Coding and coverage · ICD-10-CM

C83

C83.0 Small cell B-cell lymphoma

Not billable (header)Chapter 2

Report one of the more specific codes below.

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Codes under this one

  • C83.00 Small cell B-cell lymphoma, unspecified site
  • C83.01 Small cell B-cell lymphoma, lymph nodes of head, face, and neck
  • C83.02 Small cell B-cell lymphoma, intrathoracic lymph nodes
  • C83.03 Small cell B-cell lymphoma, intra-abdominal lymph nodes
  • C83.04 Small cell B-cell lymphoma, lymph nodes of axilla and upper limb
  • C83.05 Small cell B-cell lymphoma, lymph nodes of inguinal region and lower limb
  • C83.06 Small cell B-cell lymphoma, intrapelvic lymph nodes
  • C83.07 Small cell B-cell lymphoma, spleen
  • C83.08 Small cell B-cell lymphoma, lymph nodes of multiple sites
  • C83.09 Small cell B-cell lymphoma, extranodal and solid organ sites
  • C83.0A Small cell B-cell lymphoma, in remission

Instructional notes

Chapter 2

Notes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

C83

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • personal history of non-Hodgkin lymphoma (Z85.72)

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • chronic lymphocytic leukemia (C91.1)
  • mature T/NK-cell lymphomas (C84.-)
  • Waldenström macroglobulinemia (C88.00)
Inclusion terms
  • Lymphoplasmacytic lymphoma
  • Nodal marginal zone lymphoma
  • Non-leukemic variant of B-CLL
  • Splenic marginal zone lymphoma

Chapter 2: Neoplasms · C00-C96 Malignant neoplasms (C00-C96)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.