Radiology Coding Alert

Here’s how to ensure you’re reporting the correct scan types and the right timeframes.

Claims for bone density scans can drain your practice if you neglect details in these simple procedures. You need to be clear for the types of tests, appropriate diagnoses, and acceptable timeframes. These three tips will help you navigate your way to success for strong claims.

1. Report the Correct Type of Scan

Bone density scans (also known as bone mass measurements, or BMM) fall into five general categories. Your first step in coding is to determine the study type and site.

Ultrasound bone scan: You’ll report 76977 (Ultrasound bone density measurement and interpretation, peripheral site[s], any method) when your physician completes a bone scan using ultrasound.

CT bone scan: For a CT bone scan, choose 77078 (Computed tomography, bone mineral density study, 1 or more sites; axial skeleton [e.g., hips, pelvis, spine]). Your physicians use these together with computer software to determine the bone density, usually at the spine. CT is the most sensitive scan to detect bone disease and can take into account other diseases that might affect the bone, such as arthritis, experts say. CT bone scan also is the only commercially available technique to measure three-dimensional bone images.

DEXA scan: Choose from 77080 (Dual-energy X-ray absorptiometry [DXA], bone density study, 1 or more sites; axial skeleton [e.g., hips, pelvis, spine), 77081 (... appendicular skeleton [peripheral] [e.g., radius, wrist, heel]), or77086 (Vertebral fracture assessment via dual-energy X-ray absorptiometry [DXA]) when your physician documents that he performed a DEXA or DXA scan. A DXA scan measures the spine and often one or both hips. It’s more sensitive and accurate than the CT at measuring small changes in bone density over time or in response to drug therapy, experts say.

SEXA scan: Your final category is the SEXA bone density scan. CPT® doesn’t include a code for SEXA scans, so turn to HCPCS for G0130 (Single energy X-ray absorptiometry [SEXA] bone density study, one or more sites; appendicular skeleton [peripheral] [e.g., radius, wrist, heel]).

Before coding any of these or other similar tests, know your payer’s guidelines and file accordingly. For example, Medicare considers 78350 (Bone density [bone mineral content] study, 1 or more sites; single photon absorptiometry) and 78351 (... dual photon absorptiometry, 1 or more sites) not medically reasonable and necessary. Any claim you send to Medicare with these codes is a denial just waiting to happen.

2. Check for Complete Diagnosis Documentation

Medicare and other payers also have guidelines regarding accepted diagnoses to support bone density scans and the patients your physician treats. According to Medicare, a qualified individual must meet at least one of these five indications:

• A woman who is estrogen-deficient (256.39) and at clinical risk for osteoporosis (733.0x)
• An individual with vertebral abnormalities indicative of osteoporosis, osteopenia (733.90, Disorder of bone and cartilage unspecified), or vertebral fracture (805.xx, Fracture of vertebral column without mention of spinal cord injury, or 733.13, Pathologic fracture of vertebrae)
• An individual on glucocorticoid (steroid) therapy equivalent to an average of 5.0 mg of prednisone, or greater, per day, for more than three months (V58.65)
• An individual with primary hyperparathyroidism (252.01)
• A patient who needs monitoring because of osteoporosis drug therapy (such as V58.65, Long-term [current] use of steroids).

Some payers might accept other diagnoses to justify bone density scans, so always check their guidelines. Remember, however, that you’ll always report the most accurate diagnosis based on your physician’s documentation, whether it’s payable or not.

Warning: Choosing a diagnosis code simply because you know you’ll get paid for it, rather than because it is the diagnosis your physician documented, is fraudulent and opens you up to audits and investigation.

3. Verify You’re Within the Timeframe

Turn to the calendar for your final checkpoint for successful bone density claims.

Here’s why: Medicare will pay for bone mass measurements on qualified individuals every two years. “Every two years” means “at least 23 months have passed since the month” of the last bone mass measurement (Medicare Carriers Manual, Part 3, Section 4181.2).

Note: If you can document medical necessity on the patient, Medicare will allow you to bill within the two-year window, but it must be medically necessary. Otherwise, the two-year rule for all “healthy” individuals is a good guideline to follow, experts advise.

Two examples of when earlier tests might be necessary include:

• Monitoring a patient who’s been on glucocorticoid therapy for more than three months
• Needing a baseline measurement to monitor a patient who had an initial test using a different technique than the one your physician wants to use for monitoring her (such as sonometry versus densitometry).