A33 — Tetanus neonatorum
Is A33 billable?
Yes — A33 is billable for FY2027. A33 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. A33 may be submitted for encounters from October 1, 2026 through September 30, 2027.
A33 at a glance
| Code | A33 |
|---|---|
| Description | Tetanus neonatorum |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does A33 group to?
A33 sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 794Neonate with Other Significant Problemsmedical
As a secondary diagnosis, A33 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is A33 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to A33. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Omphalitis › tetanus (congenital) (newborn)
- Tetanus, tetanic › neonatorum (cephalic) (convulsions)
- Trismus › neonatorum
- Trismus › newborn
Use additional code — inherited from Chapter 1
Report an additional code alongside A33 to fully describe the condition. A33 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A33, but a patient may have both at the same time. When documentation supports it, A33 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
How long has A33 existed?
A33 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with A33?
ICD-10-CM declares these codes mutually exclusive with A33 — exactly one of each pair can be correct for a given encounter.