E79 vs N20.0
E79 (Disorders of purine and pyrimidine metabolism) compared with N20.0 (Calculus of kidney), 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. E79 carries an Excludes1 note covering N20.0: “calculus of kidney (N20.0)”
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
| E79Disorders of purine and pyrimidine metabolism | N20.0Calculus of kidney | |
|---|---|---|
| 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 | Disorders of purine and pyrimidine metabolism is a non-billable ICD-10-CM category code (E79). | Calculus of kidney is a billable ICD-10-CM diagnosis code (N20.0). |
| Includes | — | Nephrolithiasis NOS Renal calculus Renal stone Staghorn calculus |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources