Congenital malformation syndromes due to known exogenous causes, not elsewhere classified (Q86) ICD-10-CM
The Q86 code range covers congenital malformation syndromes due to known exogenous causes, not elsewhere classified with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the Q86 Range 5 codes · 4 billable
About the Q86 Code Range
The Q86 ICD-10 code section identifies congenital malformation syndromes caused by known external substances during pregnancy. It includes specific conditions like Fetal Alcohol Syndrome (Q86.0) and other syndromes linked to exposure to drugs or chemicals before birth.
This category is used for coding birth defects resulting from harmful environmental factors, sometimes called exogenous causes. For instance, the ICD-10 code for Fetal Alcohol Syndrome (also known as Fetal Alcohol Spectrum Disorder) is Q86.0, which describes growth problems and developmental abnormalities due to prenatal alcohol exposure. Similarly, Q86.1 covers Fetal Hydantoin Syndrome caused by certain anti-seizure medications, and Q86.2 denotes dysmorphic features from warfarin, a blood thinner. The broader code Q86.8 includes various other teratogenic syndromes such as those from isotretinoin, valproic acid, benzodiazepines, and other drugs or chemicals known to cause birth defects. These detailed codes help accurately capture the specific cause of congenital anomalies related to environmental exposures.
Questions About This Page
How many billable codes are in the Q86 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the Q86 range classify?
The range classifies congenital malformation syndromes due to known exogenous causes, not elsewhere classified. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
