J99 Respiratory disorders in diseases classified elsewhere

The ICD-10-CM code for Respiratory disorders in diseases classified elsewhere is J99 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

10: Diseases of the respiratory system (J00-J99)

Section

J96-J99: Other diseases of the respiratory system (J96-J99)

Category J99

1 code (1 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

• An estimated 1,110 U.S. inpatient stays in 2023 included J99 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

Chapter 10 header (context)

10. Chapter 10: Diseases of the Respiratory System (J00-J99), U07.0

COPD/asthma: acute exacerbation vs uncomplicated

a. Chronic Obstructive Pulmonary Disease [COPD] and Asthma 1) Acute exacerbation of chronic obstructive bronchitis and asthma The codes in categories J44 and J45 distinguish between uncomplicated cases and those in acute exacerbation. An acute exacerbation is a worsening or a decompensation of a chronic condition. An acute exacerbation is not equivalent to an infection superimposed on a chronic condition, though an exacerbation may be triggered by an infection.

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)