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O00.52 ICD-10-CM Code: Cornual ectopic pregnancy with intrauterine pregnancy

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Coding at a Glance

Tabular directives
1 inclusion term · 1 Excludes1 · 1 use-additional code

Code Set: New for FY2027 — not valid before October 1, 2026.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for O00.52 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 O00.52 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.

  • ruptured ectopic pregnancy

Source: inherited from O00

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).

Source: inherited from O00-O08

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code from category O08 to identify any associated complication

Source: inherited from O00

Coder workflow for O00.52

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

Before you code O00.52

  1. O00.52 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).

    ReviewO00.521, O00.522, O00.529

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

  2. O00.52’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 →

  3. 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 →

  4. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with O00.52. 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 one of the more specific codes beneath O00.52?
    Yes → Select that code and continue the checks below on its own page.
    No → O00.52 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewO00.521, O00.522, O00.529

  2. Does the documentation support a condition named in O00.52’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.

    ReviewO31.1, O31.3

Consider O00.52. Then work the Use Additional Code note, and 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).
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

  • Excludes1 — check before selecting O00.52(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with O00.52: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareO31.1, O31.3

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

  • Use Additional Code — after identifying O00.52(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with O00.52 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewO08

    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: Both the condition O00.52 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).

ReviewO31.1, O31.3

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

Coding question: Is O00.52 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 O00.52?

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).

ReviewO08

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

Cornual ectopic pregnancy with intrauterine pregnancy is a non-billable ICD-10-CM category code (O00.52). A more specific billable subcode must be selected for claims submission.

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

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 O00.52 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 20 Excludes1 notes across 6 chapters: G08 — Intracranial and intraspinal phlebitis and thrombophlebitis (via O00.-), K65 — Peritonitis (via O00.-), N70 — Salpingitis and oophoritis (via O00.-), N70-N77 — Inflammatory diseases of female pelvic organs (N70-N77) (via O00.-), N71 — Inflammatory disease of uterus, except cervix (via O00.-), N72 — Inflammatory disease of cervix uteri (via O00.-), N73 — Other female pelvic inflammatory diseases (via O00.-), N74 — Female pelvic inflammatory disorders in diseases classified elsewhere (via O00.-), N75 — Diseases of Bartholin's gland (via O00.-), N76 — Other inflammation of vagina and vulva (via O00.-), N77 — Vulvovaginal ulceration and inflammation in diseases classified elsewhere (via O00.-), O20 — Hemorrhage in early pregnancy (via O00.-), R34 — Anuria and oliguria (via O00.-), R55 — Syncope and collapse (via O00.-), R57 — Shock, not elsewhere classified (via O00.-), T79.0 — Air embolism (traumatic) (via O00.-), T79.1 — Fat embolism (traumatic) (via O00.-), T79.4 — Traumatic shock (via O00.-), T81.1 — Postprocedural shock (via O00.-), T81.7 — Vascular complications following a procedure, not elsewhere classified (via O00.-).

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

Referenced by 18 Excludes2 notes across 4 chapters: D65 — Disseminated intravascular coagulation [defibrination syndrome] (via O00.-), D68 — Other coagulation defects (via O00.-), I26 — Pulmonary embolism (via O00.-), K72 — Hepatic failure, not elsewhere classified (via O00.-), N17 — Acute kidney failure (via O00.-), N17-N19 — Acute kidney failure and chronic kidney disease (N17-N19) (via O00.-), N18 — Chronic kidney disease (CKD) (via O00.-), N19 — Unspecified kidney failure (via O00.-), N30 — Cystitis (via O00.-), N30-N39 — Other diseases of the urinary system (N30-N39) (via O00.-), N31 — Neuromuscular dysfunction of bladder, not elsewhere classified (via O00.-), N32 — Other disorders of bladder (via O00.-), N33 — Bladder disorders in diseases classified elsewhere (via O00.-), N34 — Urethritis and urethral syndrome (via O00.-), N35 — Urethral stricture (via O00.-), N36 — Other disorders of urethra (via O00.-), N37 — Urethral disorders in diseases classified elsewhere (via O00.-), N39 — Other disorders of urinary system (via O00.-).

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

Referenced by 6 Code First instructions: I47 — Paroxysmal tachycardia (via O00.-), I49 — Other cardiac arrhythmias (via O00.-), I50 — Heart failure (via O00.-), I74 — Arterial embolism and thrombosis (via O00.-), I80 — Phlebitis and thrombophlebitis (via O00.-), I82 — Other venous embolism and thrombosis (via O00.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Contextual Map

Every relationship of O00.52 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 O00.52 with these 22 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes (20)

Referenced by Excludes2 notes (18)

  • D65 — Disseminated intravascular coagulation [defibrination syndrome][Excludes2](via O00.-): “abortion or ectopic or molar pregnancy (O00-O07, O08.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • D68 — Other coagulation defects[Excludes2](via O00.-): “coagulation defects complicating abortion or ectopic or molar pregnancy (O00-O07, O08.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I26 — Pulmonary embolism[Excludes2](via O00.-): “pulmonary embolism complicating abortion, ectopic or molar pregnancy (O00-O07, O08.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • K72 — Hepatic failure, not elsewhere classified[Excludes2](via O00.-): “hepatic failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • N17 — Acute kidney failure[Excludes2](via O00.-): “renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • N17-N19 — Acute kidney failure and chronic kidney disease (N17-N19)[Excludes2](via O00.-): “renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • N18 — Chronic kidney disease (CKD)[Excludes2](via O00.-): “renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • N19 — Unspecified kidney failure[Excludes2](via O00.-): “renal failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • and 10 more

Referenced by Code First instructions

  • I47 — Paroxysmal tachycardia[Code First](via O00.-): “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I49 — Other cardiac arrhythmias[Code First](via O00.-): “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I50 — Heart failure[Code First](via O00.-): “heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I74 — Arterial embolism and thrombosis[Code First](via O00.-): “embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I80 — Phlebitis and thrombophlebitis[Code First](via O00.-): “, if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
  • I82 — Other venous embolism and thrombosis[Code First](via O00.-): “abortion, ectopic or molar pregnancy (O00-O07, O08.7)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Nearest codes (40)

Change history

Common coding questions

Can O00.52 be billed directly?

No. O00.52 (Cornual ectopic pregnancy with intrauterine pregnancy) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

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

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. "O00.52 — Cornual ectopic pregnancy with intrauterine pregnancy." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/o00.52-cornual-ectopic-pregnancy-with-intrauterine-pregnancy

Change history

  • Upcoming · effective FY2027 — October 1, 2026
    Will be added to the code set
    Cornual ectopic pregnancy with intrauterine pregnancy
    FY2027 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O00.52 in its code family, with their registry titles.

View all codes in the O00 family