ICD-10 Diagnosis Code O16.9

Unspecified maternal hypertension, unspecified trimester

Diagnosis Code O16.9

ICD-10: O16.9
Short Description: Unspecified maternal hypertension, unspecified trimester
Long Description: Unspecified maternal hypertension, unspecified trimester
This is the 2017 version of the ICD-10-CM diagnosis code O16.9

Code Classification
  • Pregnancy, childbirth and the puerperium
    • Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16)
      • Unspecified maternal hypertension (O16)

Information for Medical Professionals

Code Edits
The following edits are applicable to this code:
Maternity diagnoses Additional informationCallout TooltipMaternity diagnoses
Maternity. Age range is 12–55 years inclusive (e.g., diabetes in pregnancy, antepartum pulmonary complication).

Diagnoses for females only Additional informationCallout TooltipDiagnoses for females only
Diagnoses for females only.

Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Chronic hypertension complicating AND/OR reason for care during pregnancy
  • Chronic hypertension in obstetric context
  • Hypertension AND/OR vomiting complicating pregnancy childbirth AND/OR puerperium
  • Hypertension complicating pregnancy, childbirth and the puerperium
  • Hypertension complicating pregnancy, childbirth and the puerperium, antepartum

Replaced Code Additional informationCallout TooltipReplaced Code
The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2016. This codes was replaced for the FY 2017 (October 1, 2016-September 30, 2017).

This code was replaced in the 2017 ICD-10 code set with the code(s) listed below.
  • O16.4 - Unspecified maternal hypertension, complicating childbirth
  • O16.5 - Unspecified maternal hypertension, comp the puerperium

Information for Patients

High Blood Pressure in Pregnancy

If you are pregnant, high blood pressure can cause problems for you and your unborn baby. You may have had high blood pressure before you got pregnant. Or you may get it once you are pregnant - a condition called gestational hypertension. Either one can cause low birth weight or premature delivery of the baby.

Controlling your blood pressure during pregnancy and getting regular prenatal care are important for the health of you and your baby. Treatments for high blood pressure in pregnancy may include close monitoring of the baby, lifestyle changes, and certain medicines.

Some pregnant women with high blood pressure develop preeclampsia. It's a sudden increase in blood pressure after the 20th week of pregnancy. It can be life-threatening for both you and the unborn baby. There is no proven way to prevent it. Most women who have signs of preeclampsia are closely monitored to lessen or avoid complications. The only way to "cure" preeclampsia is to deliver the baby.

NIH: National Heart, Lung, and Blood Institute

  • Eclampsia
  • HELLP syndrome
  • Preeclampsia
  • Preeclampsia - self-care

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