ICD-10-CM 2027
ICD-10 code for Homocysteinemia
From the official ICD-10-CM alphabetic index entry “Homocysteinemia”. Page updated September 29, 2026.
About coding Homocysteinemia
The ICD-10-CM code for Homocysteinemia is R79.83 (Abnormal findings of blood amino-acid level).
Within R79.8 (other specified abnormal findings of blood chemistry), R79.83 is specifically for abnormal findings of blood amino-acid level. Related codes cover abnormal blood-gas level (R79.81), elevated C-reactive protein (CRP) (R79.82) and other specified abnormal findings of blood chemistry (R79.89).
Don't report R79.83 together with the conditions in its Excludes1 note: disorders of amino-acid metabolism (E70-E72).
Use an additional code to identify any retained foreign body, if applicable (Z18.-).
Don't confuse with (Excludes1 for R79.83)
Common questions about Homocysteinemia ICD-10 codes
What is the ICD-10 code for Homocysteinemia?
- R79.83 — Abnormal findings of blood amino-acid level.
Is R79.83 billable?
- Yes. R79.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R79.83 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R79.83 as a principal diagnosis.
Is R79.83 a CC or MCC?
- No. R79.83 is neither a CC nor an MCC under MS-DRG v44.0.