83970

Osteocalcin

The CPT code 83970 describes the quantitative measurement of osteocalcin, a non-collagenous protein produced by osteoblasts, in a blood sample (serum or plasma) or other body fluid. Osteocalcin serves as a biochemical marker of bone formation and overall bone turnover. This laboratory test is utilized to assess the rate of bone remodeling, which can be altered in various metabolic bone diseases and in response to treatments for such conditions.

Clinical Indications

  • Monitoring the effectiveness of anti-resorptive and anabolic therapies for osteoporosis.
  • Assessment of bone turnover rates in patients with metabolic bone diseases, such as Paget's disease of bone, primary hyperparathyroidism, or renal osteodystrophy.
  • Evaluation of bone health in individuals at risk for secondary osteoporosis (e.g., due to long-term glucocorticoid therapy, malabsorption syndromes).
  • Diagnosis and differential diagnosis of conditions characterized by abnormal bone metabolism when used in conjunction with other bone markers and clinical findings.

Procedure Steps

  1. Obtain a venous blood sample from the patient (typically serum or plasma).
  2. Process the blood sample by centrifugation to separate the cellular components from the plasma or serum.
  3. Perform quantitative analysis of osteocalcin levels using an appropriate immunoassay method (e.g., ELISA, chemiluminescence immunoassay).
  4. Interpret the results in the context of established reference ranges, patient age, gender, and clinical status.
  5. Report the osteocalcin concentration to the requesting physician.

Coding Guidelines

  • Code 83970 should be reported for the laboratory assay of osteocalcin only once per encounter, regardless of the number of aliquots tested.
  • Documentation in the patient's medical record must clearly support the medical necessity for the osteocalcin assay, including the specific clinical indication or diagnosis.
  • This code should not be reported with more generalized immunoassay codes if the service specifically identifies osteocalcin.
  • Frequency of testing should be clinically appropriate based on the condition being monitored and treatment regimen.
  • Consult payer-specific policies regarding coverage criteria for osteocalcin testing.

Associated ICD-10 Codes