A09 vs K52.9
A09 (Infectious gastroenteritis and colitis, unspecified) compared with K52.9 (Noninfective gastroenteritis and colitis, unspecified), 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. A09 carries an Excludes1 note covering K52.9: “colitis NOS (K52.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. A09 carries an Excludes1 note covering K52.9: “enteritis NOS (K52.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. A09 carries an Excludes1 note covering K52.9: “gastroenteritis NOS (K52.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. A09 carries an Excludes1 note covering K52.9: “noninfective gastroenteritis and colitis, unspecified (K52.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. K52.9 carries an Excludes1 note covering A09: “infectious gastroenteritis and colitis NOS (A09)”
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
| A09Infectious gastroenteritis and colitis, unspecified | K52.9Noninfective gastroenteritis and colitis, unspecified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | K00-K95 — Diseases of the Digestive System (K00-K95) |
| Definition | Infectious gastroenteritis and colitis, unspecified is a billable ICD-10-CM diagnosis code (A09). | Noninfective gastroenteritis and colitis, unspecified is a billable ICD-10-CM diagnosis code (K52.9). |
| Includes | Infectious colitis NOS Infectious enteritis NOS Infectious gastroenteritis NOS | noninfective inflammatory bowel disease Colitis NOS Enteritis NOS Gastroenteritis NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources