E21 vs N64.3
E21 (Hyperparathyroidism and other disorders of parathyroid gland) compared with N64.3 (Galactorrhea not associated with childbirth), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. E21 carries an Excludes1 note covering N64.3: “galactorrhea (N64.3)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| E21Hyperparathyroidism and other disorders of parathyroid gland | N64.3Galactorrhea not associated with childbirth | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | N00-N99 — Diseases of the Genitourinary System (N00-N99) |
| Definition | Hyperparathyroidism and other disorders of parathyroid gland is a non-billable ICD-10-CM category code (E21). | Galactorrhea not associated with childbirth is a billable ICD-10-CM diagnosis code (N64.3). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources