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O11.2 ICD-10-CM Code: Pre-existing hypertension with pre-eclampsia, second trimester

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

Coding at a Glance

Tabular directives
2 inclusion terms · 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 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 O11.2 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

Notes without a marker are published on O11.2 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.

  • conditions in O10 complicated by pre-eclampsia
  • pre-eclampsia superimposed pre-existing hypertension

Source: inherited from O11

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code from O10 to identify the type of hypertension

Source: inherited from O11

Coder workflow for O11.2

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

Before you code O11.2

  1. O11.2’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

  • Use Additional Code — after identifying O11.2(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with O11.2 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewO10

    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 O11.2 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 O11.2?

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).

ReviewO10

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 O11.2 with…

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

The codes most likely to be picked instead of O11.2 — 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.

  • O11.9— 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 “Pre-existing hypertension with pre-eclampsia, unspecified trimester” takes O11.9; specificity in the record moves it back here.

    Full comparison: O11.2 vs O11.9 →

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.

Code Overview

Pre-existing hypertension with pre-eclampsia, second trimester is a billable ICD-10-CM diagnosis code (O11.2).

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.
  • MCC as a secondary diagnosis (FY2027). 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 O11.2 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 O11.-).

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

Referenced by 9 Excludes2 notes across 2 chapters: I10-I1A — Hypertensive diseases (I10-I1A) (via O11.-), I11 — Hypertensive heart disease (via O11.-), I12 — Hypertensive chronic kidney disease (via O11.-), I13 — Hypertensive heart and chronic kidney disease (via O11.-), I15 — Secondary hypertension (via O11.-), I16 — Hypertensive crisis (via O11.-), I1A — Other hypertension (via O11.-), O10 — Pre-existing hypertension complicating pregnancy, childbirth and the puerperium (via O11.-), O99.4 — Diseases of the circulatory system complicating pregnancy, childbirth and the puerperium (via O11.-).

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: MCC — Major 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 298 clinically related codes on its CMS exclusion list.

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):PRG020 — Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium (default); CIR008 — Hypertension with complications and secondary hypertension.

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 MCC — 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.

O10.419 — Pre-existing secondary hypertension complicating pregnancy, unspecified trimester, O10.42 — Pre-existing secondary hypertension complicating childbirth, O10.43 — Pre-existing secondary hypertension complicating the puerperium, O10.911 — Unspecified pre-existing hypertension complicating pregnancy, first trimester, O10.912 — Unspecified pre-existing hypertension complicating pregnancy, second trimester, O10.913 — Unspecified pre-existing hypertension complicating pregnancy, third trimester, O10.919 — Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester, O10.92 — Unspecified pre-existing hypertension complicating childbirth, O10.93 — Unspecified pre-existing hypertension complicating the puerperium, O11.1 — Pre-existing hypertension with pre-eclampsia, first trimester, O11.3 — Pre-existing hypertension with pre-eclampsia, third trimester, O11.4 — Pre-existing hypertension with pre-eclampsia, complicating childbirth, O11.5 — Pre-existing hypertension with pre-eclampsia, complicating the puerperium, O11.9 — Pre-existing hypertension with pre-eclampsia, unspecified trimester, O12.00 — Gestational edema, unspecified trimester, O12.01 — Gestational edema, first trimester, O12.02 — Gestational edema, second trimester, O12.03 — Gestational edema, third trimester, O12.04 — Gestational edema, complicating childbirth, O12.05 — Gestational edema, complicating the puerperium, +277 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Hypertension and hypertensive-related conditions complicating pregnancy; childbirth; and the puerperium, Hypertension with complications and secondary hypertension).

O10.419 — Pre-existing secondary hypertension complicating pregnancy, unspecified trimester, O10.42 — Pre-existing secondary hypertension complicating childbirth, O10.43 — Pre-existing secondary hypertension complicating the puerperium, O10.911 — Unspecified pre-existing hypertension complicating pregnancy, first trimester, O10.912 — Unspecified pre-existing hypertension complicating pregnancy, second trimester, O10.913 — Unspecified pre-existing hypertension complicating pregnancy, third trimester, O10.919 — Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester, O10.92 — Unspecified pre-existing hypertension complicating childbirth, O10.93 — Unspecified pre-existing hypertension complicating the puerperium, O11.1 — Pre-existing hypertension with pre-eclampsia, first trimester, O11.3 — Pre-existing hypertension with pre-eclampsia, third trimester, O11.4 — Pre-existing hypertension with pre-eclampsia, complicating childbirth, O11.5 — Pre-existing hypertension with pre-eclampsia, complicating the puerperium, O11.9 — Pre-existing hypertension with pre-eclampsia, unspecified trimester, O13.1 — Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester, O13.2 — Gestational [pregnancy-induced] hypertension without significant proteinuria, second trimester, O13.3 — Gestational [pregnancy-induced] hypertension without significant proteinuria, third trimester, O13.4 — Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirth, O13.5 — Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating the puerperium, O13.9 — Gestational [pregnancy-induced] hypertension without significant proteinuria, unspecified trimester, +81 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Partial Thromboplastin Time (PTT) Test, Pregnancy Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of O11.2 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 O11.2 with these 9 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

  • I10 — Essential (primary) hypertension[Excludes1](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Excludes2 notes (9)

  • I10-I1A — Hypertensive diseases (I10-I1A)[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I11 — Hypertensive heart disease[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I12 — Hypertensive chronic kidney disease[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I13 — Hypertensive heart and chronic kidney disease[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I15 — Secondary hypertension[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I16 — Hypertensive crisis[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I1A — Other hypertension[Excludes2](via O11.-): “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • O10 — Pre-existing hypertension complicating pregnancy, childbirth and the puerperium[Excludes2](via O11.-): “pre-existing hypertension with superimposed pre-eclampsia complicating pregnancy, childbirth and the puerperium (O11.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • and 1 more

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

Nearest codes

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 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 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

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. "O11.2 — Pre-existing hypertension with pre-eclampsia, second trimester." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/o11.2-pre-existing-hypertension-with-pre-eclampsia-second-trimester

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Pre-existing hypertension with pre-eclampsia, second trimester

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 O11.2 in its code family, with their registry titles.

View all codes in the O11 family