S3870 CGH Microarray Reimbursement & Policy

HCPCS Level II code S3870 denotes comparative genomic hybridization (cgh) microarray testing used to evaluate individuals with developmental delay, autism spectrum disorder, and intellectual disability. As a specialized genetic diagnostic laboratory service, this test can identify copy number variants that inform clinical diagnosis, genetic counseling, and care planning. Nationally, genomic microarray testing is an important component of the diagnostic workup for neurodevelopmental disorders and has implications for clinical management and family counseling.

Key payers covered in this review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines payer coverage patterns and benchmarks where available, summarizes relevant policy updates affecting access to microarray testing, and provides clinical context for when S3870 is billed. Readers will gain an understanding of common reimbursement considerations, typical sites of service, and how S3870 fits into the diagnostic pathway for developmental and neurodevelopmental conditions.

Data not available in the input for specific associated taxonomies, ICD-10 diagnoses, and related codes is noted where applicable. The focus is national in scope and intended for healthcare policy analysts, billing professionals, and clinical program managers seeking concise information about HCPCS Level II code S3870 and its role in genomic diagnostics.

Billing Code Overview

HCPCS Level II code S3870 describes comparative genomic hybridization (cgh) microarray testing for developmental delay, autism spectrum disorder and/or intellectual disability. This service represents a genomic diagnostic test that analyzes copy number variations across the genome to identify deletions or duplications that may contribute to neurodevelopmental disorders.

Service type: Genetic diagnostic testing (molecular/genomic laboratory service)

Typical site of service: Clinical diagnostic laboratory or outpatient laboratory setting

Clinical Context

A pediatric patient, age 2–6 years, presents to a genetics clinic for evaluation of global developmental delay and concerns for autism spectrum disorder after delayed speech and social milestones. The clinician documents a detailed history, physical exam, and standardized developmental screening that support the need for genomic testing. After informed consent, a blood specimen is collected in clinic and sent to a reference laboratory for comparative genomic hybridization (CGH) microarray testing (S3870) to detect copy-number variants associated with developmental delay, intellectual disability, and autism spectrum disorder. The clinical workflow includes pre-test counseling by a genetics provider, specimen collection and shipment under chain-of-custody protocols, laboratory analysis with microarray platform, and post-test result interpretation and counseling with recommendations for family testing or referral to specialty services as indicated. Typical site of service is an outpatient genetics clinic, pediatric specialty clinic, or reference laboratory; testing may be ordered by pediatricians, clinical geneticists, neurologists, or developmental-behavioral pediatricians.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when documentation supports substantially greater work than typical for pre-test or post-test counseling by the ordering clinician when billed as a separately reportable service.

Taxonomy Code	Specialty	Notes
207Q00000X	Clinical Genetics	Physicians who order and interpret genetic testing and provide pre/post-test counseling.
207VG0200X	Neurology	Pediatric neurologists who evaluate developmental delay and may order microarray testing.
2080P0206X	Pediatrics	General pediatricians or developmental-behavioral pediatricians who initiate referral and testing.
3336C0002X	Clinical Laboratory	Clinical laboratory directors and laboratory geneticists overseeing microarray testing platforms.
363LF0000X	Genetic Counseling	Certified genetic counselors who provide consent, counseling, and result disclosure.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`F84.0`	Autistic disorder	CGH microarray is indicated to identify genomic copy-number variants associated with autism spectrum disorder.
`F71`	Moderate intellectual disabilities	Array testing helps detect genetic etiologies underlying intellectual disability.
`F82`	Specific developmental disorder of motor function	Used when global developmental concerns prompt genetic evaluation.
`R62.0`	Delayed milestones	Common presenting problem leading to CGH microarray testing.
`R62.50`	Unspecified lack of expected normal physiological development	Broad developmental delay code used when precise classification is pending genetic results.
`F80.0`	Phonological disorder	Speech delays may trigger genetic testing as part of developmental assessment.
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Seizure disorders commonly co-occur with developmental delay and may prompt genetic microarray testing.
`Q93.9`	Chromosomal abnormality, unspecified	Represents known chromosomal findings that microarray testing can detect or further characterize.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`81229`	Chromosomal microarray analysis; interrogating genomic regions for copy number variants (e.g., array CGH, SNP array)	Directly related laboratory test often reported by laboratories for array-based copy-number analysis; may be used by payers instead of or in conjunction with `S3870` depending on billing pathway.
`81025`	Urinalysis by dipstick or tablet reagent for non-automated, with microscopy when appropriate	May be ordered as part of general pretest evaluation or metabolic screening but is ancillary to CGH microarray testing.
`96372`	Therapeutic, prophylactic, or diagnostic injection (specify substance or drug); subcutaneous or intramuscular	Included as an example of an unrelated outpatient procedure; Data not available in the input.
`99000`	Handling and/or conveyance of a specimen for transfer from the doctor’s office to a laboratory	Used when specimen handling or courier fees are billed separately in association with sending blood to a reference lab.
`G0495`	Care management services related to complex chronic care (example)	Used only when billing care management services that may accompany complex diagnostic evaluation; not routinely billed with `S3870`.

OpenPayer

Summary & Overview

HCPCS S3870: CGH Microarray for Developmental Delay, ASD, Intellectual Disability