2027 ICD-10-CM Diagnosis Code O43.121Velamentous insertion of umbilical cord, first trimester
ICD-10-CM Codes›O00-O9A›O30-O48›O43
- Billable — Valid for Submission
- Not Chronic
O43.121 is a billable ICD-10-CM diagnosis code for velamentous insertion of umbilical cord, first trimester. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Maternal care related to disorders of the placenta and placental implantation.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O43.121.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to O43.121: its own notes plus those printed at O43 and Chapter 15. 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.
- supervision of normal pregnancy (Z34.-)
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.
Use Additional Code
Add a second code, after this one, to fully describe the condition.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Notes
General instructions on how these codes are used.
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Health Problems in Pregnancy
A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.
The full article covers:
- What are health problems in pregnancy?
- What raises my risk for health problems during pregnancy?
- Can chronic health conditions cause problems in pregnancy?
- Can health problems in pregnancy be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O43.121 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O43.121Overview
What is the ICD-10 code for velamentous insertion of umbilical cord, first trimester?
The ICD-10-CM code for velamentous insertion of umbilical cord, first trimester is O43.121 (sometimes written as O43121). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is O43.121 (Velamentous insertion of umbilical cord) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report velamentous insertion of umbilical cord, first trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does O43.121 group to?
When velamentous insertion of umbilical cord, first trimester is the principal diagnosis on an inpatient stay, it groups to MS-DRG 833, 832, 831, 819, 818, 817, with relative weights from 0.5000 to 1.7586 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O43.121 be reported for?
The Medicare Code Editor checks velamentous insertion of umbilical cord, first trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
What is the ICD-9 equivalent of O43.121?
Under the General Equivalence Mappings, velamentous insertion of umbilical cord, first trimester converts to ICD-9-CM 663.81 (cord complicat NEC-deliv). The mapping is approximate, so confirm the match fits the documentation.
