Skip to main content

O29.021 ICD-10-CM Code: Pressure collapse of lung due to anesthesia during pregnancy, first trimester

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term · 4 Excludes2 · 1 use-additional code

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

  • MS-DRG 817 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 818 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 819 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)
  • MS-DRG 831 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 832 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 833 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for O29.021 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on O29.021 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

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

Source: inherited from O29

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code, if necessary, to identify the complication

Source: inherited from O29

Coder workflow for O29.021

MedCoder structured workflow — derived from this code’s own official record

Before you code O29.021

  1. O29.021’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

    Guide: Combination codes →

  2. Confirm the condition is documented as complicating the pregnancy, childbirth, or the puerperium, and check the trimester where the code carries one and the fetus character where the category requires it. Chapter 15 codes belong on the maternal record only and take sequencing priority over codes from other chapters. It is the provider’s responsibility to state that a condition is not affecting the pregnancy; the trimester is assigned from the documentation (Guidelines I.C.15.a, I.C.15.a.1, I.C.15.a.3).

    Guide: How to choose an ICD-10-CM code →

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Trimester
Assigned from the documented trimester at the encounter, or the trimester in which the condition developed for inpatient stays (Guidelines I.C.15.a.3).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

Official instructions as workflow

  • Excludes2 — not part of O29.021(4 notes)

    Coding workflow: The conditions named in this note are not included in O29.021. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareO74, O89

    See the official tabular notes · Guidelines I.A.12.b

  • Use Additional Code — after identifying O29.021(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with O29.021 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is O29.021 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with O29.021?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Pressure collapse of lung due to anesthesia during pregnancy, first trimester is a billable ICD-10-CM diagnosis code (O29.021).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • Age-restricted: the Medicare Code Editor lists this as a maternity (age 9-64) diagnosis; other ages are presumed incorrect.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name O29.021 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes1 notes: T41 — Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases (via O29.-), T88.2 — Shock due to anesthesia (via O29.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: T88 — Other complications of surgical and medical care, not elsewhere classified (via O29.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 6 MS-DRGs: DRG 817 (MDC 14), DRG 818 (MDC 14), DRG 819 (MDC 14), DRG 831 (MDC 14), DRG 832 (MDC 14), DRG 833 (MDC 14).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):PRG025 — Anesthesia complications during pregnancy (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Anesthesia complications 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, 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, O29.091 — 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, O29.111 — 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, O29.121 — 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, O29.191 — Other cardiac complications of anesthesia during pregnancy, first trimester, +45 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Collapse”; these codes share that main term but sit in a different category of the Tabular List.

M48.53 — Collapsed vertebra, not elsewhere classified, cervicothoracic region (vertebra, cervicothoracic region), M48.54 — Collapsed vertebra, not elsewhere classified, thoracic region (vertebra, thoracic region), M48.55 — Collapsed vertebra, not elsewhere classified, thoracolumbar region (vertebra, thoracolumbar region), M48.56 — Collapsed vertebra, not elsewhere classified, lumbar region (vertebra, lumbar region), M48.57 — Collapsed vertebra, not elsewhere classified, lumbosacral region (vertebra, lumbosacral region), M48.58 — Collapsed vertebra, not elsewhere classified, sacral and sacrococcygeal region (vertebra, sacrococcygeal region), M80.88 — Other osteoporosis with current pathological fracture, vertebra(e) (vertebra, in, osteoporosis), M84.58 — Pathological fracture in neoplastic disease, other specified site (vertebra, in, neoplasm), M95.0 — Acquired deformity of nose (nose), O08.3 — Shock following ectopic and molar pregnancy (vascular, following ectopic or molar pregnancy), O74.1 — Other pulmonary complications of anesthesia during labor and delivery (lung, pressure due to anesthesiaor other sedation, during labor and delivery), O75.1 — Shock during or following labor and delivery (during or, after labor and delivery), O89.09 — Other pulmonary complications of anesthesia during the puerperium (lung, pressure due to anesthesiaor other sedation, postpartum, puerperal), P29.89 — Other cardiovascular disorders originating in the perinatal period (vascular, newborn), Q16.5 — Congenital malformation of inner ear (labyrinth, membranous), R55 — Syncope and collapse, R57.0 — Cardiogenic shock (cardiovascular), R57.9 — Shock, unspecified (vascular), T67.1 — Heat syncope (heat), T81.10 — Postprocedural shock unspecified (postoperative), +18 more

Contextual Map

Every relationship of O29.021 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run O29.021 with these 3 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 14 — Pregnancy, Childbirth and the Puerperium[MDC crossing]: “Pregnancy, Childbirth and the Puerperium — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 94 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Pressure collapse of lung due to anesthesia during pregnancy, first trimester

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O29.021 in its code family, with their registry titles.

View all codes in the O29 family