Skip to main content

O68 ICD-10-CM Code: Labor and delivery complicated by abnormality of fetal acid-base balance

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

Coding at a Glance

Tabular directives
4 inclusion terms · 3 Excludes1 · 2 Excludes2

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 998 — PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS (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 O68 in the official ICD-10-CM tabular list, quoted as published.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Fetal acidemia complicating labor and delivery
  • Fetal acidosis complicating labor and delivery
  • Fetal alkalosis complicating labor and delivery
  • Fetal metabolic acidemia complicating labor and delivery

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

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

Coder workflow for O68

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

Before you code O68

  1. 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 →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with O68. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in O68’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewO77.9, O77.8

Consider O68. Then confirm the code is valid for the date of service in the Verify section.

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).

Official instructions as workflow

  • Excludes1 — check before selecting O68(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with O68: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareO77.9, O77.8

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

  • Excludes2 — not part of O68(2 notes)

    Coding workflow: The conditions named in this note are not included in O68. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareO76, O77.0

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

Coding decision scenarios

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

Documentation: Both the condition O68 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewO77.9, O77.8

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

Labor and delivery complicated by abnormality of fetal acid-base balance is a billable ICD-10-CM diagnosis code (O68).

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

Indexed Clinical Terms (8)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • Age-restricted: the Medicare Code Editor lists this as a maternity (age 9-64) diagnosis; other ages are presumed incorrect.
  • CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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 O68 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: O77.8 — Labor and delivery complicated by other evidence of fetal stress, O77.9 — Labor and delivery complicated by fetal stress, unspecified.

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: O76 — Abnormality in fetal heart rate and rhythm complicating labor and delivery.

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.

CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 3 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 1 MS-DRG: DRG 998 (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):PRG024 — Malposition, disproportion or other labor complications (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 process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

O76 — Abnormality in fetal heart rate and rhythm complicating labor and delivery, P03.811 — Newborn affected by abnormality in fetal (intrauterine) heart rate or rhythm during labor

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Malposition, disproportion or other labor complications).

O66.0 — Obstructed labor due to shoulder dystocia, O66.1 — Obstructed labor due to locked twins, O66.2 — Obstructed labor due to unusually large fetus, O66.3 — Obstructed labor due to other abnormalities of fetus, O66.40 — Failed trial of labor, unspecified, O66.41 — Failed attempted vaginal birth after previous cesarean delivery, O66.5 — Attempted application of vacuum extractor and forceps, O66.6 — Obstructed labor due to other multiple fetuses, O66.8 — Other specified obstructed labor, O66.9 — Obstructed labor, unspecified, O69.0XX0 — Labor and delivery complicated by prolapse of cord, not applicable or unspecified, O69.0XX1 — Labor and delivery complicated by prolapse of cord, fetus 1, O69.0XX2 — Labor and delivery complicated by prolapse of cord, fetus 2, O69.0XX3 — Labor and delivery complicated by prolapse of cord, fetus 3, O69.0XX4 — Labor and delivery complicated by prolapse of cord, fetus 4, O69.0XX5 — Labor and delivery complicated by prolapse of cord, fetus 5, O69.0XX9 — Labor and delivery complicated by prolapse of cord, other fetus, O69.1XX0 — Labor and delivery complicated by cord around neck, with compression, not applicable or unspecified, O69.1XX1 — Labor and delivery complicated by cord around neck, with compression, fetus 1, O69.1XX2 — Labor and delivery complicated by cord around neck, with compression, fetus 2, +239 more

Same Index main term, other category

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

O66.3 — Obstructed labor due to other abnormalities of fetus (complicated, by, fetal, deformity), O66.40 — Failed trial of labor, unspecified (cesarean, failed, trial of labor NOS), O66.41 — Failed attempted vaginal birth after previous cesarean delivery (cesarean, failed, trial of labor NOS, following previous cesarean delivery), O66.5 — Attempted application of vacuum extractor and forceps (cesarean, failed, forceps), O66.6 — Obstructed labor due to other multiple fetuses (complicated, by, obstructed labor, due to, multiple fetuses NEC), O66.8 — Other specified obstructed labor (complicated, by, dilatation, bladder), O66.9 — Obstructed labor, unspecified (complicated, by, obstructed labor, due to, dystocia), O67.0 — Intrapartum hemorrhage with coagulation defect (cesarean, hemorrhage, with coagulation defect), O67.8 — Other intrapartum hemorrhage (cesarean, hemorrhage, specified cause NEC), O67.9 — Intrapartum hemorrhage, unspecified (cesarean, hemorrhage), O69.0 — Labor and delivery complicated by prolapse of cord (complicated, by, prolapse, cord), O69.1 — Labor and delivery complicated by cord around neck, with compression (complicated, by, cord, around neck, with compression), O69.2 — Labor and delivery complicated by other cord entanglement, with compression (complicated, by, cord, entanglement), O69.3 — Labor and delivery complicated by short cord (complicated, by, cord, short), O69.4 — Labor and delivery complicated by vasa previa (complicated, by, vasa previa), O69.5 — Labor and delivery complicated by vascular lesion of cord (complicated, by, cord, bruising), O69.81 — Labor and delivery complicated by cord around neck, without compression (complicated, by, cord, around neck, without compression), O69.82 — Labor and delivery complicated by other cord entanglement, without compression (complicated, by, cord, entanglement, without compression), O69.89 — Labor and delivery complicated by other cord complications (complicated, by, cord, complication, specified NEC), O69.9 — Labor and delivery complicated by cord complication, unspecified (complicated, by, cord, complication), +177 more

Contextual Map

Every relationship of O68 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 O68 with these 4 related codes in Claim Check

Hierarchy

Excludes1

Excludes2

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Clinical classification (CCSR)

MS-DRG Grouper

  • CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
  • DRG 998 — PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS[MS-DRG]: “PRINCIPAL DIAGNOSIS INVALID AS DISCHARGE DIAGNOSIS (MDC 14)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

Index entries

  • Delivery (childbirth) (labor), complicated, by, fetal, abnormal acid-base balance[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Delivery (childbirth) (labor), complicated, by, fetal, acidemia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Delivery (childbirth) (labor), complicated, by, fetal, acidosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Delivery (childbirth) (labor), complicated, by, fetal, alkalosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pregnancy (single) (uterine), complicated by (care of) (management affected by), fetal (maternal care for), abnormality or damage, acid-base balance[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pregnancy (single) (uterine), complicated by (care of) (management affected by), fetal (maternal care for), acidemia[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pregnancy (single) (uterine), complicated by (care of) (management affected by), fetal (maternal care for), acidosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pregnancy (single) (uterine), complicated by (care of) (management affected by), fetal (maternal care for), alkalosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

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
    Labor and delivery complicated by abnormality of fetal acid-base balance

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.