ICD-10 A33
Billable / Specific MCCTetanus neonatorum
About ICD-10-CM A33
ICD-10-CM code A33 represents Tetanus neonatorum. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A33). The 2026 edition of ICD-10-CM A33 became effective on October 1, 2025.
Coding Tips for A33
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A33 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inpatient DRG Impact, MCC
codes Tetanus neonatorum. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for A33
Local Coverage Determinations (LCDs) from CMS MACs that list A33 as a covered diagnosis.
Showing top 10 of 28 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A33.
1 Medicare
CPT Codes Commonly Billed with A33
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert A33 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| A33 | 7713 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A33
Other codes in section A30-A49 (Other bacterial diseases).
ICD-10 A33, Billing FAQ
Is ICD-10 code A33 billable? +
Yes, A33 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Is A33 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does A33 map to? +
Per CMS GEMs, A33 maps to ICD-9 codes: 7713. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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