, intra-abdominal lymph nodes
    BillableCC17
  18. C84.14
    Sézary disease, lymph nodes of axilla and upper limb
    BillableCC17
  19. C84.15
    Sézary disease, lymph nodes of inguinal region and lower limb
    BillableCC17
  20. C84.16
    Sézary disease, intrapelvic lymph nodes
    BillableCC17
  21. C84.17
    Sézary disease, spleen
    BillableCC17
  22. C84.18
    Sézary disease, lymph nodes of multiple sites
    BillableCC17
  23. C84.19
    Sézary disease, extranodal and solid organ sites
    BillableCC17
  24. C84.1A
    Sézary disease, in remission
    BillableCC17
  25. C84.4
    Peripheral T-cell lymphoma, not elsewhere classified
    Header
    Inclusion terms 3

    Inclusion terms

    • Lennert's lymphoma
    • Lymphoepithelioid lymphoma
    • Mature T-cell lymphoma, not elsewhere classified
  26. C84.40
    Peripheral T-cell lymphoma, not elsewhere classified, unspecified site
    BillableCC19
  27. C84.41
    Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neck
    BillableCC19
  28. C84.42
    Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodes
    BillableCC19
  29. C84.43
    Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodes
    BillableCC19
  30. C84.44
    Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limb
    BillableCC19
  31. C84.45
    Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of inguinal region and lower limb
    BillableCC19
  32. C84.46
    Peripheral T-cell lymphoma, not elsewhere classified, intrapelvic lymph nodes
    BillableCC19
  33. C84.47
    Peripheral T-cell lymphoma, not elsewhere classified, spleen
    BillableCC19
  34. C84.48
    Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of multiple sites
    BillableCC19
  35. C84.49
    Peripheral T-cell lymphoma, not elsewhere classified, extranodal and solid organ sites
    BillableCC19
  36. C84.4A
    Peripheral T-cell lymphoma, not elsewhere classified, in remission
    BillableCC19
  37. C84.6
    Anaplastic large cell lymphoma, ALK-positive
    Header
    Inclusion terms 1

    Inclusion terms

    • Anaplastic large cell lymphoma, CD30-positive
  38. C84.60
    Anaplastic large cell lymphoma, ALK-positive, unspecified site
    BillableCC20
  39. C84.61
    Anaplastic large cell lymphoma, ALK-positive, lymph nodes of head, face, and neck
    BillableCC20
  40. C84.62
    Anaplastic large cell lymphoma, ALK-positive, intrathoracic lymph nodes
    BillableCC20
  41. C84.63
    Anaplastic large cell lymphoma, ALK-positive, intra-abdominal lymph nodes
    BillableCC20
  42. C84.64
    Anaplastic large cell lymphoma, ALK-positive, lymph nodes of axilla and upper limb
    BillableCC20
  43. C84.65
    Anaplastic large cell lymphoma, ALK-positive, lymph nodes of inguinal region and lower limb
    BillableCC20
  44. C84.66
    Anaplastic large cell lymphoma, ALK-positive, intrapelvic lymph nodes
    BillableCC20
  45. C84.67
    Anaplastic large cell lymphoma, ALK-positive, spleen
    BillableCC20
  46. C84.68
    Anaplastic large cell lymphoma, ALK-positive, lymph nodes of multiple sites
    BillableCC20
  47. C84.69
    Anaplastic large cell lymphoma, ALK-positive, extranodal and solid organ sites
    BillableCC20
  48. C84.6A
    Anaplastic large cell lymphoma, ALK-positive, in remission
    BillableCC20
  49. C84.7
    Anaplastic large cell lymphoma, ALK-negative
    Header
    Excludes1 1

    Excludes1

    • primary cutaneous CD30-positive T-cell proliferations (C86.6-) C86.6
  50. C84.70
    Anaplastic large cell lymphoma, ALK-negative, unspecified site
    BillableCC19
  51. C84.71
    Anaplastic large cell lymphoma, ALK-negative, lymph nodes of head, face, and neck
    BillableCC19
  52. C84.72
    Anaplastic large cell lymphoma, ALK-negative, intrathoracic lymph nodes
    BillableCC19
  53. C84.73
    Anaplastic large cell lymphoma, ALK-negative, intra-abdominal lymph nodes
    BillableCC19
  54. C84.74
    Anaplastic large cell lymphoma, ALK-negative, lymph nodes of axilla and upper limb
    BillableCC19
  55. C84.75
    Anaplastic large cell lymphoma, ALK-negative, lymph nodes of inguinal region and lower limb
    BillableCC19
  56. C84.76
    Anaplastic large cell lymphoma, ALK-negative, intrapelvic lymph nodes
    BillableCC19
  57. C84.77
    Anaplastic large cell lymphoma, ALK-negative, spleen
    BillableCC19
  58. C84.78
    Anaplastic large cell lymphoma, ALK-negative, lymph nodes of multiple sites
    BillableCC19
  59. C84.79
    Anaplastic large cell lymphoma, ALK-negative, extranodal and solid organ sites
    BillableCC19
  60. C84.7A
    Anaplastic large cell lymphoma, ALK-negative, breast
    BillableCC19
    Inclusion terms 1, Use additional code 3

    Inclusion terms

    • Breast implant associated anaplastic large cell lymphoma (BIA-ALCL)

    Use additional code

    • code to identify:
    • breast implant status (Z98.82) Z98.82
    • personal history of breast implant removal (Z98.86) Z98.86
  61. C84.7B
    Anaplastic large cell lymphoma, ALK-negative, in remission
    BillableCC19
  62. C84.A
    Cutaneous T-cell lymphoma, unspecified
    Header
  63. C84.A0
    Cutaneous T-cell lymphoma, unspecified, unspecified site
    BillableCC20
  64. C84.A1
    Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck
    BillableCC20
  65. C84.A2
    Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes
    BillableCC20
  66. C84.A3
    Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes
    BillableCC20
  67. C84.A4
    Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limb
    BillableCC20
  68. C84.A5
    Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb
    BillableCC20
  69. C84.A6
    Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodes
    BillableCC20
  70. C84.A7
    Cutaneous T-cell lymphoma, unspecified, spleen
    BillableCC20
  71. C84.A8
    Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sites
    BillableCC20
  72. C84.A9
    Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sites
    BillableCC20
  73. C84.AA
    Cutaneous T-cell lymphoma, unspecified, in remission
    BillableCC20
  74. C84.Z
    Other mature T/NK-cell lymphomas
    Header
    Notes 1, Excludes1 8

    Notes

    • If T-cell lineage or involvement is mentioned in conjunction with a specific lymphoma, code to the more specific description.

    Excludes1

    • angioimmunoblastic T-cell lymphoma (C86.50) C86.50
    • blastic NK-cell lymphoma (C86.40) C86.40
    • enteropathy-type T-cell lymphoma (C86.20) C86.20
    • extranodal NK-cell lymphoma, nasal type (C86.00) C86.00
    • hepatosplenic T-cell lymphoma (C86.10) C86.10
    • primary cutaneous CD30-positive T-cell proliferations (C86.60) C86.60
    • subcutaneous panniculitis-like T-cell lymphoma (C86.30) C86.30
    • T-cell leukemia (C91.1-) C91.1
  75. C84.Z0
    Other mature T/NK-cell lymphomas, unspecified site
    BillableCC20
  76. C84.Z1
    Other mature T/NK-cell lymphomas, lymph nodes of head, face, and neck
    BillableCC20
  77. C84.Z2
    Other mature T/NK-cell lymphomas, intrathoracic lymph nodes
    BillableCC20
  78. C84.Z3
    Other mature T/NK-cell lymphomas, intra-abdominal lymph nodes
    BillableCC20
  79. C84.Z4
    Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb
    BillableCC20
  80. C84.Z5
    Other mature T/NK-cell lymphomas, lymph nodes of inguinal region and lower limb
    BillableCC20
  81. C84.Z6
    Other mature T/NK-cell lymphomas, intrapelvic lymph nodes
    BillableCC20
  82. C84.Z7
    Other mature T/NK-cell lymphomas, spleen
    BillableCC20
  83. C84.Z8
    Other mature T/NK-cell lymphomas, lymph nodes of multiple sites
    BillableCC20
  84. C84.Z9
    Other mature T/NK-cell lymphomas, extranodal and solid organ sites
    BillableCC20
  85. C84.ZA
    Other mature T/NK-cell lymphomas, in remission
    BillableCC20
  86. C84.9
    Mature T/NK-cell lymphomas, unspecified
    Header
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • NK/T cell lymphoma NOS

    Excludes1

    • mature T-cell lymphoma, not elsewhere classified (C84.4-) C84.4
  87. C84.90
    Mature T/NK-cell lymphomas, unspecified, unspecified site
    BillableCC20
  88. C84.91
    Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
    BillableCC20
  89. C84.92
    Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
    BillableCC20
  90. C84.93
    Mature T/NK-cell lymphomas, unspecified, intra-abdominal lymph nodes
    BillableCC20
  91. C84.94
    Mature T/NK-cell lymphomas, unspecified, lymph nodes of axilla and upper limb
    BillableCC20
  92. C84.95
    Mature T/NK-cell lymphomas, unspecified, lymph nodes of inguinal region and lower limb
    BillableCC20
  93. C84.96
    Mature T/NK-cell lymphomas, unspecified, intrapelvic lymph nodes
    BillableCC20
  94. C84.97
    Mature T/NK-cell lymphomas, unspecified, spleen
    BillableCC20
  95. C84.98
    Mature T/NK-cell lymphomas, unspecified, lymph nodes of multiple sites
    BillableCC20
  96. C84.99
    Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
    BillableCC20
  97. C84.9A
    Mature T/NK-cell lymphomas, unspecified, in remission
    BillableCC20

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At C84

Excludes1

  • personal history of non-Hodgkin lymphoma (Z85.72) Z85.72

Notes that also apply

Block C81-C96 instructions (Excludes2 4): printed on the block page.

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

Index entries

  • Sézary disease → C84.1-
  • Mycosis, mycoticfungoides (extranodal) (solid organ) → C84.0-
  • Disease, diseasedSézary → C84.1-
  • Lymphoma (of) (malignant)Lennert's → C84.4-
  • Lymphoma (of) (malignant)lymphoepithelioid → C84.4-
  • Lymphoma (of) (malignant)mature T-cell NEC → C84.4-
  • Lymphoma (of) (malignant)peripheral T-cell NEC → C84.4-
  • Lymphoma (of) (malignant)cutaneous T-cell → C84.A-
  • Lymphoma (of) (malignant)mature T/NK-cell → C84.9-
  • Lymphoma (of) (malignant)NK/T cell → C84.9-
  • Lymphoma (of) (malignant)primary central nervous system (brain) (meninges) (PCNSL) (spinal cord)peripheral T-cell → C84.49
  • Lymphoma (of) (malignant)anaplastic large cellALK-positive → C84.6-
  • Lymphoma (of) (malignant)anaplastic large cellCD30-positive → C84.6-
  • Lymphoma (of) (malignant)anaplastic large cellALK-negative → C84.7-
  • Lymphoma (of) (malignant)anaplastic large cellbreast implant associated (BIA-ALCL) → C84.7A
  • Lymphoma (of) (malignant)mature T/NK-cellspecified NEC → C84.Z-

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

Hierarchy