O15.0 ICD-10-CM Code: Eclampsia complicating pregnancy

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for O15.0 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on O15.0 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for O15.0

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

Before you code O15.0

1. O15.0 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

   ReviewO15.00, O15.02, O15.03

   See the relationships section · Guide: How to choose an ICD-10-CM code →

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 →

Choose the right path

1. Does the documentation support one of the more specific codes beneath O15.0?
   Yes → Select that code and continue the checks below on its own page.
   No → O15.0 cannot be reported as written; query for the specificity its subcategory needs.

   ReviewO15.00, O15.02, O15.03

Consider O15.0. 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).

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 O15.0 with…

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

The codes most likely to be picked instead of O15.0 — 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.

• O15.9— 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 “Eclampsia, unspecified as to time period” takes O15.9; specificity in the record moves it back here.

  Full comparison: O15.0 vs O15.9 →

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.

Verify Before Coding

• Not billable as written — a more specific code is required: O15.00, O15.02, O15.03.

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 O15.0 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: I10 — Essential (primary) hypertension (via O15.-).

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

Referenced by 8 Excludes2 notes across 2 chapters: I10-I1A — Hypertensive diseases (I10-I1A) (via O15.-), I11 — Hypertensive heart disease (via O15.-), I12 — Hypertensive chronic kidney disease (via O15.-), I13 — Hypertensive heart and chronic kidney disease (via O15.-), I15 — Secondary hypertension (via O15.-), I16 — Hypertensive crisis (via O15.-), I1A — Other hypertension (via O15.-), O99.4 — Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium (via O15.-).

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

Referenced by 1 Code Also instruction: I16.1 — Hypertensive emergency (via O15.-).

These codes suggest coding this condition alongside when both are present.

Contextual Map

Every relationship of O15.0 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 O15.0 with these 10 related codes in Claim Check

Hierarchy

• O00-O9A — Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A) (O00-O9A)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O10-O16 — Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• I10 — Essential (primary) hypertension[Excludes1](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• I10-I1A — Hypertensive diseases (I10-I1A)[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I11 — Hypertensive heart disease[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I12 — Hypertensive chronic kidney disease[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I13 — Hypertensive heart and chronic kidney disease[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I15 — Secondary hypertension[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I16 — Hypertensive crisis[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I1A — Other hypertension[Excludes2](via O15.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• O99.4 — Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium[Excludes2](via O15.-): “hypertensive disorders (O10-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

• I16.1 — Hypertensive emergency[Code Also](via O15.-): “eclampsia (O15.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Nearest codes

• O15 — Eclampsia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.00 — Eclampsia complicating pregnancy, unspecified trimester[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.02 — Eclampsia complicating pregnancy, second trimester[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.03 — Eclampsia complicating pregnancy, third trimester[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.1 — Eclampsia complicating labor[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.2 — Eclampsia complicating the puerperium[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• O15.9 — Eclampsia, unspecified as to time period[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history (3)

• FY2017 — Description revised[Change history]— CMS release files (code change ledger) · icd10cm-fy2017
• and 2 more

Common coding questions

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

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O15.0 in its code family, with their registry titles.

• O15 — Eclampsia
• O15.00 — Eclampsia complicating pregnancy, unspecified trimester
• O15.02 — Eclampsia complicating pregnancy, second trimester
• O15.03 — Eclampsia complicating pregnancy, third trimester
• O15.1 — Eclampsia complicating labor
• O15.2 — Eclampsia complicating the puerperium
• O15.9 — Eclampsia, unspecified as to time period

View all codes in the O15 family