The parathyroid glands control the amount and uses of calcium and phosphate in the body.

Code 7904: Hyperparathyroidism occurs when the parathyroid gland produces too many hormones. There are two kinds of hyperparathyroidism: primary and secondary. Primary is a result of the glands themselves malfunctioning. This kind has very few symptoms but can include symptoms like depression, fatigue, bone pain, and muscle soreness. Secondary is a result of low Vitamin D levels. Symptoms include bone conditions like osteomalacia.

If there is hypercalcemia (too much calcium in the blood), it is rated 60%. To qualify as hypercalcemia, one or more of the following must be present:

• the total calcium level must be greater than 12 mg/dL (3-3.5 mmol/L)
• the ionized calcium level greater than 5.6 mg/dL (2-2.5 mmol/L)
• the creatinine clearance less than 60 mL/min
• the bone mineral density T-score less than 2.5 SD (below the mean)

This 60% rating will continue for 6 months after treatment begins or until surgery is performed, if indicated. If surgery is performed, a 100% rating will be given and will continue for the first 6 months following the surgery. After the 6-month period following either surgery or other treatment, any remaining symptoms (like kidney stones, vision problems, heart problems, etc.) will be rated separately under the appropriate codes unless they are covered by the 10% rating below.

A 10% rating is given if symptoms including nausea, anorexia, fatigue, or constipation are present despite surgery, or if constant medication is required to control the symptoms and surgery cannot be performed.

A 0% rating is given if there are no symptoms.

Code 7905: Hypoparathyroidism occurs when the parathyroid glands produce too few hormones. This causes low levels of calcium in the blood and can cause symptoms like cramping, muscle aches, muscle twitches, headaches, and fatigue. This condition can occur as a side effect from thyroid surgery.

This condition is rated 100% for the first 3 months after diagnosis. It is then rated on any remaining symptoms, like kidney stones, cataracts, congestive heart failure, or any decrease in renal function.