C82.80
BillableOther types of follicular lymphoma, unspecified site
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is C82.80 an HCC code?
Yes. C82.80 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 C82.80
For C82.80to 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 C82.80 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
C82.80 is the ICD-10-CM diagnosis code for other types of follicular lymphoma, unspecified site. A less common type of follicular lymphoma (blood cancer) with an unspecified or unknown location in the body. C82.80 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, C82.80 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, C82.80 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.
Use this code only when the specific anatomical site of the lymphoma is not documented or cannot be determined. Because C82.80 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 C82.80 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific anatomical site of the lymphoma is not documented or cannot be determined
- •Query the provider if possible to obtain site-specific information for more accurate coding
Clinical Significance
Other types of follicular lymphoma at an unspecified site is used for follicular lymphoma variants that do not fit into the standard grade I-IIIb, diffuse, or cutaneous categories. This includes rare variants such as pediatric-type follicular lymphoma, follicular lymphoma with areas of diffuse large B-cell lymphoma transformation, or other unusual patterns. The unspecified site should prompt a query to identify the anatomical location from imaging or pathology reports.
Documentation Requirements
- ✓Pathology report specifying the follicular lymphoma variant that qualifies as 'other type'
- ✓Immunohistochemistry and molecular studies supporting the diagnosis
- ✓Attempt to obtain site-specific information from imaging or clinical notes
- ✓Staging evaluation appropriate to the specific variant
- ✓Documentation of why the standard follicular lymphoma grade codes are not applicable
Commonly Confused Codes
- •C82.90 — Follicular lymphoma, unspecified, unspecified site: Use C82.80 when a specific 'other' type is identified but site is unknown; use C82.90 when both type and site are unspecified
- •C82.50 — Diffuse follicle center lymphoma, unspecified site: Use when specifically identified as diffuse follicle center type
- •C82.40 — Follicular lymphoma grade IIIb, unspecified site: Use when grade IIIb is specifically documented