C82.19
BillableFollicular lymphoma grade II, extranodal and solid organ sites
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C82.19 an HCC code?
Yes. C82.19 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 C82.19
For C82.19 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 C82.19 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C82.19 is the ICD-10-CM diagnosis code for follicular lymphoma grade ii, extranodal and solid organ sites. A type of slow-growing blood cancer (follicular lymphoma) that is grade II and located in organs or tissues outside the lymph node system. C82.19 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, C82.19 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, C82.19 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 code is used when the lymphoma involves solid organs (liver, spleen, bone marrow) or extranodal sites. Because C82.19 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 C82.19 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is used when the lymphoma involves solid organs (liver, spleen, bone marrow) or extranodal sites
- •Specify which organ or tissue is involved in the documentation for clarity
Clinical Significance
Follicular lymphoma grade II involving extranodal and solid organ sites indicates spread beyond the lymphatic system into organs such as bone marrow, liver, lungs, skin, or gastrointestinal tract. This represents stage IV disease by definition and typically requires more active management than purely nodal disease. Bone marrow involvement is the most common extranodal site in follicular lymphoma.
Documentation Requirements
- ✓Pathology confirming grade II follicular lymphoma in extranodal tissue
- ✓Identification of all involved extranodal sites
- ✓Bone marrow biopsy results documenting percentage of involvement if applicable
- ✓Organ function tests for affected organs (LFTs for liver, PFTs for lung involvement)
- ✓Stage IV designation in oncology documentation
Commonly Confused Codes
- •C82.17 — Spleen; splenic involvement has its own code, separate from extranodal
- •C82.18 — Multiple lymph node sites; use C82.19 for organ/extranodal involvement, not multi-site nodal
- •C82.09 — Grade I, extranodal; verify pathology grade
- •C83.39 — Diffuse large B-cell lymphoma, extranodal; if transformation has occurred