CPT code 76831: Sonohysterography, saline infusion2026 Medicare rate & RVUs in California

Medicare pays $125.71–$159.78 for 76831 in the office in California, from Chico, CA to San Benito County, CA. Which amount applies depends on the service address.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 76831 covers

During saline infusion sonohysterography, a clinician passes a catheter through the cervix and introduces sterile saline while ultrasound images show the distended uterine cavity. The added fluid helps reveal findings such as an endometrial polyp or submucosal fibroid. Gynecologists commonly perform the procedure in an office or imaging setting; radiology teams may provide the imaging and interpretation. It is used in evaluations of abnormal uterine bleeding and selected infertility workups.

Report 76831 for the ultrasound imaging and interpretation of the cavity during saline infusion. Documentation should support the clinical indication, the infusion and imaging performed, and the findings. Catheterization and saline introduction are represented by 58340 when separately reportable; that code describes the procedural step rather than the ultrasound interpretation. Billing 76831 without a component modifier represents the global service. Modifier 26 identifies the professional interpretation, while modifier TC identifies the technical service. When multiple diagnostic imaging procedures are reported, the applicable multiple procedure reduction applies to both the professional and technical components.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where 76831 pays more and less in California

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

29 of 29 payment localities

How the 76831 rate is calculated

Each of 76831’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 76831

The CMS indicators that decide how 76831 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

76831 compared with similar codes

How to choose

76830Pelvic ultrasoundTransvaginal, nonobstetric

76830 describes transvaginal pelvic ultrasound without saline distention of the uterine cavity. Choose 76831 for ultrasound imaging performed during saline infusion.

76856Pelvic ultrasoundComplete, nonobstetric

76856 is a complete pelvic ultrasound examination, not a saline-infusion study focused on delineating the uterine cavity.

58340Uterine catheterizationFor hysterosalpingography or sonohysterography

58340 represents catheterization and saline introduction; 76831 represents the ultrasound imaging and interpretation during the study.

Codes related to 76831

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates