Complications of anesthesia during pregnancy (O29) ICD-10-CM
The O29 code range covers complications of anesthesia during pregnancy with 77 ICD-10-CM diagnosis codes. 56 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- maternal complications arising from the administration of a general, regional or local anesthetic, analgesic or other sedation during pregnancy
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
- code, if necessary, to identify the complication
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the O29 Range 77 codes · 56 billable
- O29 Complications of anesthesia during pregnancyNon-billable
- O29.0 Pulmonary complications of anesthesia during pregnancyNon-billable
- O29.01 Aspiration pneumonitis due to anesthesia during pregnancyNon-billable
- O29.011 Aspiration pneumonitis due to anesthesia during pregnancy, first trimester
- O29.012 Aspiration pneumonitis due to anesthesia during pregnancy, second trimester
- O29.013 Aspiration pneumonitis due to anesthesia during pregnancy, third trimester
- O29.019 Aspiration pneumonitis due to anesthesia during pregnancy, unspecified trimester
- O29.02 Pressure collapse of lung due to anesthesia during pregnancyNon-billable
- O29.021 Pressure collapse of lung due to anesthesia during pregnancy, first trimester
- O29.022 Pressure collapse of lung due to anesthesia during pregnancy, second trimester
- O29.023 Pressure collapse of lung due to anesthesia during pregnancy, third trimester
- O29.029 Pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester
- O29.09 Other pulmonary complications of anesthesia during pregnancyNon-billable
- O29.091 Other pulmonary complications of anesthesia during pregnancy, first trimester
- O29.092 Other pulmonary complications of anesthesia during pregnancy, second trimester
- O29.093 Other pulmonary complications of anesthesia during pregnancy, third trimester
- O29.099 Other pulmonary complications of anesthesia during pregnancy, unspecified trimester
- O29.1 Cardiac complications of anesthesia during pregnancyNon-billable
- O29.11 Cardiac arrest due to anesthesia during pregnancyNon-billable
- O29.111 Cardiac arrest due to anesthesia during pregnancy, first trimester
- O29.112 Cardiac arrest due to anesthesia during pregnancy, second trimester
- O29.113 Cardiac arrest due to anesthesia during pregnancy, third trimester
- O29.119 Cardiac arrest due to anesthesia during pregnancy, unspecified trimester
- O29.12 Cardiac failure due to anesthesia during pregnancyNon-billable
- O29.121 Cardiac failure due to anesthesia during pregnancy, first trimester
- O29.122 Cardiac failure due to anesthesia during pregnancy, second trimester
- O29.123 Cardiac failure due to anesthesia during pregnancy, third trimester
- O29.129 Cardiac failure due to anesthesia during pregnancy, unspecified trimester
- O29.19 Other cardiac complications of anesthesia during pregnancyNon-billable
- O29.191 Other cardiac complications of anesthesia during pregnancy, first trimester
- O29.192 Other cardiac complications of anesthesia during pregnancy, second trimester
- O29.193 Other cardiac complications of anesthesia during pregnancy, third trimester
- O29.199 Other cardiac complications of anesthesia during pregnancy, unspecified trimester
- O29.2 Central nervous system complications of anesthesia during pregnancyNon-billable
- O29.21 Cerebral anoxia due to anesthesia during pregnancyNon-billable
- O29.211 Cerebral anoxia due to anesthesia during pregnancy, first trimester
- O29.212 Cerebral anoxia due to anesthesia during pregnancy, second trimester
- O29.213 Cerebral anoxia due to anesthesia during pregnancy, third trimester
- O29.219 Cerebral anoxia due to anesthesia during pregnancy, unspecified trimester
- O29.29 Other central nervous system complications of anesthesia during pregnancyNon-billable
- O29.291 Other central nervous system complications of anesthesia during pregnancy, first trimester
- O29.292 Other central nervous system complications of anesthesia during pregnancy, second trimester
- O29.293 Other central nervous system complications of anesthesia during pregnancy, third trimester
- O29.299 Other central nervous system complications of anesthesia during pregnancy, unspecified trimester
- O29.3 Toxic reaction to local anesthesia during pregnancyNon-billable
- O29.3X Toxic reaction to local anesthesia during pregnancyNon-billable
- O29.3X1 Toxic reaction to local anesthesia during pregnancy, first trimester
- O29.3X2 Toxic reaction to local anesthesia during pregnancy, second trimester
- O29.3X3 Toxic reaction to local anesthesia during pregnancy, third trimester
- O29.3X9 Toxic reaction to local anesthesia during pregnancy, unspecified trimester
- O29.4 Spinal and epidural anesthesia induced headache during pregnancyNon-billable
- O29.40 Spinal and epidural anesthesia induced headache during pregnancy, unspecified trimester
- O29.41 Spinal and epidural anesthesia induced headache during pregnancy, first trimester
- O29.42 Spinal and epidural anesthesia induced headache during pregnancy, second trimester
- O29.43 Spinal and epidural anesthesia induced headache during pregnancy, third trimester
- O29.5 Other complications of spinal and epidural anesthesia during pregnancyNon-billable
- O29.5X Other complications of spinal and epidural anesthesia during pregnancyNon-billable
- O29.5X1 Other complications of spinal and epidural anesthesia during pregnancy, first trimester
- O29.5X2 Other complications of spinal and epidural anesthesia during pregnancy, second trimester
- O29.5X3 Other complications of spinal and epidural anesthesia during pregnancy, third trimester
- O29.5X9 Other complications of spinal and epidural anesthesia during pregnancy, unspecified trimester
- O29.6 Failed or difficult intubation for anesthesia during pregnancyNon-billable
- O29.60 Failed or difficult intubation for anesthesia during pregnancy, unspecified trimester
- O29.61 Failed or difficult intubation for anesthesia during pregnancy, first trimester
- O29.62 Failed or difficult intubation for anesthesia during pregnancy, second trimester
- O29.63 Failed or difficult intubation for anesthesia during pregnancy, third trimester
- O29.8 Other complications of anesthesia during pregnancyNon-billable
- O29.8X Other complications of anesthesia during pregnancyNon-billable
- O29.8X1 Other complications of anesthesia during pregnancy, first trimester
- O29.8X2 Other complications of anesthesia during pregnancy, second trimester
- O29.8X3 Other complications of anesthesia during pregnancy, third trimester
- O29.8X9 Other complications of anesthesia during pregnancy, unspecified trimester
- O29.9 Unspecified complication of anesthesia during pregnancyNon-billable
- O29.90 Unspecified complication of anesthesia during pregnancy, unspecified trimester
- O29.91 Unspecified complication of anesthesia during pregnancy, first trimester
- O29.92 Unspecified complication of anesthesia during pregnancy, second trimester
- O29.93 Unspecified complication of anesthesia during pregnancy, third trimester
About the O29 Code Range
The ICD-10 codes O29 cover complications related specifically to anesthesia administered during pregnancy. These codes provide detailed ways to classify various anesthesia-related risks and adverse events during different pregnancy trimesters.
This section includes codes for pulmonary complications like aspiration pneumonitis (inflammation caused by inhaling stomach contents), pressure collapse of the lung, and other lung-related issues. For heart-related anesthesia problems, codes under O29 also cover cardiac complications, including cardiac arrest and cardiac failure, which may vary by pregnancy trimester. Central nervous system issues such as cerebral anoxia (lack of oxygen to the brain) and other neurological complications are also coded here. Toxic reactions to local anesthesia and complications from spinal or epidural anesthesia—including headaches commonly called "post dural puncture headaches"—are part of this grouping as well. Additionally, this section addresses challenges like failed or difficult intubation during anesthesia and other unspecified anesthesia complications during pregnancy. Recognizing these distinct ICD-10 codes helps accurately document and manage anesthesia-related risks in pregnant patients.
Questions About This Page
How many billable codes are in the O29 range?
Of the 77 codes in this range, 56 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O29 range classify?
The range classifies complications of anesthesia during pregnancy. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
