Summary & Overview
CPT 93998: Unlisted Noninvasive Vascular Diagnostic Procedure
CPT code 93998 represents an unlisted noninvasive vascular diagnostic procedure used to report services that lack a specific CPT descriptor. As an unlisted code, 93998 matters nationally because it permits billing for atypical or novel noninvasive vascular studies performed in a variety of outpatient settings when no precise code exists. This flexibility supports coverage and payment for uncommon tests, but it also creates variability in reimbursement and documentation expectations across payers.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical scope, typical sites of service, and the kinds of noninvasive vascular procedures it covers. The publication outlines common billing and documentation themes for 93998, highlights typical payer considerations for unlisted services, and summarizes what providers should expect in terms of claim review and supplemental documentation requirements.
This national overview equips billing managers, vascular laboratory directors, and revenue cycle staff with context for when 93998 is used, what to document to support medical necessity, and which stakeholders are most commonly involved in coverage decisions. Data not available in the input for payer-specific rates or utilization benchmarks.
Billing Code Overview
CPT code 93998 is an unlisted code used to report noninvasive vascular diagnostic procedures or services that do not have a specific code. It is intended for vascular testing and diagnostic services that fall outside defined CPT descriptors for noninvasive vascular studies.
Service type: Noninvasive vascular diagnostic procedure
Typical site of service: Outpatient vascular laboratory, hospital outpatient department, ambulatory surgical center, or physician office
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with a history of peripheral artery disease, intermittent claudication, and poorly controlled diabetes presents to the vascular laboratory for noninvasive vascular testing to evaluate lower-extremity arterial perfusion. The ordering provider requests diagnostic evaluation after abnormal pulse exam and an ankle-brachial index that is borderline. The vascular technologist obtains a focused history, performs segmental pressures and Doppler waveforms, and completes duplex imaging of the femoral-popliteal segments. The study includes interpretation by a vascular medicine specialist and a written report placed in the medical record. When the specific noninvasive test performed does not have an assigned CPT code or is a unique combination of noninvasive vascular procedures, 93998 is used to report the service.
Typical site of service: outpatient vascular laboratory, hospital-based vascular lab, or ambulatory surgery center. Typical workflow: order entry by clinician → scheduling in vascular lab → patient arrival and consent → technologist-performed noninvasive vascular testing → physician interpretation and report generation → billing using 93998 when no specific CPT exists for the exact procedure performed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the noninvasive vascular procedure required substantially greater effort or complexity than normal and documentation supports medical necessity and additional work. |
26 | Professional component | Use when billing only the physician interpretation/report portion of the noninvasive vascular service separated from the technical component. |
52 | Reduced services | Use when the procedure was partially reduced or not completed as originally planned and documentation explains the reduction. |
53 | Discontinued procedure | Use when the procedure was started but terminated due to extenuating circumstances, with documentation of reason. |
54 | Surgical care only | Use when the billing is for the surgeon’s portion while another provider bills postoperative care (rare for diagnostic vascular tests but applicable in bundled care situations). |
55 | Postoperative management only | Use when billing only for postoperative care related to a vascular intervention while another provider billed the procedure. |
62 | Two surgeons | Use when two surgeons of different specialties report shared responsibility for complex vascular procedures related to diagnostic findings; seldom used solely for diagnostic testing. |
66 | Surgical team | Use when a planned surgical team performs the care related to the vascular diagnosis informed by the diagnostic testing. |
73 | Discontinued outpatient hospital/ambulatory procedure prior to anesthesia | Use when the outpatient noninvasive test was discontinued before start of anesthesia or sedation for a planned outpatient procedure. |
78 | Unplanned return to operating/procedure room after initial procedure for related procedure during postoperative period | Use when an urgent follow-up procedure is required that is related to findings from the diagnostic test. |
PN | Professional component (alternate reporting) | Use when local payor requires the PN designation for the interpretation component; confirm payer-specific guidance. |
PO | Ownership or ordering provider indicator | Use where applicable under specific payer rules to indicate ordering/owning provider relationships. |
TC | Technical component | Use when billing only the technical portion (equipment, technologist) of the noninvasive vascular testing and the physician interpretation is billed separately. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207RH0000X | Vascular Surgery | Commonly interprets vascular diagnostic studies and performs correlated interventions. |
207L00000X | Interventional Cardiology | Interprets peripheral vascular studies when involved in peripheral interventions. |
2084P0800X | Vascular Medicine | Specialists who interpret noninvasive vascular diagnostics in outpatient labs. |
207K00000X | Cardiovascular Disease | May order and interpret peripheral vascular testing in complex patients. |
261QP2300X | Diagnostic Radiology | Interprets vascular imaging and may provide consultative read when duplex/vascular lab interfaces with radiology. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
I73.9 | Peripheral vascular disease, unspecified | Common indication for noninvasive vascular studies to evaluate arterial perfusion and guide management. |
I70.213 | Atherosclerosis of native arteries of extremities with intermittent claudication, bilateral legs | Typical presentation prompting noninvasive arterial evaluation for severity and location of disease. |
E11.51 | Type 2 diabetes mellitus with peripheral angiopathy without gangrene | Diabetes increases risk of peripheral vascular disease; testing assesses limb perfusion and wound healing potential. |
R02 | Gangrene, not elsewhere classified | Evaluation of arterial supply is critical in limb-threatening ischemia; noninvasive testing informs urgency of intervention. |
I87.2 | Venous insufficiency (chronic) | Noninvasive vascular testing may include venous assessments; 93998 applies when procedures lack specific codes. |
M79.601 | Pain in right leg | Symptom prompting vascular testing when vascular etiologies such as claudication are considered. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
93922 | Limited bilateral noninvasive physiologic studies of upper or lower extremity arteries; including ankle/brachial indices when limited | Commonly performed alongside 93998 when a limited physiologic arterial study is indicated; may be used when specific segments are measured. |
93923 | Complete bilateral noninvasive physiologic studies of upper or lower extremity arteries; includes ankle/brachial indices | Used for full physiologic arterial assessment; 93998 is used only when the performed service lacks a specific code. |
93925 | Duplex scan of lower extremity arteries, single segment, real-time with image documentation | Performed when an anatomic duplex image is obtained for a specific arterial segment; 93998 used when the exact combination of duplex and physiologic testing lacks a specific code. |
93970 | Duplex scan of extremity veins (nonlaboratory) complete bilateral study | Venous duplex studies are often performed in the same vascular lab visit; 93998 would be used for unusual or uncoded noninvasive vascular procedures. |
76937 | Ultrasound guidance for vascular access | May be performed before invasive vascular procedures that follow diagnostic noninvasive testing documented by 93998. |