Hysterosalpingography (HSG) is a specialized radiologic procedure used to evaluate the uterine cavity and fallopian tubes in women experiencing infertility or recurrent pregnancy loss. This diagnostic test involves the injection of a contrast dye into the uterus while real-time X-ray imaging (fluoroscopy) captures the flow of the dye through the reproductive tract.
HSG helps identify structural abnormalities such as:
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Blocked fallopian tubes
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Uterine fibroids or polyps
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Congenital uterine anomalies (e.g., septate uterus)
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Scar tissue (Asherman’s syndrome)
Given its diagnostic importance, HSG is a commonly performed procedure in reproductive medicine. This article provides an in-depth look at CPT code HSG (74740), the procedure itself, its clinical applications, billing considerations, and more.
CPT Code HSG
2. Understanding CPT Code HSG (74740)
The Current Procedural Terminology (CPT) code for HSG is 74740, defined as:
“Hysterosalpingography, radiologic supervision and interpretation.”
This code covers the radiologist’s role in supervising the procedure and interpreting the images. However, the actual catheter insertion and contrast administration may involve an additional CPT 58340 (Catheterization and introduction of saline or contrast material for saline infusion sonohysterography or hysterosalpingography).
Key Components of CPT 74740:
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Fluoroscopic guidance
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Contrast medium injection
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Image acquisition and interpretation
CPT Codes Related to HSG
| CPT Code | Description |
|---|---|
| 74740 | Hysterosalpingography, radiologic supervision and interpretation |
| 58340 | Catheterization and contrast injection (if performed separately) |
| 76831 | Saline infusion sonohysterography (alternative to HSG) |
3. Indications for HSG
HSG is primarily ordered for:
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Infertility evaluation (to check tubal patency)
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Recurrent miscarriages (assessing uterine abnormalities)
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Post-tubal ligation or reversal assessment
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Post-surgical evaluation (after myomectomy or adhesiolysis)
4. Contraindications and Risks
Contraindications:
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Active pelvic infection (risk of spreading infection)
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Pregnancy (due to radiation exposure)
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Severe iodine allergy (if using iodinated contrast)
Potential Risks:
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Mild cramping (common)
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Vaginal spotting
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Infection (rare but serious)
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Allergic reaction to contrast
5. Pre-Procedure Preparation
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Performed 7-10 days after menstruation (to avoid pregnancy interference)
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Prophylactic antibiotics may be prescribed for high-risk patients
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Pain management (NSAIDs before the procedure)
6. Step-by-Step HSG Procedure
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Patient Positioning: Lithotomy position.
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Speculum Insertion: Cervix is visualized.
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Catheter Placement: A thin tube is inserted into the uterus.
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Contrast Injection: Dye flows into the uterus and tubes.
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Fluoroscopic Imaging: X-rays track dye movement.
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Post-Procedure Monitoring: Brief observation for adverse reactions.
7. Interpreting HSG Results
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Normal Findings: Dye spills freely from both tubes.
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Abnormal Findings:
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Blocked tubes (no spillage)
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Uterine filling defects (polyps, fibroids)
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Hydrosalpinx (fluid-filled dilated tube)
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8. HSG vs. Other Fertility Tests
| Test | Purpose | Advantages | Disadvantages |
|---|---|---|---|
| HSG | Evaluates tubes & uterus | Minimally invasive, quick | Radiation exposure |
| Sonohysterography | Uterine cavity check | No radiation | Doesn’t assess tubes |
| Laparoscopy | Direct visualization | Gold standard | Surgical risks |
9. Billing and Coding for HSG (CPT 74740)
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Modifier Use:
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-26 (Professional component only)
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-TC (Technical component only)
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Documentation Requirements:
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Medical necessity (e.g., infertility diagnosis)
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Contrast type used
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10. Insurance Coverage and Reimbursement
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Most insurers cover HSG for infertility workup.
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Prior authorization may be required.
11. Frequently Asked Questions (FAQs)
Q1: How painful is an HSG?
Most women experience mild to moderate cramping, similar to menstrual pain.
Q2: Can HSG improve fertility?
Some studies suggest a slight fertility boost due to tubal flushing.
Q3: How long does an HSG take?
The procedure itself lasts about 10-15 minutes.
12. Conclusion
HSG (CPT 74740) is a vital diagnostic tool in reproductive medicine, assessing uterine and tubal health. Proper coding, patient preparation, and interpretation ensure accurate diagnosis and insurance reimbursement. With advancements in imaging, HSG remains a cornerstone of fertility evaluations.
