C81.23 Mixed cellularity Hodgkin lymphoma, intra-abdominal lymph nodes

The ICD-10-CM code for Mixed cellularity Hodgkin lymphoma, intra-abdominal lymph nodes is C81.23 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C81-C96: Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

Category C81

85 codes (77 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

• An estimated 60 U.S. inpatient stays in 2023 included C81.23 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Metastatic lymphoid malignancy—use C81-C85 extranodal site code

t. Secondary malignant neoplasm of lymphoid tissue When a malignant neoplasm of lymphoid tissue metastasizes beyond the lymph nodes, a code from categories C81-C85 with a final character identifying “extranodal and solid organ sites” should be assigned rather than a code for the secondary neoplasm of the affected solid organ. For example, for metastasis of diffuse large B-cell lymphoma to the lung, brain and left adrenal gland, assign code C83.398, Diffuse large B-cell lymphoma of other extranodal and solid organ sites.

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)