ICD10
ICD-10 Code C83.9: Non-follicular (diffuse) lymphoma, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 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 non-follicular (diffuse) 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
C83Non-follicular lymphoma
currentC83
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
C83.90Non-follicular (diffuse) lymphoma, unspecified, unspecified sitecodeC83.91Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of head, face, and neckcodeC83.92Non-follicular (diffuse) lymphoma, unspecified, intrathoracic lymph nodescodeC83.93Non-follicular (diffuse) lymphoma, unspecified, intra-abdominal lymph nodescodeC83.94Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of axilla and upper limbcodeC83.95Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of inguinal region and lower limbcodeC83.96Non-follicular (diffuse) lymphoma, unspecified, intrapelvic lymph nodescodeC83.97Non-follicular (diffuse) lymphoma, unspecified, spleencodeC83.98Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of multiple sitescodeC83.99Non-follicular (diffuse) lymphoma, unspecified, extranodal and solid organ sitescodeC83.9ANon-follicular (diffuse) lymphoma, unspecified, in remissioncode
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 277616008high
Diffuse low grade B-cell lymphoma
Source: SNOMED International ICD-10 map
SNOMED_CT 307624007high
Diffuse malignant lymphoma - centroblastic-centrocytic
Source: SNOMED International ICD-10 map
SNOMED_CT 109962001high
Diffuse non-Hodgkin's lymphoma
Source: SNOMED International ICD-10 map
SNOMED_CT 449177007high
Diffuse non-Hodgkin's lymphoma of bone
Source: SNOMED International ICD-10 map
SNOMED_CT 449221001high
Diffuse non-Hodgkin's lymphoma of central nervous system
Source: SNOMED International ICD-10 map
SNOMED_CT 448560008high
Diffuse non-Hodgkin's lymphoma of extranodal site
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.
Legacy codes
C83.9
Replacement codes
C83.90 — Non-follicular (diffuse) lymphoma, unspecified, unspecified siteC83.91 — Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of head, face, and neckC83.92 — Non-follicular (diffuse) lymphoma, unspecified, intrathoracic lymph nodesC83.93 — Non-follicular (diffuse) lymphoma, unspecified, intra-abdominal lymph nodesC83.94 — Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of axilla and upper limbC83.95 — Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of inguinal region and lower limbC83.96 — Non-follicular (diffuse) lymphoma, unspecified, intrapelvic lymph nodesC83.97 — Non-follicular (diffuse) lymphoma, unspecified, spleenC83.98 — Non-follicular (diffuse) lymphoma, unspecified, lymph nodes of multiple sitesC83.99 — Non-follicular (diffuse) lymphoma, unspecified, extranodal and solid organ sitesC83.9A — Non-follicular (diffuse) lymphoma, unspecified, in remission
Common synonyms
Non-follicular (diffuse) lymphoma, unspecifiedNon-follicular (diffuse) lymphomaNon-follicularNon-follicular diffuse 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.