B83.9 Helminthiasis, unspecified

The ICD-10-CM code for Helminthiasis, unspecified is B83.9 (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 B83

8 codes (7 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to B83.9:

• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › worm
• Infection, infected, infective (opportunistic) › helminths
• Infestation › worms
• Infection, infected, infective (opportunistic) › worms
• Infestation › helminth
• Colic (bilious) (infantile) (intestinal) (recurrent) (spasmodic) › worm NOS
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › due to or associated with › helminthiasis
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › in (due to) › helminthiasis NEC

Inclusion Terms

• Worms NOS

U.S. Hospital Utilization

• An estimated 60 U.S. inpatient stays in 2021 included B83.9 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)