Clinical Context
A 28-year-old pregnant patient at 10–22 weeks gestation presents for prenatal genetic screening. The obstetrician or genetic counselor reviews family history revealing that one parent is a known carrier of a pathogenic variant for cystic fibrosis (CF), spinal muscular atrophy (SMA), beta hemoglobinopathies (including sickle cell disease and beta-thalassemia), or alpha thalassemia. The clinician orders the Unity Fetal Risk Screen™ (0489U) from BillionToOne Laboratory to assess fetal risk using cell-free DNA sequencing. A peripheral maternal blood draw is performed in the outpatient clinic or prenatal laboratory (typical site of service: outpatient laboratory or physician office). The sample is sent to the manufacturer’s laboratory for proprietary analysis. Results report a fetal risk score indicating whether the fetus likely inherited the maternal mutation and whether paternally inherited pathogenic variants are present. Results are reviewed by the ordering clinician; follow-up may include targeted diagnostic testing (amniocentesis or chorionic villus sampling) if a high-risk result is reported. Common payors reviewing claims include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
| Modifier | Description | When to Use |
|---|
00 | Unmodified - standard procedure | When the test is billed without any modifier adjustments. |
| 26 | Professional component | When a separate physician professional component (interpretation) is billed in addition to the technical laboratory component.
| 52 | Reduced services | When the laboratory performs a reduced or partially completed test due to limited sample or other constraints.
| 53 | Discontinued procedure | If the test or specimen processing was discontinued prior to completion for documented clinical reasons.
| TC | Technical component | When billing only the laboratory technical component (specimen processing and analysis) without professional interpretation.
| 22 | Increased procedural services | If unusually complex laboratory work is required beyond the typical algorithm and documentation supports increased work.
| 90 | Reference (outside) laboratory | When the performing laboratory is an outside reference lab and payer requires a modifier indicating reference lab services.
| 91 | Repeat clinical diagnostic laboratory test | When an identical test is repeated on the same day to confirm analytic validity.
| 59 | Distinct procedural service | If a distinct and separate laboratory procedure is performed the same day that is not bundled with 0489U.
| GA | Waiver of liability statement on file (personal) | When patient has signed ABN-like documentation and payer requires notification that the patient accepted financial responsibility.
| Taxonomy Code | Specialty | Notes |
|---|
| 207Q00000X | Maternal and Fetal Medicine | Specialists who frequently order prenatal cell-free DNA tests and interpret risk results. |
| 207L00000X | Obstetrics & Gynecology | Primary obstetric providers ordering prenatal screening in outpatient settings.
| 2080P0202X | Clinical Genetics | Geneticists and genetic counselors who may order and interpret targeted fetal risk sequencing panels.
| 261QM0800X | Molecular Pathology | Laboratory directors and molecular pathologists overseeing sequencing-based assays.
| 2084P0800X | Pathology | Pathologists involved in oversight, interpretation, and reporting of laboratory genetic tests.
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|
O09.892 | Other pre-existing maternal hypertension complicating pregnancy, second trimester | Example maternal condition encountered in prenatal care; coexisting diagnoses commonly appear on prenatal panels when ordering fetal risk screening. |
| Z36.89 | Encounter for antenatal screening of other conditions | Directly relevant as a general screening encounter code used when ordering specialized prenatal genetic screening such as 0489U.
| Z35.0 | Supervision of pregnancy with history of infertility | High-risk prenatal supervision codes commonly accompany advanced genetic screening decisions.
| Z13.79 | Encounter for screening for other genetic and chromosomal anomalies | Used to denote genetic screening encounters including cell-free DNA paternally inherited variant screening.
| Z31.5 | Genetic counseling | When genetic counseling is provided in conjunction with ordering or reviewing results for 0489U.
| R10.9 | Abdominal pain, unspecified | Example symptom entry that may be present in the prenatal record; included commonly in visit documentation alongside screening orders.
| Z34.90 | Encounter for supervision of normal pregnancy, unspecified, third trimester | Routine prenatal supervision codes that may be associated with ordering screening earlier in pregnancy.
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|
81025 | Urinalysis, automated, with microscopy | Performed as part of routine prenatal labs during the same visit where blood for 0489U is collected. |
| 36415 | Collection of venous blood by venipuncture | Standard blood draw code used when obtaining the maternal specimen for the 0489U test.
| 81420 | Molecular pathology procedure, Tier 2 (e.g., targeted genomic sequence analysis) | May be used for other non-proprietary prenatal molecular tests; complements or is used when alternative sequencing assays are performed instead of proprietary PLA codes.
| 88271 | FISH, prenatal, probe combination, each probe set (list separately in report) | Relevant when invasive diagnostic testing (amniocentesis) is performed following a high-risk 0489U result and cytogenetic testing is ordered.
| 76945 | Therapeutic, diagnostic ultrasound guidance for needle placement | Used when invasive diagnostic sampling (amniocentesis or CVS) is performed after abnormal prenatal screening results from 0489U.