Summary & Overview
HCPCS Level II S4021: In Vitro Fertilization Cancelled After Aspiration, Case Rate
HCPCS Level II code S4021 denotes an in vitro fertilization (IVF) cycle that was cancelled after oocyte aspiration, billed as a case rate. This code captures situations in assisted reproductive technology where egg retrieval occurs but the cycle is terminated before completion, which has implications for payment reconciliation, quality reporting, and patient cost-sharing nationally. Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find a concise explanation of what S4021 represents clinically and operationally, plus a national perspective on payer coverage patterns, common billing modifiers, and considerations for claims processing. The publication summarizes available benchmarks and policy-relevant points affecting IVF case-rate billing, clarifies the typical site of service, and highlights areas where payer policy differences commonly arise. Data not available in the input for payer-specific rates or utilization is noted where applicable. This resource is intended to inform billing staff, revenue cycle professionals, and policymakers about the role and reporting of HCPCS Level II code S4021 in assisted reproduction claims.
Billing Code Overview
HCPCS Level II code S4021 describes an in vitro fertilization procedure cancelled after aspiration, case rate. This code represents a bundled payment for an IVF cycle that was terminated after oocyte aspiration was performed but the cycle did not proceed to embryo transfer or completion. The service type is a reproductive medicine procedure related to assisted reproductive technology. The typical site of service is an outpatient surgical or procedural setting where oocyte aspiration (transvaginal egg retrieval) is performed, such as a fertility clinic or ambulatory surgery center.
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Clinical & Coding Specifications
Clinical Context
A typical patient is a 34-year-old woman undergoing a controlled ovarian stimulation cycle for in vitro fertilization (IVF). She presents to an outpatient ambulatory surgery center or hospital-based reproductive medicine unit for transvaginal oocyte aspiration following serial monitoring (ultrasounds and serum estradiol). On the day of aspiration, the patient receives sedation or monitored anesthesia care and oocyte retrieval is performed. After follicular aspiration, the embryology laboratory assesses follicular fluid and reports no recoverable oocytes (for example, empty follicle syndrome or failed retrieval despite adequate stimulation) or a procedural complication necessitates termination of the cycle after aspiration (such as brisk vaginal bleeding, hemodynamic instability, or unexpected anesthesia complication). The procedure is documented as completed through aspiration but the IVF cycle is cancelled post-aspiration and no subsequent fertilization, embryo culture, or embryo transfer occurs. Typical workflow steps include pre-procedure consent and counseling, anesthesia evaluation, monitored anesthesia care or general anesthesia, transvaginal ultrasound-guided follicular aspiration in an ambulatory surgery setting or hospital outpatient department, immediate post-procedure monitoring, notification to the embryology team, and formal cancellation documentation in the medical record noting reason for cancellation and disposition.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
52 | Reduced services | Use when aspiration was attempted but performed in a limited fashion compared with the full procedure due to intraoperative findings. |