ICD-10 Code O08.3: Shock following ectopic and molar pregnancy

Key Takeaways

ICD-10 Code O08.3 describes shock following ectopic and molar pregnancy, a billable ICD-10-CM code valid for HIPAA-covered transactions.

The FY2026 edition became effective October 1, 2025, under ICD-10-CM Chapter 15 (Pregnancy, Childbirth and the Puerperium).

O08.3 carries no CC/MCC (Complication and Comorbidity) designation under CMS FY2026 (v43.0) Appendix C, though it still maps to MDC 14 for MS-DRG assignment.

Pabau’s claims management software and patient record tools help OB/GYN practices document and submit O08.3 accurately within their billing workflows.

ICD-10 Code O08.3 is a billable ICD-10-CM diagnosis code for shock following ectopic and molar pregnancy, effective in the FY2026 edition since October 1, 2025.

It sits under category O08, and it carries no Complication and Comorbidity (CC) or Major CC (MCC) flag under current CMS tables, though MS-DRG assignment still depends on selecting it over a less specific sibling code.

ICD-10 Code O08.3: Definition and billable status

ICD-10 Code O08.3 is a billable/specific ICD-10-CM diagnosis code used to indicate shock following ectopic and molar pregnancy for reimbursement purposes. It is valid for submission on HIPAA-covered transactions, including outpatient claims filed on the CMS-1500 form.

The code became effective in its FY2026 edition on October 1, 2025, under the American ICD-10-CM classification system.

Because it is a specific (leaf-node) code with no further subdivisions, O08.3 can be used directly on claims without appending an additional character. Coders do not need to select a subcategory code below it.

Clinical definition: Shock following ectopic and molar pregnancy

O08.3 captures circulatory collapse occurring as a direct complication of an ectopic or molar pregnancy, or as a consequence of the procedures used to manage them.

The WHO ICD-10 browser lists two inclusion terms that clarify scope: collapse of the circulatory system following abortion and ectopic and molar pregnancy, and postprocedural shock following abortion and ectopic and molar pregnancy.

In practical terms, this means O08.3 applies when a patient develops hemodynamic instability after a ruptured ectopic pregnancy, after surgical or medical management of a molar pregnancy (hydatidiform mole), or as a post-procedural complication.

Confirming a molar pregnancy diagnosis typically requires histologic examination of the evacuated tissue, billed separately under 88300. Practices providing reproductive or fertility clinic care are among those most likely to encounter this code.

• Collapse of circulatory system following ectopic or molar pregnancy
• Postprocedural shock following management of ectopic or molar pregnancy
• Obstetric shock complicating the O00-O08 abortive outcome section

Note that the ICD-10-CM (US) descriptor specifies “ectopic and molar pregnancy,” while the WHO ICD-10 international version reads “abortion and ectopic and molar pregnancy.”

The only difference is that the WHO version also covers abortion — it doesn’t drop “molar.” The US version is the operative standard for domestic billing and aligns with the American ICD-10-CM guidelines maintained by CDC/NCHS.

ICD-10-CM hierarchy and parent codes

Understanding where O08.3 sits in the hierarchy helps coders identify when a more or less specific code applies. The full path from chapter to code is shown below. Coders working with sibling codes like O07.1 will recognize this chapter-to-category-to-code structure.

The parent category O08 is not itself billable — it serves as the grouping header for all complications following ectopic and molar pregnancy. Claims submitted with O08 alone will be rejected.

The specific subcategory (O08.3 or a sibling code) is required for valid reimbursement. The CMS ICD-10 codes page provides the official tabular list confirming which codes in the O08 category are billable.

Related codes in the O08 category

O08.3 is one of several sibling codes under category O08. Selecting the wrong sibling code is a common coding error because all describe complications following the same pregnancy types. The table below shows the full set of sibling codes in the category to aid differentiation. Coders should also distinguish O08.3 from N96, which covers recurrent pregnancy loss rather than a single complicated episode.

When the documentation specifically identifies shock or circulatory collapse, O08.3 must be used rather than the unspecified O08.9. Using O08.9 when clinical documentation supports O08.3 is under-coding. Although neither code carries a CC/MCC designation under current CMS tables, specificity still matters for clinical accuracy, quality reporting, and audit defensibility.

Approximate synonyms and index references

Coders may encounter different clinical terminology in physician documentation. These synonyms and alternate terms all map to O08.3 in the ICD-10-CM alphabetic index. The AAPC Codify ICD-10-CM lookup can be used to verify these cross-references.

• Collapse of circulatory system following ectopic pregnancy
• Collapse of circulatory system following molar pregnancy
• Postprocedural shock following ectopic and molar pregnancy
• Obstetric shock following ectopic pregnancy
• Obstetric shock following molar pregnancy (hydatidiform mole)

MS-DRG mapping and reimbursement

O08.3 maps to Major Diagnostic Category 14 (MDC 14: Pregnancy, Childbirth and the Puerperium) under the CMS MS-DRG classification system. Under CMS FY2026 (v43.0) Appendix C, O08.3 carries no CC or MCC designation, so reported on its own it does not upgrade a base DRG to a higher-severity variant.

Any DRG severity increase for the encounter would need to come from a different secondary diagnosis that does carry a CC/MCC flag. Facilities using claims management software can automate DRG-impacting code capture to reduce manual review cycles.

Coding guidelines for ICD-10 Code O08.3

Applying ICD-10 Code O08.3 correctly depends on documentation clarity and sequencing logic. Several guidelines govern how O08.3 interacts with other obstetric codes on the same claim.

Practices using patient record documentation tools should ensure the clinical note captures the specific type of complication to support code selection.

Sequencing: Principal vs. secondary diagnosis

Shock is typically a complication of the ectopic or molar pregnancy, not the primary reason for admission. In most inpatient encounters, the ectopic or molar pregnancy code (from the O00-O02 range) is sequenced as the principal diagnosis. O08.3 is then listed as an additional code reflecting the complication that developed.

The exception: if the patient is admitted specifically because of the shock state, with the underlying ectopic or molar pregnancy identified as the cause, coding conventions allow the shock code to be sequenced first. The physician documentation should clearly support whichever condition is designated as the reason for admission.

Present on admission (POA) indicator

For inpatient facility claims, a POA indicator is required. O08.3 is not on the POA exempt list, so coders must assign the appropriate indicator. Use “Y” (present on admission) if shock was documented at the time of admission. Use “N” (not present on admission) if it developed after admission as a postprocedural complication.

An incorrect POA assignment can affect quality metrics and pay-for-performance outcomes. Maintaining accurate HIPAA billing practices includes consistent POA documentation at the point of care.

Documentation requirements

The clinical record must document shock (or circulatory collapse) as a direct complication of an ectopic or molar pregnancy. Documentation of hemodynamic instability, vasopressor use, or a clinical note explicitly stating “shock” or “circulatory collapse” following the relevant pregnancy type all support code assignment.

Without that specificity, coders should query the attending physician rather than default to O08.9. Digital intake tools with clinical forms that prompt clinicians to record complication types at the time of treatment reduce the need for retrospective queries.

Streamline obstetric coding documentation

Pabau helps OB/GYN and reproductive health practices capture the clinical detail that supports accurate ICD-10-CM coding. From digital intake forms to structured clinical notes, the platform keeps your documentation audit-ready.

Book a demo

ICD-11 transition: What changes for O08.3?

Under ICD-11, the WHO ICD-11 browser classifies obstetric complications with shock in the chapter covering conditions related to pregnancy, childbirth, or the puerperium (Chapter 18, codes in the JA range).

The equivalent concept for shock complicating ectopic pregnancy sits within the JA00-JA0Z “Abortive outcome of pregnancy” block, at JA01 (Ectopic pregnancy), with complication qualifiers applied through ICD-11’s post-coordination system.

US practices are not expected to adopt ICD-11 for clinical billing in the near term. CMS has not announced a transition timeline. The current ICD-10-CM O08.3 code remains valid and operative. Coders tracking O04.7 and other O0x-range codes should expect the same shift: ICD-11’s post-coordination logic means a single code will not directly replace any of them at transition.

Conclusion

O08.3 does not carry a CC or MCC designation, so it will not itself raise DRG severity — but coding it accurately is still a straightforward way to avoid under-coding and reduce audit exposure. The code is specific, billable, and well-supported by the ICD-10-CM guidelines — but only when the clinical record explicitly documents shock or circulatory collapse following an ectopic or molar pregnancy.

Pabau’s OB/GYN EMR software includes structured clinical documentation and digital forms that capture the complication specificity coders need to assign O08.3 accurately. If you want to see how it fits into an obstetric billing workflow, book a demo.

Continue your research

Need a structured template for reproductive health consultations? Psychiatric Evaluation Template provides a downloadable framework for structured clinical assessments that support accurate diagnosis coding.

Coding another obstetric complication? O90.9 is the unspecified code for puerperium complications that don’t fit a named category, a frequent source of coding errors in postpartum care.

Billing for devices used during delivery or a related procedure? Y76.8 covers miscellaneous obstetric and gynecological devices associated with a complication, without further specification.

Frequently Asked Questions