76830

Ultrasound, transvaginal

Transvaginal ultrasound (TVUS), designated by CPT code 76830, is a specialized diagnostic imaging procedure used to visualize the female pelvic organs with high resolution. Unlike a transabdominal ultrasound, which transmits sound waves through the abdominal wall and requires a full bladder for visualization, the transvaginal approach involves the insertion of a high-frequency transducer directly into the vaginal vault. This proximity to the uterus, ovaries, and adnexa significantly reduces the distance the ultrasound waves must travel and eliminates interference from bowel gas or abdominal fat, resulting in superior image quality of the internal reproductive structures. The procedure is foundational in gynecology for assessing the endometrial thickness, identifying uterine leiomyomas (fibroids), evaluating ovarian morphology (including the presence of cysts or follicles), and detecting ectopic pregnancies or pelvic inflammatory disease. During the exam, the physician or sonographer captures multiple images in sagittal and transverse planes to provide a comprehensive three-dimensional understanding of pelvic anatomy. It is an essential tool for investigating the etiology of abnormal uterine bleeding, chronic pelvic pain, and infertility. In a non-obstetric context, it is frequently used to monitor the response of the endometrium to hormonal therapy or to screen for malignancies in postmenopausal women with bleeding. The procedure is generally well-tolerated and does not involve the use of ionizing radiation, making it safe for repeated use in clinical monitoring.

Clinical Indications

  • Evaluation of abnormal uterine bleeding (AUB)
  • Assessment of postmenopausal bleeding
  • Evaluation of pelvic pain or pressure
  • Screening for and monitoring of ovarian cysts or masses
  • Diagnosis and localization of uterine fibroids (leiomyomas)
  • Infertility workup and monitoring of follicular development
  • Localization of an intrauterine device (IUD)
  • Evaluation of suspected ectopic pregnancy
  • Assessment of pelvic inflammatory disease (PID) or tubo-ovarian abscess
  • Measurement of endometrial thickness in patients on Tamoxifen

Procedure Steps

  1. The patient is instructed to empty their bladder completely prior to the exam.
  2. The patient is positioned in the lithotomy position on an examination table with their feet in stirrups.
  3. A sterile, disposable cover is placed over the high-frequency transvaginal transducer.
  4. A small amount of acoustic coupling gel is applied to the tip of the transducer cover.
  5. The transducer is gently inserted into the vagina, typically by the sonographer or the patient themselves.
  6. The transducer is manipulated (rotated and tilted) to visualize the uterus in its entirety, including the cervix and fundus.
  7. The endometrial stripe thickness is measured and recorded in a sagittal view.
  8. The right and left ovaries are identified and measured in three dimensions.
  9. The adnexal regions are scanned to check for free fluid or extra-ovarian masses.
  10. Permanent images and video loops are recorded for the final diagnostic report.
  11. The transducer is removed, and the patient is provided with materials to clean any residual gel.

Coding Guidelines

  • CPT 76830 is used for non-obstetric transvaginal ultrasound. For transvaginal ultrasound performed on a pregnant uterus, see CPT 76817.
  • If both a transabdominal (76856) and a transvaginal (76830) ultrasound are performed during the same session, both codes may be reported with modifier 59 or XS if required by the payer to indicate distinct procedures.
  • Use modifier 26 to report the professional component (interpretation and report) if the procedure is performed in a facility setting.
  • Use modifier TC to report the technical component (equipment and staff) if billing for the facility or independent diagnostic testing facility (IDTF).
  • Do not report 76830 in conjunction with 76831 (saline infusion sonohysterography) for the same imaging session unless specifically allowed by NCCI edits.
  • Documentation must include a permanent record of images and a written report containing descriptions of the uterus, ovaries, and adnexa.

Associated ICD-10 Codes