ICD10
ICD-10 Code C84.A: Cutaneous T-cell lymphoma, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Neoplasms (C00-D49).
When is it used?
- May be used when a clinician documents cutaneous t-cell lymphoma, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
chapter
2Neoplasms (C00-D49)
block
C00-C96Malignant neoplasms
block
C81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
category
C84Mature T/NK-cell lymphomas
currentC84
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
Related specialists
OncologistGeneral Physician
Related codes
C84.A0Cutaneous T-cell lymphoma, unspecified, unspecified sitecodeC84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neckcodeC84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodescodeC84.A3Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodescodeC84.A4Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limbcodeC84.A5Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limbcodeC84.A6Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodescodeC84.A7Cutaneous T-cell lymphoma, unspecified, spleencodeC84.A8Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sitescodeC84.A9Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sitescodeC84.AACutaneous T-cell lymphoma, unspecified, in remissioncode
Sibling codes
Coding guidelines
Common synonyms
Cutaneous T-cell lymphoma, unspecifiedCutaneous T-cell lymphoma
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.