E79 vs M1A
E79 (Disorders of purine and pyrimidine metabolism) compared with M1A (Chronic gout), 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 M1A: “gout (M1A.-, M10.-)”
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 | M1AChronic gout | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header Report instead: M1A.00X0, M1A.00X1, M1A.0110, M1A.0111, M1A.0120 |
| Classification | E00-E89 — Endocrine, Nutritional and Metabolic Diseases (E00-E89) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Disorders of purine and pyrimidine metabolism is a non-billable ICD-10-CM category code (E79). | Chronic gout is a non-billable ICD-10-CM category code (M1A). |
| 7th character | — | The appropriate 7th character is to be added to each code from category M1A |
| Use additional code | — | code to identify: Autonomic neuropathy in diseases classified elsewhere (G99.0) Calculus of urinary tract in diseases classified elsewhere (N22) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources