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HomeICD-10 CodesE21
ICD-10-CM
Non-billable

E21

Classification
Category:Endocrine, nutritional and metabolic diseases
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Coding Guidance
E21 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail.
Excludes 1
M83
adult osteomalacia
E34.2
ectopic hyperparathyroidism
E83.81
hungry bone syndrome
E55.0
infantile and juvenile osteomalacia
P70-P74
transitory endocrine and metabolic disorders specific to newborn
Excludes 2
E83.52
familial hypocalciuric hypercalcemia
Use Additional Code
From E00-E89
All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.

More Specific Codes

E21.0
Primary hyperparathyroidism
E21.1
Secondary hyperparathyroidism, not elsewhere classified
E21.2
Other hyperparathyroidism
E21.3
Hyperparathyroidism, unspecified
E21.4
Other specified disorders of parathyroid gland
E21.5
Disorder of parathyroid gland, unspecified

External Resources

2025 ICD-10 guidelines from CMS.gov