E21.1
BillableSecondary hyperparathyroidism, not elsewhere classified
E21.1 is the ICD-10-CM code for Secondary hyperparathyroidism, not elsewhere classified. It is a billable, specific code valid for reimbursement.
E00-E89 Endocrine, nutritional and metabolic diseases
What this means — in plain language
MedlinePlus · NIHMost people have four pea-sized glands, called parathyroid glands, on the thyroid gland in the neck. Though their names are similar, the thyroid and parathyroid glands are completely different. The parathyroid glands make parathyroid hormone (PTH), which helps your body keep the right balance of calcium and phosphorous. If your parathyroid glands make too much or too little hormone, it disrupts this balance. If they…
Read more about Parathyroid Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
Excludes1 — not coded here
- •secondary hyperparathyroidism of renal origin (N25.81)
Frequently asked questions
- What is ICD-10 code E21.1?
- E21.1 is the ICD-10-CM code for "Secondary hyperparathyroidism, not elsewhere classified". It falls under E00-E89 Endocrine, nutritional and metabolic diseases.
- Is E21.1 a billable code?
- Yes — E21.1 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from E21.1?
- Excludes1 (not coded here): secondary hyperparathyroidism of renal origin (N25.81).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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