CPT code 84702: Quantitative hCG billing guide

Key Takeaways

CPT code 84702 reports a quantitative serum hCG test: it measures the exact hCG level in mIU/mL, unlike CPT 84703, which only confirms presence or absence.

Medicare covers 84702 under NCD 190.27 when medically necessary; the 2026 Clinical Laboratory Fee Schedule rate is approximately $17-$24 depending on geographic locality.

Modifier 91 is required when billing repeat quantitative hCG draws on the same date of service; billing 84702 twice on the same date without modifier 91 is a common denial trigger.

Pabau’s claims management software supports accurate CPT 84702 billing with ICD-10 crosswalk tools, modifier tracking, and electronic claim submission through the Claim.MD clearinghouse.

CPT code 84702 is defined by the American Medical Association (AMA) as: Gonadotropin, chorionic (hCG); quantitative. It sits within the Chemistry Procedures section of the CPT code set and covers the quantitative measurement of human chorionic gonadotropin (hCG) in serum or plasma. The test yields a numeric result expressed in mIU/mL, not a simple positive or negative readout.

Clinical indications: When to use CPT code 84702

Medical necessity for CPT code 84702 depends on a documented clinical indication supported by the ordering provider’s notes. Practices billing OB/GYN EMR software should map each order to one of the approved clinical indications below before the claim leaves the office.

• Pregnancy confirmation: Initial quantitative hCG when a positive qualitative test requires confirmation of gestational age or viability.
• Ectopic pregnancy monitoring: Serial quantitative draws every 48 hours to evaluate appropriate hCG doubling or decline.
• Pregnancy loss / miscarriage monitoring: Repeat quantitative testing to confirm complete resolution of pregnancy tissue.
• Down syndrome prenatal screening: Part of first-trimester combined screening panels (alongside PAPP-A and nuchal translucency ultrasound).
• Gestational trophoblastic disease (GTD): Monitoring hCG after molar pregnancy evacuation or choriocarcinoma treatment.
• Oncology tumor marker: hCG as a tumor marker in testicular germ cell tumors (C62.90) and other hCG-secreting malignancies.
• Fertility treatment monitoring: Tracking hCG during assisted reproductive cycles to confirm implantation and monitor early pregnancy.

Medical necessity and documentation requirements for CPT code 84702

Medicare coverage for CPT code 84702 is governed by NCD 190.27 (Human Chorionic Gonadotropin), published by the Centers for Medicare and Medicaid Services (CMS). Beyond the NCD, each Medicare Administrative Contractor (MAC) publishes a Local Coverage Determination (LCD) that specifies covered diagnoses and frequency limits for their jurisdiction. Claims that cite a diagnosis outside the MAC’s covered list will deny on medical necessity even if NCD 190.27 is satisfied.

Proper insurance eligibility verification before the test is ordered reduces the risk of a medical-necessity denial after the fact. Anthem’s active medical policy CG-LAB-27 is a useful reference for commercial payer expectations.

Documentation that must accompany the claim includes:

• The ordering provider’s written or electronic order with a clinical indication
• The relevant diagnosis or clinical presentation in the progress note
• For serial testing: the clinical rationale for each repeated draw (e.g. ectopic pregnancy surveillance, post-treatment GTD monitoring)
• CLIA certificate number for the performing laboratory
• Date of service, NPI of ordering provider, and NPI of performing laboratory

ICD-10 codes to pair with CPT code 84702

Every CPT 84702 claim requires at least one supporting ICD-10-CM diagnosis code. The table below lists the most commonly paired codes, grouped by clinical indication. Always verify the applicable codes against your MAC’s LCD before submission, as covered diagnoses vary by jurisdiction.

CPT code 84702 vs CPT 84703: Quantitative vs qualitative hCG

Choosing between CPT 84702 and CPT 84703 is the most common coding decision for hCG testing. The distinction is clinical, not administrative: 84702 reports a precise numeric value; 84703 reports only whether hCG is present above a detection threshold. Billing the wrong code generates a mismatched medical-record-to-claim scenario that payers audit.

The rates above are approximate 2026 CLFS figures sourced from fee schedule data and must be verified against the official CMS release for your locality. A complete 2026 lookup is available through the CMS Physician Fee Schedule search tool.

Medicare reimbursement rate and fee schedule for CPT code 84702

CPT code 84702 is reimbursed under the Medicare Clinical Laboratory Fee Schedule (CLFS), not the Physician Fee Schedule. The national limitation amount (NLA) for 2026 is approximately $17-$24, with variation by geographic locality. This figure should be confirmed against the official 2026 CLFS published by CMS, as rates are updated each January. Use the FastRVU 2026 RVU lookup to verify current values for your location.

Processing 84702 payments correctly starts with accurate electronic remittance advice reconciliation. When the ERA shows a CLFS-based adjustment, the allowed amount reflects the NLA for the rendering lab’s locality, not a percentage of billed charges.

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Pabau connects CPT codes, ICD-10 pairings, and modifier rules in one workflow so your 84702 claims go out clean the first time. See how practices use Pabau to reduce lab claim denials.

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Billing modifiers for CPT code 84702

Modifier selection for CPT code 84702 is where claims fail most often on repeat-testing scenarios. The table below covers the four modifiers applicable to this code and the precise condition under which each one applies.

Serial hCG monitoring: Billing multiple CPT 84702 draws in one episode

Serial quantitative hCG monitoring is the most billing-intensive clinical use of CPT code 84702. Ectopic pregnancy protocols typically require draws every 48 hours. GTD follow-up may require weekly monitoring for months. Getting the billing rules wrong on these multi-draw episodes causes systematic denial across the whole series.

The core rule: modifier 91 applies only when 84702 is billed more than once on the same date of service. It does not apply to draws on separate dates. A claim for a Monday draw and a Wednesday draw must list 84702 on each date separately, with no modifier. The good news: each draw is a separately billable event with its own date of service.

• Same date, multiple draws: Bill 84702 for the first draw, then 84702-91 for each subsequent draw on that date. Document in the chart why multiple same-day draws were clinically necessary.
• Different dates: Bill 84702 on each date independently. No modifier 91 needed. Ensure the date of service on each claim matches the actual draw date.
• Frequency limits: Payer-specific. Medicare generally covers medically necessary serial testing; commercial payers may impose per-benefit-period limits. Check the applicable LCD or payer policy before ordering more than three draws per episode.
• Documentation per draw: Each serial test needs its own clinical rationale in the medical record, even if the ordering diagnosis code is the same across draws.

84702 billing guidelines and common claim errors

Understanding medical billing fundamentals is the foundation for clean 84702 claims. Beyond code selection, several process-level errors cause the majority of denials on this code.

• Missing ICD-10 code: The most common denial reason. Every 84702 claim needs at least one covered ICD-10-CM diagnosis. Cross-reference your MAC’s LCD before submitting.
• Incorrect modifier 91 use: Billing modifier 91 for draws on different calendar dates, or omitting it for same-day repeat draws, both trigger denials.
• Modifier 90 omitted: If the physician practice bills for a send-out test processed by a reference laboratory, modifier 90 is required. Omitting it misrepresents the place of service.
• CLIA certificate missing: Medicare requires the performing laboratory’s CLIA number on the claim. A blank or invalid CLIA number auto-denies.
• Ordering provider not enrolled: The ordering provider must be enrolled in Medicare and have an active NPI on the claim. Non-enrolled ordering providers disqualify the claim.

Effective denial management for lab codes starts with a clean claim at submission. Reviewing the clean claim submission checklist before filing reduces first-pass denial rates. Practices also benefit from standardizing superbill documentation so the ICD-10 pairing is captured at the point of care, not reconstructed during billing.

How Pabau supports accurate CPT 84702 billing

Reducing CPT code 84702 denials is partly a workflow problem: the right ICD-10 code, modifier, and clinical documentation need to flow from the clinical encounter into the claim without manual re-entry. Pabau’s claims management software connects the clinical record to the billing workflow so that modifier rules and ICD-10 requirements are applied at the time of claim generation rather than discovered at denial.

Pabau submits claims electronically via the Claim.MD clearinghouse integration, which connects to over 4,000 US payers and supports 837P electronic claims, real-time eligibility verification, and 835 ERA processing. Claims are scrubbed against payer edits before transmission, flagging missing modifiers and unsupported ICD-10 pairings before they become denials.

Billing staff working serial hCG monitoring series benefit from the automated revenue cycle management workflow: each draw date generates its own claim line, with modifier tracking built into the repeat-test billing logic.

The electronic claims via the 837 file format transmit same-day and cross-date serial hCG batches accurately, reducing the manual error rate on multi-draw episodes. Denial responses return as structured laboratory billing compliance data via ERA, giving billing staff actionable CARC denial codes rather than generic rejection notices.

Conclusion

CPT code 84702 denials are almost entirely preventable. The three highest-risk points are: pairing the right ICD-10-CM code to the clinical indication, applying modifier 91 correctly for same-day repeat draws, and ensuring the CLIA certificate and ordering provider NPI are present on every claim line.

Pabau’s integrated billing workflow handles each of these checkpoints automatically, from ICD-10 pairing at the point of order through to ERA reconciliation via Claim.MD. If your practice wants to see how this works in a live environment, book a demo with the Pabau team.

Continue your research

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