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ICD-10-CM · FY 2026 APRIL UPDATE

C84

Mature T/NK-cell lymphomas

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
C84.0Mycosis fungoidesCategory
C84.00Mycosis fungoides, unspecified siteBillable
C84.01Mycosis fungoides, lymph nodes of head, face, and neckBillable
C84.02Mycosis fungoides, intrathoracic lymph nodesBillable
C84.03Mycosis fungoides, intra-abdominal lymph nodesBillable
C84.04Mycosis fungoides, lymph nodes of axilla and upper limbBillable
C84.05Mycosis fungoides, lymph nodes of inguinal region and lower limbBillable
C84.06Mycosis fungoides, intrapelvic lymph nodesBillable
C84.07Mycosis fungoides, spleenBillable
C84.08Mycosis fungoides, lymph nodes of multiple sitesBillable
C84.09Mycosis fungoides, extranodal and solid organ sitesBillable
C84.0AMycosis fungoides, in remissionBillable
C84.1Sezary diseaseCategory
C84.10Sezary disease, unspecified siteBillable
C84.11Sezary disease, lymph nodes of head, face, and neckBillable
C84.12Sezary disease, intrathoracic lymph nodesBillable
C84.13Sezary disease, intra-abdominal lymph nodesBillable
C84.14Sezary disease, lymph nodes of axilla and upper limbBillable
C84.15Sezary disease, lymph nodes of inguinal region and lower limbBillable
C84.16Sezary disease, intrapelvic lymph nodesBillable
C84.17Sezary disease, spleenBillable
C84.18Sezary disease, lymph nodes of multiple sitesBillable
C84.19Sezary disease, extranodal and solid organ sitesBillable
C84.1ASezary disease, in remissionBillable
C84.4Peripheral T-cell lymphoma, not elsewhere classifiedCategory
C84.40Peripheral T-cell lymphoma, not elsewhere classified, unspecified siteBillable
C84.41Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of head, face, and neckBillable
C84.42Peripheral T-cell lymphoma, not elsewhere classified, intrathoracic lymph nodesBillable
C84.43Peripheral T-cell lymphoma, not elsewhere classified, intra-abdominal lymph nodesBillable
C84.44Peripheral T-cell lymphoma, not elsewhere classified, lymph nodes of axilla and upper limbBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.