ICD-10-CM 2027
ICD-10 code for tetanus omphalitis
From the official ICD-10-CM alphabetic index entry “Omphalitis (congenital) (newborn) › tetanus”. Page updated September 29, 2026.
About coding tetanus omphalitis
The ICD-10-CM code for tetanus omphalitis is A33 (Tetanus neonatorum).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
The Medicare Code Editor expects this diagnosis only for newborns (age 0); reporting it for an older patient triggers an age-conflict edit.
Common questions about tetanus omphalitis ICD-10 codes
What is the ICD-10 code for tetanus omphalitis?
- A33 — Tetanus neonatorum.
Is A33 billable?
- Yes. A33 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can A33 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict A33 as a principal diagnosis.
Is A33 a CC or MCC?
- A33 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.