A27.89 Other forms of leptospirosis

The ICD-10-CM code for Other forms of leptospirosis is A27.89 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

A20-A28: Certain zoonotic bacterial diseases (A20-A28)

Category A27

6 codes (4 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to A27.89:

• Nanukayami
• Fort Bragg fever
• Leptospirosis › canicola
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › Fort Bragg
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › seven day (leptospirosis) (autumnal) (Japanese)
• Leptospirosis › pomona
• Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › pretibial
• Infection, infected, infective (opportunistic) › Leptospira interrogans › autumnalis

U.S. Hospital Utilization

A27.89 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

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)