O99.323

✓ Billable

Drug use complicating pregnancy, third trimester

Pregnancy, childbirth and the puerperium (O00-O9A)

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⚠️ Excludes2

inherited

Rules inherited from parent codes.

O99

• when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)

📋 Code Instructions

inherited

O99.32

• code(s) from F11-F16 and F18-F19 to identify manifestations of the drug use

O99

• code to identify specific condition

Clinical Description

ICD-10-CM code O99.323 represents drug use complicating pregnancy, third trimester. This code falls under the Pregnancy, childbirth and the puerperium (O00-O9A) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.

This is a 7-character code at the 6th level of specificity. This is the most specific code available in this subcategory.

Frequently Asked Questions

What is ICD-10 code O99.323?

ICD-10-CM code O99.323 is "Drug use complicating pregnancy, third trimester". It belongs to the category: Pregnancy, childbirth and the puerperium (O00-O9A).

Is O99.323 a billable ICD-10 code?

Yes, O99.323 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

Can O99.323 be coded with other codes?

O99.323 has 1 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in O99.32

Other codes in the same category that may be relevant for differential coding:

O99.320Drug use complicating pregnancy, unspecified trimester O99.321Drug use complicating pregnancy, first trimester O99.322Drug use complicating pregnancy, second trimester O99.324Drug use complicating childbirth O99.325Drug use complicating the puerperium

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Code Information

CodeO99.323

BillableYes

ParentO99.32

CategoryPregnancy, childbirth and the puerperium (O00-O9A)

Excludes10 rule(s)

Excludes21 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)