C83.90
BillableNon-follicular (diffuse) lymphoma, unspecified, 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 (non-follicular lymphoma) where the specific location is not yet identified or documented.
Coding Tips
- •This is a less specific code; use only when site of involvement cannot be determined
- •Query provider if additional imaging or pathology results specify the lymphoma location
Clinical Significance
Non-follicular (diffuse) lymphoma, unspecified, at an unspecified site is the least specific code in the non-follicular lymphoma category, indicating both the subtype and anatomic site are unspecified. This code should prompt a query to the provider for more detailed pathology and imaging results. While it still maps to HCC categories, using more specific codes improves documentation quality and audit defensibility.
Documentation Requirements
- ✓Pathology report — query for specific non-follicular subtype if only 'lymphoma' or 'non-Hodgkin lymphoma' is documented
- ✓Any available imaging to determine site of involvement
- ✓Clinical notes supporting the lymphoma diagnosis
- ✓Treatment plan or referral to oncology
- ✓Disease status documentation
Commonly Confused Codes
C83.80 — Other non-follicular lymphoma, unspecified site: C83.80 indicates the subtype is known as 'other' but site is unspecified; C83.90 has both subtype and site unspecifiedC85.90 — Non-Hodgkin lymphoma, unspecified, unspecified site: Even less specific; use C83.90 when at least 'non-follicular' characterization is availableC83.30 — Diffuse large B-cell lymphoma, unspecified site: Use when pathology specifically identifies diffuse large B-cell lymphoma
Code Hierarchy
└C83Non-follicular lymphoma└C83.9Non-follicular (diffuse) lymphoma, unspecified└C83.90Non-follicular (diffuse) lymphoma, unspecified, unspecified site
└C83.90Non-follicular (diffuse) lymphoma, unspecified, unspecified site