2026 ICD-10-CM Diagnosis Code O89.01Aspiration pneumonitis due to anesthesia during the puerperium

ICD-10-CM Codes›O00-O9A›O85-O92›O89

ICD-10-CM O89.01
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O89.01 is a billable ICD-10-CM diagnosis code for aspiration pneumonitis due to anesthesia during the puerperium. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Aspiration pneumonitis and Complications specified during the puerperium.

Code Identity

ICD-10-CM Code
O89.01
Billable Status
Yes — Valid for Submission
Code Describes
Aspiration pneumonitis due to anesthesia during the puerperium
Short Description
Aspiration pneumonitis due to anesth during the puerperium
Parent Code
O89.0
Pulmonary complications of anesthesia during the puerperium

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO85-O92Complications predominantly related to the puerperium
CategoryO89Complications of anesthesia during the puerperium
This CodeO89.01Aspiration pneumonitis due to anesthesia during the puerperium

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O89.01.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Inhalation
      • stomach contents or secretions
        • due to anesthesia (general) (local) or other sedation
          • postpartum, puerperal
    • Mendelson's syndrome(due to anesthesia)
      • postpartum, puerperal
    • Pneumonitis(acute) (primary)
      • aspiration
        • due to
          • anesthesia
            • during
              • puerperium
    • Pneumonitis(acute) (primary)
      • postanesthetic
        • postpartum, puerperal

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP010
Aspiration pneumonitis
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG027
Complications specified during the puerperium
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Anesthesia

Anesthesia is the use of medicines, called anesthetics, to prevent pain during surgery and other medical procedures. Medicine may be given by injection, inhalation, topical lotion, spray, eye drops, or a skin patch.

The full article covers:

  • What is anesthesia?
  • What is anesthesia used for?
  • What are the types of anesthesia?
  • What are the risks of anesthesia?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert O89.01 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
668.04 Pulm complicat-postpart
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O89.01Overview

Is O89.01 (Pulmonary complications of anesthesia during the puerperium) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report aspiration pneumonitis due to anesthesia during the puerperium on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Who can O89.01 be reported for?

The Medicare Code Editor checks aspiration pneumonitis due to anesthesia during the puerperium against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of O89.01?

Under the General Equivalence Mappings, aspiration pneumonitis due to anesthesia during the puerperium converts to ICD-9-CM 668.04 (pulm complicat-postpart). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.