2027 ICD-10-CM Diagnosis Code Z03.73Encounter for suspected fetal anomaly ruled out

ICD-10-CM Codes›Z00–Z99›Z00-Z13›Z03

ICD-10-CM Z03.73
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z03.73 is a billable ICD-10-CM diagnosis code for encounter for suspected fetal anomaly ruled out. 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), not accepted as a principal diagnosis, and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders).

Code Identity

ICD-10-CM Code
Z03.73
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for suspected fetal anomaly ruled out
Short Description
Encounter for suspected fetal anomaly ruled out
Same as the full description in the CMS dataset.
Parent Code
Z03.7
Encounter for suspected maternal and fetal conditions ruled out

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ00-Z13Persons encountering health services for examinations
CategoryZ03Encounter for medical observation for suspected diseases and conditions ruled out
This CodeZ03.73Encounter for suspected fetal anomaly ruled out

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z03.73.

Maternity diagnoses
The Medicare Code Editor detects inconsistencies in maternity cases by checking a patient's age and any diagnosis on the patient's record. The maternity code edits apply to patients age ange is 9–64 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).
Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z03.73 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons encountering health services for examinations (Z00-Z13).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z03.73: its own notes plus those printed at Z03.7, Z03, block Z00-Z13, and Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Z03.7 Encounter for suspected maternal and fetal conditions ruled out applies to 6 codes
From Z03 Encounter for medical observation for suspected diseases and conditions ruled out applies to 14 codes
  • contact with and (suspected) exposures hazardous to health (Z77.-)
  • encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out (Z05.-)
  • person with feared complaint in whom no diagnosis is made (Z71.1)
  • signs or symptoms under study- code to signs or symptoms

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block Z00-Z13 Persons encountering health services for examinations applies to 156 codes
  • examinations related to pregnancy and reproduction (Z30-Z36, Z39.-)

Notes

General instructions on how these codes are used.

From Block Z00-Z13 Persons encountering health services for examinations applies to 156 codes
  • Nonspecific abnormal findings disclosed at the time of these examinations are classified to categories R70-R94.
From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • 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 Z03.73, its category, or a range that includes it.

Excludes1 7

These codes carry an Excludes1 note naming Z03.73: they are not reported together with it, unless the two conditions are unrelated.

  • O35 Maternal care for known or suspected fetal abnormality and damage
    encounter for suspected maternal and fetal conditions ruled out (Z03.7-) names Z03.7-, which includes this code
  • O36 Maternal care for other fetal problems
    encounter for suspected maternal and fetal conditions ruled out (Z03.7-) names Z03.7-, which includes this code
  • O40 Polyhydramnios
    encounter for suspected maternal and fetal conditions ruled out (Z03.7-) names Z03.7-, which includes this code
  • O41 Other disorders of amniotic fluid and membranes
    encounter for suspected maternal and fetal conditions ruled out (Z03.7-) names Z03.7-, which includes this code
  • Z01 Encounter for other special examination without complaint, suspected or reported diagnosis
    encounter for examination for suspected conditions, proven not to exist (Z03.-) names Z03.-, which includes this code
  • Z36 Encounter for antenatal screening of mother
    encounter for suspected maternal and fetal conditions ruled out (Z03.7-) names Z03.7-, which includes this code
  • Z71.1 Person with feared health complaint in whom no diagnosis is made
    medical observation for suspected diseases and conditions proven not to exist (Z03.-) names Z03.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC003
Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders)
Default principal diagnosis: inpatient No · outpatient Yes

Convert Z03.73 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V89.03 Sus fetal anomaly nt fnd
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z03.73Overview

What is the ICD-10 code for encounter for suspected fetal anomaly ruled out?

The ICD-10-CM code for encounter for suspected fetal anomaly ruled out is Z03.73 (sometimes written as Z0373). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z03.73 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for suspected fetal anomaly ruled out on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z03.73 group to?

On inpatient claims, encounter for suspected fetal anomaly ruled out 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 Z03.73 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for suspected fetal anomaly ruled out describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Who can Z03.73 be reported for?

The Medicare Code Editor checks encounter for suspected fetal anomaly ruled out against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.