Supplementary factors related to causes of morbidity classified elsewhere (Y90-Y99) ICD-10-CM
The Y90–Y99 section covers supplementary factors related to causes of morbidity classified elsewhere with 396 ICD-10-CM diagnosis codes, of which 334 are billable in fiscal year 2026. The section is organized into the 5 code ranges listed below.
- These categories may be used to provide supplementary information concerning causes of morbidity. They are not to be used for single-condition coding.
Code Ranges in This Section 5 ranges · 396 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the Y90–Y99 Code Range
ICD-10 codes Y90 through Y99 cover supplementary factors related to causes of illness or injury described elsewhere, specifically indicating evidence of alcohol use, places of occurrence, activities, nosocomial conditions, and external cause status. These codes enhance medical documentation by detailing circumstances linked to the primary diagnosis.
This range begins with Y90 codes which document various blood alcohol levels, helping coders identify alcohol involvement in conditions or injuries. For example, Y90.9 is used when alcohol presence in blood is noted but the level is unspecified, also referenced as a high ethanol or alcohol level in blood. The extensive Y92 series specifies the location where an external cause occurred, from private residences (like kitchens and garages) to public places (schools, hospitals, streets, sports arenas) and industrial sites. These place-of-occurrence codes incorporate many detailed synonyms related to accidents or exposures, such as "accident due to fire in private dwelling," "suicide while incarcerated," or "accident caused by electric wiring in hospital." The Y93 codes classify activities engaged in at the time of the event or injury, including sports, water activities, dancing, caregiving, and computer use, often linking to external cause activity codes. Nosocomial conditions (Y95) identify healthcare-associated infections or complications, while the Y99 codes describe the individual’s external cause status, such as military or volunteer activity. This detailed coding supports accurate reporting of contributory factors in morbidity cases.
Questions About This Page
How many codes are in the Y90-Y99 range?
The Y90-Y99 range contains 396 ICD-10-CM diagnosis codes in FY 2026. 334 of them are billable, and the rest are category headers that organize the section.
What conditions does Y90-Y99 cover?
The range covers supplementary factors related to causes of morbidity classified elsewhere. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
