Summary & Overview
CPT 3498F: Documentation of CD4+ Percentage ≥15%
Headline: CPT code 3498F: Documentation of CD4+ Percentage ≥15% – Supplemental Tracking
Lead: CPT code 3498F is a supplemental tracking code used to indicate that a patient’s CD4+ cell percentage is 15 percent or higher, capturing an important immunologic marker commonly monitored in HIV care.
CPT code 3498F represents a non-billable supplemental tracking entry that documents a documented laboratory result: a CD4+ cell percentage at or above 15%. Nationally, recording CD4 metrics matters for quality measurement, disease monitoring, and population surveillance in HIV care. Because it is a tracking code, it does not represent a standalone reimbursable service but supports clinical documentation, quality reporting, and care coordination.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical context, typical sites of service, and the role of the code in quality measurement and care documentation. The publication outlines how 3498F is used operationally in electronic health records and claims submissions, highlights implications for reporting and programmatic tracking, and summarizes related administrative considerations.
This content is written for a national audience and focuses on clinical and administrative context rather than state-specific policy.
Billing Code Overview
CPT code 3498F indicates documentation that the patient’s CD4+ cell percentage is 15 percent or higher. This code is a supplemental tracking code used to record laboratory-based immunologic status for patients, typically in the context of HIV care and management.
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Service type: Laboratory result tracking / immunologic monitoring
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Typical site of service: Outpatient clinic, infectious disease or HIV specialty clinic, and outpatient laboratory settings
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Clinical & Coding Specifications
Clinical Context
A patient with known HIV infection attends an outpatient infectious disease clinic for routine laboratory monitoring. The clinician orders a CD4+ lymphocyte percentage to assess immune status as part of ongoing antiretroviral therapy management. A venous blood draw is performed in the clinic or outpatient laboratory, sample is sent to the lab, and the result returns with a CD4+ cell percentage of 15% or higher. The laboratory report is documented in the medical record and supplemental tracking code 3498F is appended to signify that the CD4+ percentage meets or exceeds the 15% threshold for quality reporting or programmatic monitoring. Typical workflow participants include the ordering infectious disease or primary care provider, the phlebotomist or clinic nurse who collects the specimen, the laboratory technologist who performs flow cytometry, and the medical coder who applies 3498F for tracking and reporting purposes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure | Use when an E/M visit is distinct from the laboratory order and documentation supports a separate E/M on the same day. |
59 | Distinct procedural service | Use when billing an unrelated procedure or service on the same day that is not typically bundled with laboratory testing.