Summary & Overview
CPT 83090: Homocysteine Quantitative Test
Headline: CPT code 83090: Homocysteine Quantitative Test Measures a Metabolic and Cardiovascular Biomarker
Lead: CPT code 83090 represents a quantitative laboratory test for homocysteine, performed on plasma, serum, or urine to evaluate inherited metabolic disorders and cardiovascular risk. The test is widely ordered in clinical chemistry and genetic workups and has national relevance for diagnostic pathways and laboratory billing.
What the code represents and why it matters: CPT code 83090 is billed for laboratory measurement of homocysteine, an amino acid linked to metabolic disorders and cardiovascular disease risk. Homocysteine testing informs diagnosis, therapeutic monitoring, and risk stratification, making it a focal point for laboratory services and payer coverage policies across the country.
Key payers covered: Analysis commonly addresses major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Overview of reader takeaways: Readers will find concise clinical context for the test, typical sites of service, and what to expect in terms of billing classification. The publication outlines benchmark elements relevant to laboratory service lines, summarizes typical clinical uses, and highlights where policy updates or coverage criteria most often affect utilization. Data not available in the input: specific payer coverage rules, reimbursement rates, associated taxonomies, and ICD-10 diagnosis mappings.
Billing Code Overview
CPT code 83090 describes a laboratory measurement of homocysteine concentration, typically performed on plasma, serum, or urine samples. The test quantifies the amount of homocysteine, an amino acid relevant to inherited metabolic disorders and used as a marker in cardiovascular risk assessment.
Service Type: Laboratory testing — quantitative biochemical analysis
Typical Site of Service: Clinical laboratory or hospital laboratory
Clinical & Coding Specifications
Clinical Context
A 52-year-old ambulatory patient with a history of premature coronary artery disease and elevated fasting LDL presents to the outpatient laboratory after referral by their primary care physician for cardiovascular risk stratification. The clinician orders a fasting plasma homocysteine measurement because the patient has a family history of early myocardial infarction and a prior stroke of unclear etiology. The patient fasts overnight; phlebotomy is performed with plasma collected in an EDTA tube, promptly placed on ice, and sent to the clinical chemistry lab. The laboratory analyst performs 83090 testing using a validated assay (e.g., HPLC or mass spectrometry) to quantify total homocysteine. Results are reported to the ordering clinician and entered into the electronic health record; elevated values prompt follow-up for vitamin B12/folate testing and possible genetic/metabolic referral. Typical site of service: outpatient laboratory or hospital clinical laboratory. Service type: quantitative homocysteine assay (laboratory diagnostic test).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician or pathologist professional interpretation of the test if facility bills the technical component separately. |