ICD-10-CM 2027 diagnosis code

J66Airway disease due to specific organic dust

Not billable — use a more specific code

J66 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About J66

J66 is the ICD-10-CM diagnosis code for airway disease due to specific organic dust. It belongs to block J60-J70 (lung diseases due to external agents) and chapter 10 (diseases of the respiratory system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: J66.0 (Byssinosis), J66.1 (disease), J66.2 (Cannabinosis) and J66.8 (dusts).

The conditions in its Excludes2 note aren't part of J66, but may be coded alongside it if the patient has both: allergic alveolitis (J67.-), asbestosis (J61), bagassosis (J67.1), farmer's lung (J67.0) and 2 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under J66

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

allergic alveolitis (J67.-)
asbestosis (J61)
bagassosis (J67.1)
farmer's lung (J67.0)
hypersensitivity pneumonitis due to organic dust (J67.-)
reactive airways dysfunction syndrome (J68.3)

Notes that apply from higher levels

Instructions written at a parent level also apply to J66.

Broader instructions also apply from J60-J70 Lung diseases due to external agents and Chapter 10: Diseases of the respiratory system.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about J66

Is J66 billable?: No. J66 is a header code. Report one of its more specific subcodes instead.