ICD-10-CM 2027
ICD-10 code for toxicology findings abnormal
From the official ICD-10-CM alphabetic index entry “Abnormal, abnormality, abnormalities › toxicology (findings)”. Page updated September 29, 2026.
About coding toxicology findings abnormal
The ICD-10-CM code for toxicology findings abnormal is R78.9 (Finding of unspecified substance, not normally found in blood).
Within R78, choose R78.9 (unspecified substance, not normally found in blood) only when documentation doesn't support a more specific option: alcohol in blood (R78.0), opiate drug in blood (R78.1), cocaine in blood (R78.2), hallucinogen in blood (R78.3), other drugs of addictive potential in blood (R78.4), other psychotropic drug in blood (R78.5), steroid agent in blood (R78.6), abnormal level of heavy metals in blood (R78.7) and 1 more.
Use an additional code to identify any retained foreign body, if applicable (Z18.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Common questions about toxicology findings abnormal ICD-10 codes
What is the ICD-10 code for toxicology findings abnormal?
- R78.9 — Finding of unspecified substance, not normally found in blood.
Is R78.9 billable?
- Yes. R78.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R78.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R78.9 as a principal diagnosis.
Is R78.9 a CC or MCC?
- No. R78.9 is neither a CC nor an MCC under MS-DRG v44.0.