O29.019 Aspiration pneumonitis due to anesthesia during pregnancy, unspecified trimester

Billable ICD-10-CM code, FY2026.

Applies from O29 Complications of anesthesia during pregnancy

Includes

• maternal complications arising from the administration of a general, regional or local anesthetic, analgesic or other sedation during pregnancy

Excludes2 (not included here)

• complications of anesthesia during labor and delivery (O74.-)
• complications of anesthesia during the puerperium (O89.-)

Use additional code

• code, if necessary, to identify the complication

Applies from O29.01 Aspiration pneumonitis due to anesthesia during pregnancy

Applicable to

• Inhalation of stomach contents or secretions NOS due to anesthesia during pregnancy
• Mendelson's syndrome due to anesthesia during pregnancy

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 646.80 Other specified complications of pregnancy, unspecified as to episode of care or not applicable (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O29.019

Back-references to O29

• Type 2 Excludes: J12 Viral pneumonia, not elsewhere classified ("aspiration pneumonia due to anesthesia during pregnancy (O29)")
• Type 2 Excludes: J18 Pneumonia, unspecified organism ("aspiration pneumonia due to anesthesia during pregnancy (O29)")
• Type 1 Excludes: J95.4 Chemical pneumonitis due to anesthesia ("aspiration pneumonitis due to anesthesia complicating pregnancy (O29)")
• Type 1 Excludes: T41 Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases ("complications of anesthesia during pregnancy (O29.-)")
• Type 2 Excludes: T88 Other complications of surgical and medical care, not elsewhere classified ("complications of anesthesia in pregnancy (O29.-)")
• Type 1 Excludes: T88.2 Shock due to anesthesia ("pregnancy (O29.-)")

Nearby codes

• O29.0 Pulmonary complications of anesthesia during pregnancy
• O29.01 Aspiration pneumonitis due to anesthesia during pregnancy
• 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 (this code)
• O29.02 Pressure collapse of lung due to anesthesia during pregnancy
• 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