2026 ICD-10-CM Diagnosis Code O29.029Pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester

ICD-10-CM Codes›O00-O9A›O20-O29›O29

ICD-10-CM O29.029
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O29.029 is a billable ICD-10-CM diagnosis code for pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as pressure collapse of lung due to anesthesia during pregnancy. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Anesthesia complications during pregnancy.

This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.

Code Identity

ICD-10-CM Code
O29.029
Billable Status
Yes — Valid for Submission
Code Describes
Pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester
Short Description
Pressr collapse of lung due to anesth during preg, unsp tri
Parent Code
O29.02
Pressure collapse of lung due to anesthesia during pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO29Complications of anesthesia during pregnancy
This CodeO29.029Pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O29.029.

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).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Pressure collapse of lung due to anesthesia during pregnancy

Clinical ClassificationClinical

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

CCSR PRG025
Anesthesia complications during pregnancy
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 O29.029 to ICD-9-CMHistory

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

ICD-9-CM
646.80 Preg compl NEC-unspec
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 O29.029Overview

Is O29.029 (Pressure collapse of lung due to anesthesia during pregnancy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does O29.029 group to?

When pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can O29.029 be reported for?

The Medicare Code Editor checks pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester 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 O29.029?

Under the General Equivalence Mappings, pressure collapse of lung due to anesthesia during pregnancy, unspecified trimester converts to ICD-9-CM 646.80 (preg compl NEC-unspec). 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.