2027 ICD-10-CM Diagnosis Code O9A.311Physical abuse complicating pregnancy, first trimester

ICD-10-CM Codes›O00-O9A›O94-O9A›O9A

ICD-10-CM O9A.311
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O9A.311 is a billable ICD-10-CM diagnosis code for physical abuse complicating pregnancy, 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 Maltreatment/abuse and Other specified complications in pregnancy.

Code Identity

ICD-10-CM Code
O9A.311
Billable Status
Yes — Valid for Submission
Code Describes
Physical abuse complicating pregnancy, first trimester
Short Description
Physical abuse complicating pregnancy, first trimester
Same as the full description in the CMS dataset.
Parent Code
O9A.31
Physical abuse complicating pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO94-O9AOther obstetric conditions, not elsewhere classified
CategoryO9AMaternal malignant neoplasms, traumatic injuries and abuse classifiable elsewhere but complicating pregnancy, childbirth and the puerperium
This CodeO9A.311Physical abuse complicating pregnancy, first trimester

Code EditsBilling

Medicare Code Editor checks that affect claim validity for O9A.311.

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).

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O9A.311: its own notes plus those printed at O9A.3 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.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

From O9A.3 Physical abuse complicating pregnancy, childbirth and the puerperium applies to 6 codes
  • sexual abuse complicating pregnancy, childbirth and the puerperium (O9A.4)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From O9A.3 Physical abuse complicating pregnancy, childbirth and the puerperium applies to 6 codes
  • code (if applicable):
  • to identify any associated current injury due to physical abuse
  • to identify the perpetrator of abuse (Y07.-)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • 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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O9A.311, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming O9A.311: they are not reported together with it, unless the two conditions are unrelated.

  • T74 Adult and child abuse, neglect and other maltreatment, confirmed
    abuse and maltreatment in pregnancy (O9A.3-, O9A.4-, O9A.5-) names O9A.3-, which includes this code
  • T76 Adult and child abuse, neglect and other maltreatment, suspected
    suspected abuse and maltreatment in pregnancy (O9A.3-, O9A.4-, O9A.5-) names O9A.3-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming O9A.311: its condition is not part of those codes, and both may be reported when the patient has both.

  • O9A.2 Injury, poisoning and certain other consequences of external causes complicating pregnancy, childbirth and the puerperium
    physical, sexual and psychological abuse complicating pregnancy, childbirth and the puerperium (O9A.3-, O9A.4-, O9A.5-) names O9A.3-, which includes this code

Clinical ClassificationClinical

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

CCSR INJ032
Maltreatment/abuse
Default principal diagnosis: inpatient No · outpatient No
CCSR PRG028
Other specified complications in pregnancy
Default principal diagnosis: inpatient Yes · outpatient Yes

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 O9A.311 to ICD-9-CMHistory

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

ICD-9-CM
648.91 Oth curr cond-delivered
Approximate The match is approximate rather than exact.
ICD-9-CM
648.93 Oth curr cond-antepartum
Approximate The match is approximate rather than exact.

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 O9A.311Overview

What is the ICD-10 code for physical abuse complicating pregnancy, first trimester?

The ICD-10-CM code for physical abuse complicating pregnancy, first trimester is O9A.311 (sometimes written as O9A311). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is O9A.311 (Physical abuse complicating pregnancy) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report physical abuse complicating pregnancy, first trimester on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does O9A.311 group to?

When physical abuse complicating pregnancy, 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 O9A.311 be reported for?

The Medicare Code Editor checks physical abuse complicating pregnancy, first trimester against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.

Does O9A.311 need an additional code?

When the condition applies, yes. The Use Additional Code note at O9A.3, which applies to O9A.311, reads: code (if applicable): to identify any associated current injury due to physical abuse; to identify the perpetrator of abuse (Y07.-). The additional code is reported after O9A.311.