D40.10 Neoplasm of uncertain behavior of unspecified testis

The ICD-10-CM code for Neoplasm of uncertain behavior of unspecified testis is D40.10 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

D37-D48: Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes (D37-D48)

Category D40

8 codes (6 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to D40.10:

• Tumor › testicular
• Arrhenoblastoma › unspecified site › male
• Gonadoblastoma › unspecified site › male
• Androblastoma › unspecified site › male
• Gynandroblastoma › unspecified site › male
• Gonocytoma › unspecified site › male
• Tumor › Leydig cell › unspecified site › male

U.S. Hospital Utilization

D40.10 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.

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

Tx of primary site (TOC entry)

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

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary 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)