A34 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupA34

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other bacterial diseases (A30-A49)

A34

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Obstetrical tetanus

Tetanus infection that develops in a pregnant woman or during the postpartum period, typically from contamination of the birth canal or delivery wounds. This is a serious bacterial infection caused by toxins from Clostridium tetani that can affect both mother and fetus.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Context needed

HCC 003

Conditional HHS-HCC mapping: HCC 003 when 9 <= age <= 64. Select the member context before showing a coefficient reference. Metal level and model segment are required for coefficients; no single RAF is shown.

Coefficient needs member context

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

A3Other bacterial diseases (A30-A49)A34Obstetrical tetanus

Inclusion Terms

Official

No inclusion terms are included in this display for A34. Check the code and parent instructions in the Code Book.

Excludes 2

Official

carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99
infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99
influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99

Related Codes

Official

No related codes are included in this display for A34. Check the Code Book for the complete code path.

Includes

Official

diseases generally recognized as communicable or transmissibleInherited from A00-B99

Excludes 1

Official

certain localized infections - see body system-related chaptersInherited from A00-B99

Code First

Official

No Code First sequencing instructions are included in this display for A34. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99

Code Also

Official

No Code Also instructions are included in this display for A34. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

A34 is specific to obstetrical tetanus and should only be used for pregnant women, women in labor, or postpartum women; do not use for non-pregnant patients with tetanus

This code should be used as a secondary diagnosis when coding obstetrical cases; ensure the pregnancy status is also coded with appropriate O-codes (O00-O9A range) to capture the complete clinical picture

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is A34 an HCC code?

Code: A34
Description: Obstetrical tetanus
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

Coder workflow notes

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What This Code Means

A34 is the ICD-10-CM diagnosis code for obstetrical tetanus. Tetanus infection that develops in a pregnant woman or during the postpartum period, typically from contamination of the birth canal or delivery wounds. This is a serious bacterial infection caused by toxins from Clostridium tetani that can affect both mother and fetus. A34 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).

A34 has no mapping under the current CMS-HCC V28 community payment model. A34 also appears in the HHS-HCC commercial risk model (HCC 003 (HHS-HCC 003 adult, RAF varies by metal level)), where the result depends on member context and is not a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

A34 is specific to obstetrical tetanus and should only be used for pregnant women, women in labor, or postpartum women; do not use for non-pregnant patients with tetanus.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for A34 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•A34 is specific to obstetrical tetanus and should only be used for pregnant women, women in labor, or postpartum women; do not use for non-pregnant patients with tetanus
•This code should be used as a secondary diagnosis when coding obstetrical cases; ensure the pregnancy status is also coded with appropriate O-codes (O00-O9A range) to capture the complete clinical picture

Code Hierarchy

└A34Obstetrical tetanus

A34 ICD-10-CM Code: Obstetrical tetanus

HCC Buddy Code Card

A34

Is A34 an HCC code?

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What This Code Means

Coding Tips

Code Hierarchy

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