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O66.8 ICD-10-CM Code: Other specified obstructed labor

Compare with another code for O66.8Check this code on a claim

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

Coding at a Glance

Official instructions
1 use-additional instruction

What these terms mean →

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Use additional codeReport with this code when documented
  • Use additional code to identify cause of obstruction

Where it sits Source: CMS/NCHS

Under:Chapter 15: Pregnancy, Childbirth and the PuerperiumO60-O77 Complications of labor and deliveryO66 Other obstructed labor

CompareCheck ClaimView Related Codes

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 v44, 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 O66.8 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify cause of obstruction

Coder workflow for O66.8

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

Before you code O66.8

  1. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on O66.8; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewO66.0, O66.1, O66.2, O66.3, O66.4, O66.5, O66.6

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  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).
Fetus affected
For multiple gestations, the fetus the condition affects, as documented.
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.
Any detail beyond this code’s title
What the record states that a more specific code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Use Additional Code — after identifying O66.8(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with O66.8 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: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with O66.8?

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.

Don’t confuse O66.8 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of O66.8 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • O66.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Obstructed labor, unspecified” takes O66.9; specificity in the record moves it back here.

    Full comparison: O66.8 vs O66.9 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Other specified obstructed labor is a billable ICD-10-CM diagnosis code (O66.8).

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-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name O66.8 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 1 Excludes1 note: O33 — Maternal care for disproportion (via O66.-).

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

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):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 category (CCSR)

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

O65.8 — Obstructed labor due to other maternal pelvic abnormalities, O65.9 — Obstructed labor due to maternal pelvic abnormality, unspecified, 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, O66.9 — Obstructed labor, unspecified, O68 — Labor and delivery complicated by abnormality of fetal acid-base balance, 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, +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.

O64.8 — Obstructed labor due to other malposition and malpresentation (complicated, by, obstructed labor, due to, footling presentation), O64.9 — Obstructed labor due to malposition and malpresentation, unspecified (complicated, by, obstructed labor, due to, malposition), O65.0 — Obstructed labor due to deformed pelvis (cesarean, abnormal, pelvis, with obstructed labor), O65.1 — Obstructed labor due to generally contracted pelvis (complicated, by, obstructed labor, due to, contracted pelvis), O65.2 — Obstructed labor due to pelvic inlet contraction (complicated, by, obstructed labor, due to, pelvic, contraction, inlet), O65.3 — Obstructed labor due to pelvic outlet and mid-cavity contraction (complicated, by, obstructed labor, due to, pelvic, contraction, outlet), O65.4 — Obstructed labor due to fetopelvic disproportion, unspecified (complicated, by, obstructed labor, due to, fetopelvic disproportion), O65.5 — Obstructed labor due to abnormality of maternal pelvic organs (complicated, by, female genital mutilation), O65.8 — Obstructed labor due to other maternal pelvic abnormalities (complicated, by, obstructed labor, due to, pelvic, abnormality, specified NEC), O65.9 — Obstructed labor due to maternal pelvic abnormality, unspecified (complicated, by, obstructed labor, due to, pelvic, abnormality), 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), O68 — Labor and delivery complicated by abnormality of fetal acid-base balance (complicated, by, fetal, acidosis), 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, hematoma), +168 more

Contextual Map

Every relationship of O66.8 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 O66.8 with this related code in Claim Check

Hierarchy

Referenced by Excludes1 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 · FY2027

Index entries

  • Delivery (childbirth) (labor), complicated, by, dilatation, bladder[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Delivery (childbirth) (labor), complicated, by, obstructed labor, specified NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (11)

Change history

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

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (2)

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.

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 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 — v44 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-derived 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 editorial 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.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "O66.8 — Other specified obstructed labor." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/o66.8-other-specified-obstructed-labor

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Other specified obstructed labor

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, 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 O66.8 in its code family, with their registry titles.

View all codes in the O66 family