C83.17
BillableMantle cell lymphoma, spleen
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C83.17 an HCC code?
Yes. C83.17 maps to Lung and Other Severe Cancers 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 C83.17
For C83.17 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 C83.17 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C83.17 is the ICD-10-CM diagnosis code for mantle cell lymphoma, spleen. Mantle cell lymphoma is a type of cancer that starts in the lymph cells and has spread to or is located in the spleen. The spleen is an organ that helps filter blood and fight infections. C83.17 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, C83.17 maps to Lung and Other Severe Cancers (HCC 20) with a community, non-dual, aged base RAF weight of 0.000. Under the older CMS-HCC V24 model, C83.17 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 documentation specifies the spleen as the site of involvement; if multiple sites are involved, code each site separately with appropriate combination codes. Because C83.17 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 C83.17 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation specifies the spleen as the site of involvement; if multiple sites are involved, code each site separately with appropriate combination codes
- •Confirm the histological type is mantle cell lymphoma and not another type of non-Hodgkin lymphoma, as this affects code selection and treatment planning
Clinical Significance
Mantle cell lymphoma of the spleen is a significant extranodal site that may present with marked splenomegaly and cytopenias. Splenic involvement often indicates advanced-stage disease and may require splenectomy for diagnosis or symptom relief. Post-splenectomy patients face lifelong infection risk requiring appropriate vaccination and prophylaxis.
Documentation Requirements
- ✓Pathology confirmation from splenectomy specimen or splenic biopsy
- ✓Imaging documenting splenomegaly or splenic lesions (CT, PET/CT, ultrasound)
- ✓Complete blood count with assessment for hypersplenism-related cytopenias
- ✓Splenectomy status and date if applicable
- ✓Post-splenectomy vaccination documentation and prophylaxis plan
Commonly Confused Codes
- •C83.13 — Mantle cell lymphoma, intra-abdominal; spleen has its own specific code despite being an abdominal organ
- •C83.19 — Extranodal/solid organ sites; use C83.17 specifically for splenic involvement
- •D73.1 — Hypersplenism; this is a functional disorder, not a neoplasm
- •C83.07 — Small cell B-cell lymphoma, spleen; different histological subtype