Y90.0
Blood alcohol level of less than 20 mg/100 ml
Y90.0 (also written Y900) is a billable ICD-10-CM diagnosis code for blood alcohol level of less than 20 mg/100 ml. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 10 codes in category Y90 (Evidence of alcohol involvement determined by blood alcohol level). Its coding notes include a Code first instruction.
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
An external cause code is never a principal or first-listed diagnosis. Its 7th character is assigned for each encounter and should match the injury or condition code.
Y90 can be assigned when the provider has documented an F10 condition, and the blood alcohol level does not need to be documented by the provider.
Code first
If the underlying condition listed here is present and known, sequence it first.
Notes
Also from chapter/block level (2 notes)
- These categories may be used to provide supplementary information concerning causes of morbidity. They are not to be used for single-condition coding.
- This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.