C83.84
BillableOther non-follicular lymphoma, lymph nodes of axilla and upper limb
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C83.84 an HCC code?
Yes. C83.84 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model (and Lymphoma and Other Cancers under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for C83.84
For C83.84 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed C83.84 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C83.84 is the ICD-10-CM diagnosis code for other non-follicular lymphoma, lymph nodes of axilla and upper limb. A type of non-follicular lymphoma affecting the lymph nodes in the armpits and upper arms. C83.84 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of lymphoid, hematopoietic and related tissue (c81-c96).
Under the CMS-HCC V28 risk adjustment model, C83.84 maps to Breast, Prostate, Colorectal and Other Cancers and Tumors (HCC 21) with a community, non-dual, aged base RAF weight of 0.545. Under the older CMS-HCC V24 model, C83.84 maps to Lymphoma and Other Cancers (HCC 10) with a community, non-dual, aged base RAF weight of 0.675. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This includes axillary lymph nodes and lymph nodes of the upper extremities. Because C83.84 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for C83.84 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This includes axillary lymph nodes and lymph nodes of the upper extremities
- •Document whether involvement is unilateral or bilateral for complete clinical picture
Clinical Significance
Other non-follicular lymphoma involving axillary and upper limb lymph nodes represents disease affecting a common lymph node drainage basin. Axillary lymphadenopathy from lymphoma must be distinguished from reactive lymphadenopathy or metastatic disease from breast or upper extremity malignancies. This site-specific code supports accurate staging and treatment planning documentation.
Documentation Requirements
- ✓Pathology confirming non-follicular lymphoma subtype from axillary or upper limb node biopsy
- ✓Physical examination or imaging confirming axillary or upper limb lymph node involvement
- ✓Laterality documentation (unilateral vs. bilateral) if available
- ✓Staging information and whether disease extends beyond this region
- ✓Current treatment status
Commonly Confused Codes
- •C83.94 — Non-follicular (diffuse) lymphoma, unspecified, axilla/upper limb: C83.84 indicates a known 'other' subtype; C83.94 is for unspecified subtype
- •C83.34 — Diffuse large B-cell lymphoma, axilla/upper limb: Use when pathology specifically confirms diffuse large B-cell lymphoma
- •C77.3 — Secondary malignant neoplasm of axillary lymph nodes: Use for metastatic cancer to axillary nodes, not primary lymphoma