C81.43
BillableLymphocyte-rich Hodgkin 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 C81.43 an HCC code?
Yes. C81.43 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 C81.43
For C81.43 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 C81.43 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C81.43 is the ICD-10-CM diagnosis code for lymphocyte-rich hodgkin lymphoma, intra-abdominal lymph nodes. A type of Hodgkin lymphoma with mostly lymphocytes that has spread to lymph nodes in the abdomen. C81.43 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, C81.43 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, C81.43 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.
Verify the pathology report confirms lymphocyte-rich subtype before coding. Because C81.43 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 C81.43 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the pathology report confirms lymphocyte-rich subtype before coding
- •Ensure documentation specifies intra-abdominal location; do not assume based on symptoms alone
Clinical Significance
Lymphocyte-rich Hodgkin lymphoma with intra-abdominal lymph node involvement represents an uncommon location for this favorable-prognosis subtype. Abdominal nodal involvement may indicate more advanced staging and can present with nonspecific symptoms including abdominal discomfort, early satiety, or constitutional B symptoms. The generally favorable biology of this subtype often leads to good outcomes even with abdominal disease.
Documentation Requirements
- ✓Pathology confirming lymphocyte-rich classical Hodgkin lymphoma
- ✓Imaging confirming intra-abdominal lymph node involvement (para-aortic, mesenteric, celiac, retroperitoneal)
- ✓Clear distinction from intrapelvic nodes which are below the pelvic brim
- ✓Staging documentation including all involved sites
- ✓Provider management plan during the encounter
Commonly Confused Codes
- •C81.46 — Lymphocyte-rich Hodgkin lymphoma, intrapelvic: abdominal nodes are above the pelvic brim; pelvic nodes are below it
- •C81.47 — Lymphocyte-rich Hodgkin lymphoma, spleen: splenic involvement is coded separately from abdominal node involvement
- •C81.23 — Mixed cellularity Hodgkin lymphoma, intra-abdominal: same location but different subtype; verify pathology