ICDcodes.org
FY2027

C84.9 — Mature T/NK-cell lymphomas, unspecified

Not billable

Is C84.9 billable?

No — C84.9 is a non-billable header code. C84.9 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 11 billable codes beneath C84.9.

Billable codes under this header

C84.9 at a glance

CodeC84.9
DescriptionMature T/NK-cell lymphomas, unspecified
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

How is C84.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to C84.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Lymphoma › mature T/NK-cell (of) (malignant)
  • Lymphoma › NK/T cell (of) (malignant)

Excludes1 — never code together

The conditions below can never be reported together with C84.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • mature T-cell lymphoma, not elsewhere classified (C84.4-)

Inclusion terms

Alternative wording in documentation that is classified to C84.9.

  • NK/T cell lymphoma NOS

Excludes1 — never code together — inherited from C84

The conditions below can never be reported together with C84.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

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

Excludes2 — not included here — inherited from C81-C96

The conditions below are not part of C84.9, but a patient may have both at the same time. When documentation supports it, C84.9 and the excluded code may both be reported.

  • Kaposi's sarcoma of lymph nodes (C46.3)
  • secondary and unspecified neoplasm of lymph nodes (C77.-)
  • secondary neoplasm of bone marrow (C79.52)
  • secondary neoplasm of spleen (C78.89)

What codes fall under C84.9? (11)

How long has C84.9 existed?

C84.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with C84.9?

ICD-10-CM declares these codes mutually exclusive with C84.9 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to C84.9?

What other codes are in the C84 family? (7)