E21

Hyperparathyroidism and other disorders of parathyroid gland

Not billable — category only FY2026 2025-10-01 → 2026-09-30

Exclusions 8 never code together

E21code

Excludes1

adult osteomalacia (M83.-)M83.-M83.-M83.-
ectopic hyperparathyroidism (E34.2)E34.2 E34.2 E34.2
hungry bone syndrome (E83.81)E83.81 E83.81 E83.81
infantile and juvenile osteomalacia (E55.0)E55.0 E55.0 E55.0

Excludes2

familial hypocalciuric hypercalcemia (E83.52)E83.52 E83.52 E83.52

E20-E35block

Excludes1

galactorrhea (N64.3)N64.3
gynecomastia (N62)N62

E00-E89chapter

Excludes1

transitory endocrine and metabolic disorders specific to newborn (P70-P74)P70-P74

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 1

E00-E89chapter

Notes

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.E05.8 E07.0 E16-E31 E34.-

Index entries leading here filed at null

No alphabetic index entry points at this code.

Subordinate codes 6

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

Medications 4

41 Bipolar and Related Disorders drugs 10 Feeding and Eating Disorders drugs 65 Sleep Initiation and Maintenance Disorders drugs 19 Trauma and Stressor Related Disorders drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

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This code

Billable: no
Code set: FY2026
Block: E20-E35
Subordinate: 6

Present FY2024–FY2027.