ICD10BillableValid for clinical use
ICD-10 Code C84.A9: Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sites
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. 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, extranodal and solid organ sites in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
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.
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
category
C84.ACutaneous T-cell lymphoma, unspecified
currentC84.A
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
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.AACutaneous T-cell lymphoma, unspecified, in remissioncode
Sibling codes
C84.A0Cutaneous T-cell lymphoma, unspecified, unspecified sitebillableC84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neckbillableC84.A2Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodesbillableC84.A3Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodesbillableC84.A4Cutaneous T-cell lymphoma, unspecified, lymph nodes of axilla and upper limbbillableC84.A5Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limbbillableC84.A6Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodesbillableC84.A7Cutaneous T-cell lymphoma, unspecified, spleenbillableC84.A8Cutaneous T-cell lymphoma, unspecified, lymph nodes of multiple sitesbillableC84.AACutaneous T-cell lymphoma, unspecified, in remissionbillable
Coverage-related procedures and services
CPT 38240high
HEMATOPOIETIC PROGENITOR CELL (HPC); ALLOGENEIC TRANSPLANTATION PER DONOR
Source: CMS coverage guidance
CPT 88182high
FLOW CYTOMETRY, CELL CYCLE OR DNA ANALYSIS
Source: CMS coverage guidance
CPT 88185high
FLOW CYTOMETRY, CELL SURFACE, CYTOPLASMIC, OR NUCLEAR MARKER, TECHNICAL COMPONENT ONLY; EACH ADDITIONAL MARKER (LIST SEPARATELY IN ADDITION TO CODE FOR FIRST MARKER)
Source: CMS coverage guidance
CPT 88184high
FLOW CYTOMETRY, CELL SURFACE, CYTOPLASMIC, OR NUCLEAR MARKER, TECHNICAL COMPONENT ONLY; FIRST MARKER
Source: CMS coverage guidance
CPT 88189high
FLOW CYTOMETRY, INTERPRETATION; 16 OR MORE MARKERS
Source: CMS coverage guidance
CPT 88187high
FLOW CYTOMETRY, INTERPRETATION; 2 TO 8 MARKERS
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Cutaneous T-cell lymphoma, unspecified, extranodal and solid organ sitesCutaneous T-cell lymphoma, unspecified
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.