B74.9 Filariasis, unspecified

The ICD-10-CM code for Filariasis, unspecified is B74.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

B65-B83: Helminthiases (B65-B83)

Category B74

8 codes (7 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to B74.9:

• Mumu
• Orchitis (gangrenous) (nonspecific) (septic) (suppurative) › filarial
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › chylous (filarial)
• Chylothorax (nonfilarial) › filarial
• Chylocele (nonfilarial) › filarial
• Epididymitis (acute) (nonvenereal) (recurrent) (residual) › filarial
• Infestation › filarial
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › due to or associated with › filariasis NOS

U.S. Hospital Utilization

• An estimated 85 U.S. inpatient stays in 2018 included B74.9 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

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

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)