Z33.1 Pregnant state, incidental

The ICD-10-CM code for Pregnant state, incidental is Z33.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

21: Factors influencing health status and contact with health services (Z00-Z99)

Section

Z30-Z39: Persons encountering health services in circumstances related to reproduction (Z30-Z39)

Category Z33

4 codes (3 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Z33.1:

• Pregnancy (single) (uterine)
• Pregnancy (single) (uterine) › incidental finding
• Carrier (suspected) of › gestational, pregnant
• Status (post) › pregnancy, incidental
• State (of) › pregnant › incidental

Inclusion Terms

• Pregnancy NOS
• Pregnant state NOS

U.S. Hospital Utilization

• An estimated 1,635 U.S. inpatient stays in 2023 included Z33.1 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 15 codes & sequencing priority; incidental pregnancy Z33.1

1) Codes from chapter 15 and sequencing priority Obstetric cases require codes from chapter 15, codes in the range O00- O9A, Pregnancy, Childbirth, and the Puerperium. Chapter 15 codes have sequencing priority over codes from other chapters. Additional codes from other chapters may be used in conjunction with chapter 15 codes to further specify conditions. Should the provider document that the pregnancy is incidental to the encounter, then code Z33.1, Pregnant state, incidental, should be used in place of any chapter 15 codes. It is the provider’s responsibility to state that the condition being treated is not affecting the pregnancy.

Z33.1 secondary only; obstetric chapter otherwise

Z33.1 Pregnant state, incidental This code is a secondary code only for use when the pregnancy is in no way complicating the reason for visit. Otherwise, a code from the obstetric chapter is required.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)