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ICD-10-CM 2027 diagnosis code

C82.1Follicular lymphoma grade II

Not billable — use a more specific code

C82.1 is a header code, so it can't be reported by itself. Choose one of the 11 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C82.1

C82.1 is the ICD-10-CM diagnosis code for follicular lymphoma grade II. It belongs to category C82 (follicular lymphoma), block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 11 subcodes must be used instead.

Within C82 (follicular lymphoma), C82.1 is specifically for follicular lymphoma grade II. Related codes cover grade I (C82.0), grade III, unspecified (C82.2), grade IIIa (C82.3), grade IIIb (C82.4), diffuse follicle center lymphoma (C82.5), cutaneous follicle center lymphoma (C82.6), other types of follicular lymphoma (C82.8) and unspecified (C82.9).

To report this condition, pick the subcode that matches the documentation: C82.10 (unspecified site), C82.11 (lymph nodes of head, face, and neck), C82.12 (intrathoracic lymph nodes), C82.13 (intra-abdominal lymph nodes), C82.14 (lymph nodes of axilla and upper limb), C82.15 (lymph nodes of inguinal region and lower limb), C82.16 (intrapelvic lymph nodes), C82.17 (spleen) and 3 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C82.1

Notes that apply from higher levels

Instructions written at a parent level also apply to C82.1.

› From C82 Follicular lymphoma
Includes
  • follicular lymphoma with or without diffuse areas
Excludes1
  • mature T/NK-cell lymphomas (C84.-)
  • personal history of non-Hodgkin lymphoma (Z85.72)

Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to C82.1.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about C82.1

Is C82.1 billable?

No. C82.1 is a header code. Report one of its more specific subcodes instead.