2027 ICD-10-CM Diagnosis Code Z33.1Pregnant state, incidental
Z33.1 is a billable ICD-10-CM diagnosis code for pregnant state, incidental. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64) and not accepted as a principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Uncomplicated pregnancy, delivery or puerperium.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z33.1.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abdominal pain in early pregnancy
- Abdominal pain in pregnancy
- Antenatal ultrasonography confirms intrauterine pregnancy
- Embryo present in utero
- Exposure to rubella in pregnancy
- Exposure to Rubella virus
- Fears delivery procedure
- Fertilization in vivo
- Fetal viability
- Fetus present
- Finding of device of vagina
- Finding of position of pregnancy
- Finding of vaginal liquor
- Finding of viability of pregnancy
- First trimester pregnancy
- Glucose level within reference range
- Glucose tolerance test within reference range
- Gravid uterus at 12-16 weeks size
- Gravid uterus at 16-20 weeks size
- Gravid uterus at 20-24 weeks size
- Gravid uterus at 24-28 weeks size
- Gravid uterus at 28-32 weeks size
- Gravid uterus at 32-34 weeks size
- Gravid uterus at 34-36 weeks size
- Gravid uterus at 36-38 weeks size
- Gravid uterus at term size
- History of operation on cervix in currently pregnant patient
- History of uterine cervix surgery
- Intends to continue pregnancy
- Intrauterine pregnancy
- IUD failure - pregnant
- Jorissenne sign
- Maternity pad damp with liquor
- Maternity pad soaked with liquor
- Maternity pad wet with liquor
- Nicotine user
- Nicotine user before confirmation of pregnancy
- Precocious pregnancy
- Pregnancy
- Pregnancy after cervical conization
- Pregnancy outside of marriage
- Pregnancy resulting from natural conception
- Pregnancy with normal glucose tolerance test
- Pregnant - blood test confirms
- Pregnant - on abdominal palpation
- Pregnant - on history
- Pregnant - planned
- Pregnant - urine test confirms
- Pregnant - vaginal examination confirms
- Prenatal finding
- Previous pregnancies 10
- Previous pregnancies 2
- Previous pregnancies 8
- Previous pregnancies 9
- Previous pregnancies more than 10
- Questionable if pregnancy was planned
- Singleton pregnancy
- Surrogate pregnancy
- Third trimester pregnancy
- Third trimester pregnancy less than 36 weeks
- Undiagnosed pregnancy
- Vaginal liquor pad finding
- Vaginal pad finding
- Viable fetus
- Viable pregnancy
- Wanted pregnancy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z33.1: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Pregnancy NOS
- Pregnant state NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Notes
General instructions on how these codes are used.
- Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
- (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
- (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Z33.1, its category, or a range that includes it.
Excludes2 1
These codes carry an Excludes2 note naming Z33.1: its condition is not part of those codes, and both may be reported when the patient has both.
- Block Z00-Z13 Persons encountering health services for examinations
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Pregnancy (single) (uterine) See Also: Delivery and Puerperal; Z33.1
incidental finding Z33.1
incidental Z33.1
Status (post) See Also: Presence (of);
pregnancy, incidental Z33.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Pregnancy
You're going to have a baby! It's an exciting time, but it can also feel a bit overwhelming. You may have a lot of questions, including what you can do to give your baby a healthy start. Taking care of your health while you're pregnant will help your fetus develop into a healthy baby. To do that, it's important to:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Z33.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z33.1Overview
What is the ICD-10 code for pregnant state, incidental?
The ICD-10-CM code for pregnant state, incidental is Z33.1 (sometimes written as Z331). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Z33.1 (Pregnant state) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report pregnant state, incidental on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Z33.1 group to?
On inpatient claims, pregnant state, incidental maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.
Can Z33.1 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because pregnant state, incidental describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Who can Z33.1 be reported for?
The Medicare Code Editor checks pregnant state, incidental against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
