C83.83
BillableOther non-follicular lymphoma, intra-abdominal lymph nodes
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C83.83 an HCC code?
Yes. C83.83 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 C83.83
For C83.83 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 C83.83 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C83.83 is the ICD-10-CM diagnosis code for other non-follicular lymphoma, intra-abdominal lymph nodes. A type of non-follicular lymphoma affecting the lymph nodes within the abdominal cavity. C83.83 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, C83.83 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, C83.83 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.
Intra-abdominal lymph nodes include mesenteric, retroperitoneal, and other abdominal lymph nodes. Because C83.83 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 C83.83 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Intra-abdominal lymph nodes include mesenteric, retroperitoneal, and other abdominal lymph nodes
- •Confirm abdominal lymph node involvement is documented before using this code
Clinical Significance
Other non-follicular lymphoma of intra-abdominal lymph nodes involves mesenteric, retroperitoneal, celiac, or other abdominal lymph node chains. Abdominal lymphoma can present with nonspecific symptoms like abdominal pain, bloating, or bowel obstruction, sometimes leading to delayed diagnosis. Accurate site coding supports appropriate risk stratification for this complex presentation.
Documentation Requirements
- ✓Pathology confirming non-follicular lymphoma subtype
- ✓Abdominal imaging (CT, PET/CT, or MRI) documenting intra-abdominal lymph node involvement
- ✓Specification of which abdominal lymph node chain is involved (mesenteric, retroperitoneal, para-aortic)
- ✓Current disease status and staging
- ✓Treatment plan and any surgical interventions
Commonly Confused Codes
- •C83.93 — Non-follicular (diffuse) lymphoma, unspecified, intra-abdominal: Use when the non-follicular subtype is unspecified; C83.83 indicates a known 'other' subtype
- •C83.89 — Other non-follicular lymphoma, extranodal: If the lymphoma involves abdominal organs (liver, spleen excluded, bowel wall) rather than abdominal lymph nodes, use the extranodal code
- •C83.87 — Other non-follicular lymphoma, spleen: Splenic involvement has its own code; do not combine with intra-abdominal nodal code