Question 1

What is ICD-10 code O29.011?

Accepted Answer

O29.011 is the ICD-10-CM diagnosis code for aspiration pneumonitis due to anesthesia during pregnancy, first trimester. Aspiration of stomach contents into the lungs causing inflammation as a complication of anesthesia during the first three months of pregnancy. O29.011 sits in the ICD-10-CM chapter for pregnancy, childbirth and the puerperium (o00-o9a), within the section covering other maternal disorders predominantly related to pregnancy (o20-o29).

O29.011 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Always include the trimester code as the fifth character; O29.011 specifically indicates first trimester.

Question 2

Is O29.011 an HCC code?

Accepted Answer

No. O29.011 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is O29.011 billable?

Accepted Answer

Yes. O29.011 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. O29.011 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for O29.011?

Accepted Answer

O29.011 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards O29.011 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting O29.011?

Accepted Answer

Always include the trimester code as the fifth character; O29.011 specifically indicates first trimester Document the relationship between anesthesia administration and the aspiration pneumonitis in the medical record

O29.011

Is O29.011 an HCC code?

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Open O29.011 in the Interactive Encoder