The following bone mineral density (BMD) studies are those most commonly used in the evaluation of osteoporosis, sometimes referred to as osteopenia. This condition might be the result of alcoholism, hyperparathyroidism, malabsorption, chronic renal disease, Cushing's syndrome, etc.

Dual Photon Absorptiometry (DPA) - 78351

DPA is a modification of the single-energy technique using a radioisotope that emits photons at two different energy levels. This method measures the total integrated mineral in the path of the beam.

Quantitative Computed Tomography (QCT) - 76070, G0131, G0132

QCT may be used to measure cancellous bone, cortical bone, or an integrated sum of both. The method can identify the absolute mineral content of a specific volume of bone.

Dual Energy X-ray Absorptiometry (DEXA) - 76075, 76076

DEXA is a two-dimensional projection system similar to DPA except that it uses an x-ray tube for its photon source rather than a radioisotope. DEXA is most commonly used to measure bone mineral of the hip and spine, but measurements may also be taken of the forearm, calcaneus, or the total body.

The above methods are eligible for measuring bone mineral density when testing patients in the following circumstances:

• The patient is on long term steroid therapy (3 month duration or longer with a dosage of 7.5 mg per day of prednisone, or equivalent)
• To determine if significant osteoporosis is present when associated with vertebral abnormalities on x-ray (such as compression fractures) or radiographic evidence of osteopenia
• Fractures of the hip, wrist, or spine in the absence of appropriate severe trauma
• Documented loss of height of greater than 1.5 inches
• To monitor and evaluate response to ongoing restorative treatment (e.g., Fosamax) for patients with documented osteoporosis
• The patient suffers from one of the following calcium-wasting endocrinopathies:
  
  • Cushing's Syndrome
  • Hyperparathyroidism
  • Hyperthyroidism
  • Hypogonadism (except for uncomplicated, naturally occurring, or surgically induced post-menopausal clinical cases)
  • Prolactinoma
  
  

Bone mineral density studies for asymptomatic patients are considered screening and are not covered.

Single energy x-ray absorptiometry (SEXA)(code G0130), and bone sonometry (code 76977) are beyond the investigational stage. However, these methods for assessing bone density are considered to be screening in nature, and as such, are not generally covered unless otherwise specified in the contract.

Bone biopsy provides a qualitative measurement of the bone mineral of trabecular bone and is used primarily to differentiate osteomalacia from osteoporosis. This is an eligible service and should be processed for payment under code 20220.

Single Photon Absorptiometry (SPA)(78350) and Photodensitometry (76078) are methods that are not generally accepted by the medical community as clinically useful in diagnosing or treatment. As such, they are considered to be not medically necessary and are ineligible for payment.

Single Photon Absorptiometry (SPA) is an eligible method for measuring bone mineral density.

In addition to the indications listed above, one bone densitometry or bone mineral measurement, using only one of the four non-invasive technologies (SPA, DPA, QCT, or DEXA), is considered medically necessary for patients where osteoporosis risk is the factor in making the decision to initiate estrogen replacement therapy.

Patients should be:

• Perimenopausal women, when used in making the decision to initiate estrogen replacement therapy based on information regarding the probability of future fractures; or
  
  
• Women deficient in estrogen following menopause, bilateral oophorectomy, or amenorrhea of six months' duration or more.
  

• The patient's bone density has not been previously measured;
  
  
• Estrogen replacement therapy is not contraindicated for the patient;
  
  
• The individual is undecided about estrogen replacement therapy and knowledge of her risk of osteoporosis would be the determining factor in her decision.
  

PRN References

04/1995, Bone mineral density studies
12/1996, Bone mineral density studies
02/2000, Technology for assessing bone density considered screening

The Challenges of Peripheral Bone Density Testing – Which Patients Need Additional Central Density Skeletal Measurements?, Journal of Clinical Densitometry, Vol. 1, No. 3, Fall 1998

Stiffness in Discrimination of Patients with Vertebral Fractures, Osteoporosis International, Vol. 9, 1999