O99.353 – Diseases of the nervous system complicating pregnancy, third trimester

ICD-10-CM 2027 diagnosis code · Other obstetric conditions, not elsewhere classified

Billable code

ICD-10-CM code O99.353

Code: O99.353 (claims format: O99353)
Description: Diseases of the nervous system complicating pregnancy, third trimester
Short description: Diseases of the nervous sys comp pregnancy, third trimester
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O94-O9A Other obstetric conditions, not elsewhere classified
Parent codes: O99 › O99.3 › O99.35

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

O99 – Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

Includes:

conditions which complicate the pregnant state, are aggravated by the pregnancy or are a main reason for obstetric care

Excludes2 (not included here):

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

Use additional code:

code to identify specific condition

O99.35 – Diseases of the nervous system complicating pregnancy, childbirth, and the puerperium

Applicable to:

Conditions in G00-G99

Excludes2 (not included here):

pregnancy related peripheral neuritis (O26.8-)

Related codes in O99.35

Frequently asked questions

What is ICD-10 code O99.353?

O99.353 is the ICD-10-CM code for diseases of the nervous system complicating pregnancy, third trimester, in the block O94-O9A (Other obstetric conditions, not elsewhere classified).

Is O99.353 a billable code?

Yes. O99.353 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does O99.353 belong to?

It belongs to category O99 – Other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.