C82.30
BillableFollicular lymphoma grade IIIa, unspecified site
HCC Category Mapping
V28HCC 21 — Breast, Prostate, Colorectal and Other Cancers and Tumors
0.545V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 21 — Hodgkin Lymphoma and Other Cancers
0.000What This Code Means
A type of blood cancer (follicular lymphoma grade IIIa) at an unspecified location in the body. Grade IIIa is a more aggressive form of this cancer.
Coding Tips
- •Use this code only when the specific anatomical site is not documented
- •Attempt to obtain site information from pathology or imaging reports to use a more specific code
Clinical Significance
Follicular lymphoma grade IIIa at an unspecified site identifies a specific high-grade subtype where centroblasts exceed 15 per HPF but centrocytes are still present. Grade IIIa is clinically distinct from IIIb — it retains some indolent characteristics and some oncologists manage it similarly to grades I-II. The unspecified site should prompt a provider query.
Documentation Requirements
- ✓Pathology report confirming grade IIIa (>15 centroblasts per HPF with residual centrocytes)
- ✓Clear documentation distinguishing IIIa from IIIb pattern
- ✓Query provider for specific anatomic site
- ✓Ann Arbor staging
- ✓Treatment approach documentation (may vary between indolent and aggressive protocols)
Commonly Confused Codes
C82.40 — Grade IIIb, unspecified; IIIb has sheets of centroblasts only, no centrocytesC82.20 — Grade III unspecified, unspecified site; use C82.30 when pathology specifies IIIaC82.10 — Grade II, unspecified site; grade II has fewer centroblasts (6-15)C83.30 — Diffuse large B-cell lymphoma; grade IIIa is still classified as follicular, not DLBCL
Code Hierarchy
└C82Follicular lymphoma└C82.3Follicular lymphoma grade IIIa└C82.30Follicular lymphoma grade IIIa, unspecified site
└C82.30Follicular lymphoma grade IIIa, unspecified site