E21.3
ICD-10-CMThis code represents an elevated level of parathyroid hormone (PTH) in the blood, leading to hypercalcemia, without further specification of the underlying cause. It indicates an overactive parathyroid gland(s) impacting calcium and phosphate metabolism.
This code is appropriate when documentation confirms hyperparathyroidism but lacks details to specify if it's primary, secondary, or tertiary. It should be used when the physician's diagnosis is simply "hyperparathyroidism" without further elaboration on etiology.
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