ICD-10 Code O99: Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
O99 is an ICD-10 diagnosis entry used to group records related to Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).
What is this code?
ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).
When is it used?
- May be used when a clinician documents other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
- This entry may represent a broader category rather than the most specific billable code.
Code hierarchy
Official coding notes
- conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care
- code to identify specific condition
- when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
- code to identify specific condition
Where you may see this code
You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.
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About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.