O99.3 – Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium

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

Non-billable header

ICD-10-CM code O99.3

Code: O99.3 (claims format: O993)
Description: Mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium
Short description: Mental disord and dis of the nervous sys compl preg/chldbrth
Billable: No – use a more specific code below
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

Billable codes under O99.3

O99.3 is a header code and cannot be used on claims. Choose the most specific code:

O99.31 – Alcohol use complicating pregnancy, childbirth, and the puerperiumHeader (more codes below)
O99.32 – Drug use complicating pregnancy, childbirth, and the puerperiumHeader (more codes below)
O99.33 – Tobacco use disorder complicating pregnancy, childbirth, and the puerperiumHeader (more codes below)
O99.34 – Other mental disorders complicating pregnancy, childbirth, and the puerperiumHeader (more codes below)
O99.35 – Diseases of the nervous system complicating pregnancy, childbirth, and the puerperiumHeader (more codes below)

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

Related codes in O99

Frequently asked questions

What is ICD-10 code O99.3?

O99.3 is the ICD-10-CM code for mental disorders and diseases of the nervous system complicating pregnancy, childbirth and the puerperium, in the block O94-O9A (Other obstetric conditions, not elsewhere classified).

Is O99.3 a billable code?

No. O99.3 is a header code with more specific child codes; report one of the billable codes listed above.

What category does O99.3 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.