A34 vs O91
A34 (Obstetrical tetanus) compared with O91 (Infections of breast associated with pregnancy, the puerperium and lactation), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. O91 carries an Excludes2 note covering A34: “obstetrical tetanus (A34)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| A34Obstetrical tetanus | O91Infections of breast associated with pregnancy, the puerperium and lactation | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Obstetrical tetanus is a billable ICD-10-CM diagnosis code (A34). | Infections of breast associated with pregnancy, the puerperium and lactation is a non-billable ICD-10-CM category code (O91). |
| Use additional code | — | code to identify infection |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources